Entries |
Document | Title | Date |
20080205662 | Vehicle sound (s) enhancing accessory and method - An audio system and method for enhancing sounds coming from the exhaust from an internal combustion engine of an operating vehicle, and optionally from other components of the vehicle including the engine compartment, into the passenger compartment of the vehicle, by using one or more microphones located close to one or more components and processing the signal(s) and sending them directly or indirectly to at least one speaker located in the passenger compartment or to at least one set of headphones is disclosed. | 08-28-2008 |
20080240455 | ACTIVE NOISE CONTROL APPARATUS - A subtractor subtracts an echo canceling signal (Ĉ·y | 10-02-2008 |
20080240456 | ACTIVE NOISE CONTROL APPARATUS - A control characteristics changing unit reads, from an EEPROM, various control parameters in an ANC electronic controller, which correspond to specification information acquired from ECUs. The control characteristics changing unit then outputs control parameters, depending on changed specification information among the read control parameters, as change signals Sm | 10-02-2008 |
20080240457 | ACTIVE NOISE CONTROL APPARATUS - A subtractor subtracts an echo canceling signal Ĉ·yl(n−1) from a canceling error signal e(n) to estimate a residual noise to be silenced at the position of a microphone, and outputs a first basic signal x | 10-02-2008 |
20080260174 | Noise reduction apparatus and audio reproduction apparatus - A noise reduction apparatus includes: a speaker with a speaker unit held by holding means to make it possible to mix sounds emitted from front and rear of a vibration plate of the speaker; a microphone provided in an area where the sounds emitted from the front and rear of the vibration plate of the speaker are mixed and cancelled; and means for supplying a noise reduction audio signal obtained by phase-inverting an audio signal collected by the microphone to the speaker. | 10-23-2008 |
20080292110 | VEHICULAR ACTIVE NOISE CONTROL SYSTEM - A frequency detecting circuit estimates the frequency fp of a propeller shaft based on the frequency fc of vehicle speed pulses, and calculates a control frequency fp′ which is a harmonic of the frequency fp. A basic signal generator generates a basic cosine wave signal xp | 11-27-2008 |
20080317254 | NOISE CONTROL DEVICE - A noise control device according to the present invention comprises: four or more noise detectors each for detecting a plurality of noises arriving thereat, and outputting the noises as a noise signal; a control speaker for radiating, to a control point, a control sound based on each noise signal; and a filter section for signal-processing noise signals from the noise detectors by using filter coefficients which respectively correspond to the four or more noise detectors and which are set such that the control sound from the control speaker reduces the plurality of noises arriving at the control point, and for adding up all the signal-processed noise signals, and for outputting a resultant signal to the control speaker. The control point and the control speaker are provided within a polyhedral-shaped space whose apexes are placement positions of the noise detectors. | 12-25-2008 |
20090022333 | IN-VEHICLE COMMUNICATION SYSTEM - An in-vehicle communication system includes a control unit which locates coupling points of each one of active speaker units to in-vehicle network. The plurality of the active speaker units includes a plurality of acoustic characteristics set data and programs for determining their own addresses. The respective active speaker units thus can be coupled to in-vehicle network without changing their software, and acoustic characteristics values in response to their coupling points in the vehicle can be established. | 01-22-2009 |
20090034747 | AUDIO ENHANCEMENT SYSTEM AND METHOD - A system and method for enhancing the sound signal produced by an audio system in a listening environment by compensating for ambient sound in the listening environment, comprises producing an audio sound in the time domain from an electrical sound signal in the time domain. The electrical sound signal in the time domain is transformed into an electrical sound signal in the frequency domain and the electrical sound signal in the frequency domain is retransformed into an audio sound in the time domain. The total sound level in the environment is measured and a signal representative thereof is generated. The audio sound signal and the total sound signal are processed to extract a signal representing the ambient sound level within the environment, and equalization is performed in the frequency domain to adjust the output from the audio sound signal to compensate for the ambient noise level. | 02-05-2009 |
20090060217 | VEHICULAR ACTIVE VIBRATORY NOISE CONTROL APPARATUS - A vehicular active vibratory noise control apparatus includes an adaptive notch filter (second control signal generating unit) for generating a corrected error signal representative of a road noise only by removing the component of a rotational frequency (the component of an engine muffled sound) from an error signal, generates a first control signal from the corrected error signal and a reference signal, and reduces the component of the rotational frequency (engine muffled sound) at a position where a microphone is located (evaluating point). | 03-05-2009 |
20090067638 | VEHICULAR ACTIVE VIBRATORY NOISE CONTROL APPARATUS - A subtractor subtracts a first control signal output from a first bandpass filter from an error signal, and supplies a differential signal to a second bandpass filter. The second bandpass filter, which has a central frequency of 70 Hz, is affected by an operation of the first bandpass filter, i.e., a first control signal, which has a central frequency of 40 Hz. The first bandpass filter is not affected by an operation of the second bandpass filter, i.e., the second control signal. | 03-12-2009 |
20090074198 | ACTIVE VIBRATION NOISE CONTROLLER - Microphone is arranged at an evaluation point at the front seat; a signal for controlling vibration noise at this position is sent out from speaker at the front seat; secondary sound for canceling an influence of secondary sound at the front seat on the rear seat is sent out from speaker at the rear seat; microphone is arranged at an evaluation point at the rear seat; a signal for controlling vibration noise at this position is sent out from speaker; and secondary sound for canceling an influence of secondary sound at the rear seat on the front seat is sent out from speaker at the front seat. | 03-19-2009 |
20090097669 | Acoustic system for providing individual acoustic environment - An acoustic system uses a self speaker installed to be at the back of a listener in a first individual space and an error microphone installed to be closer to the listener than the self speaker. A sound-leakage reduction filter generates control sound for negating sound leaked from another speaker installed in a second individual space to the first individual space, and provides the control signal to the self speaker. A virtual sound-source filter generates a virtual sound source, and a rear-sound-source inverse filter corrects rearward localization of a sound image toward the listener. | 04-16-2009 |
20090136054 | Engine Sound Control Apparatus and Control Method - An engine sound control apparatus capable of arranging a sound of a frequency that is lower than the fundamental-order frequency of the engine. The engine sound control apparatus detects the frequency of the engine sound and generates a sound signal of a frequency that is in accordance with a control signal and outputting the sound signal generated by the oscillator. Through the interaction between the sound generated by the apparatus and the engine sound, occupants in the passenger compartment will perceive a sound of a frequency that is equal to the difference between the generated sound and the fundamental-order sound. This yields a sound that is lower in frequency than the fundamental-order sound without actually generating a sound of a frequency that is lower than that of the fundamental-order sound. | 05-28-2009 |
20090169028 | Sound Field Control Apparatus And Sound Field Control Method - In a sound field control apparatus including multiple speakers, multiple microphones gathering sound radiated from the multiple speakers, a mode decomposition filter that performs mode decomposition on a sound pressure distribution, and a control filter that controls the input signals to be input to the multiple speakers such that the mode amplitudes of the modes decomposed by the mode decomposition filter can have a predetermined value, a sound pressure distribution in the acoustic space is measured, and the sound pressure distribution in the acoustic space is expressed by using a sinusoidal function and cosine function of a space frequency of the mode to be controlled in amplitude. The mode space frequency is corrected such that the expressed sound pressure distribution can be equal to the measured sound pressure distribution, and the filter coefficient for the mode decomposition filter is determined based on the mode space frequency obtained by the correction (corrected mode space frequency). | 07-02-2009 |
20090202085 | Listening Device for Clear Perception of Sound Signals In a Noisy Environment - The invention concerns a listening device ( | 08-13-2009 |
20090208025 | ACTIVE NOISE REDUCTION SYSTEM - An electromechanical converter has independent electric input sections. The output of an active noise reduction controller is inputted into an electric input section and the audio signal from an audio section is inputted into an electric input section. These are mechanically combined at a vibration section and the combined signal is radiated as a sound wave into the space. With such a structure, both the active noise reduction function and the audio reproduction function are realized without installing a large device in an existing audio reproduction apparatus. | 08-20-2009 |
20090208026 | BAFFLE VIBRATION REDUCING - An apparatus for reducing baffle vibration includes a baffle that is subject to vibration. A first transducer that is seated in the baffle includes a first diaphragm that is acoustically coupled to a listening area in a vehicle and also acoustically coupled to a cavity in the vehicle. A first input signal applied to the first transducer causes the first diaphragm to move in a first direction, thereby generating an acoustic output. A second transducer is mechanically coupled to the first transducer. The second transducer includes a second diaphragm that is acoustically coupled to the first diaphragm and also acoustically coupled to the listening area. A second input signal applied to the second transducer causes the second diaphragm to move in a second direction that is substantially opposite to the first direction to reduce a vibration imparted to the baffle while substantially maintaining the acoustic output. | 08-20-2009 |
20090274316 | SYSTEM AND METHOD FOR COUNTERING NOISE WHEN OPERATING AN ADDRESS SYSTEM IN A PASSENGER TRANSPORT - A system for countering ambient noise when operating an address system in at least one compartment of a passenger transport unit includes: (a) a noise control unit; and (b) at least one memory unit coupled with the noise control unit. The at least one memory unit stores noise characteristic information relating with at least one operational condition of the transport unit. The noise control unit employs the noise characteristic information to effect the countering. | 11-05-2009 |
20090279710 | Active Noise Reducing Device - An active noise reducing device includes switchover frequency memory which stores a speaker having weaker influence of level drop or dips in gain characteristics of transmission from first speaker and second speaker both working as secondary noise generators to microphone working as a residual signal detector, and also stores a frequency band of that speaker. Output switcher appropriately and selectively switches first speaker over to second speaker in response to the noise frequency at present calculated based on the rpm of engine by frequency calculator. This structure allows the active noise reducing device to work steadily even if level drop or a dip occurs in the gain characteristics of transmission from the speaker to the microphone, and allows suppressing the occurrence of abnormal sound due to divergence or distorted sound due to excessive output. Ideal noise reduction effect can be expected. | 11-12-2009 |
20100014683 | NOISE REDUCTION DEVICE - A noise reduction device including a noise detection microphone including a high-frequency noise detection microphone and a low-frequency noise detection microphone for respectively detecting a high-frequency noise and a low-frequency noise generated from a noise source; a noise control unit for generating a control sound signal for cancelling a noise detected by the noise detection microphone in a control center of control space; and a loudspeaker for outputting a control sound based on the control sound signal from the noise controlling unit. The high-frequency noise microphone is disposed in a vicinity of a head portion of a user in a state in which directivity in an opposite direction with respect to the control center is added, and the low-frequency noise detection microphone is disposed outside of a sound-insulating wall. | 01-21-2010 |
20100054490 | Audio Noise Cancellation System - System including signal processor in communication with sound detector and with sound-emitting device. Sound detector and sound-emitting device are in audio communication with occupant compartment. Signal processor is configured for receiving input signal from sound detector being indicative of background audio noise in occupant compartment, and for causing sound-emitting device to emit output sound that partially cancels background audio noise in manner responsive to received input signal. Another system, including array of sound detectors and array of sound-emitting devices. Method includes providing signal processor in communication with sound detector and sound-emitting device, where sound detector and sound-emitting device are in communication with occupant compartment. Further in method, signal processor is caused to receive input signal from sound detector being indicative of background audio noise in occupant compartment. Additionally in method, signal processor is induced to cause sound-emitting device to emit output sound that partially cancels background audio noise in manner responsive to received input signal. | 03-04-2010 |
20100061562 | SHIELDED COMMUNICATION TRANSDUCER - A system and method for detecting a sound originating from a body and enhancing signal-to-noise ratio with respect to noise originated outside the body is disclosed. The system comprises a light source for producing a quasi-monochromatic, spatially-coherent light beam; and interferometer for interfering alight beam originated from the source, incident upon the body and reflected from it, with a reference beam, which also originates from the light source; and a detector for detecting changes caused by motion of a least one interference fringe across the detector, and for generation a corresponding electric signal. | 03-11-2010 |
20100061563 | ENTERTAINMENT SYSTEM AND EARPHONE - There is provided an entertainment system comprising at least one seat, an electronic unit ( | 03-11-2010 |
20100080399 | Method For Reducing Vehicle Noise - A method for reducing noise in a vehicle by reducing under certain conditions the rotational speed of certain rotational components. | 04-01-2010 |
20100111317 | NOISE REDUCTION DEVICE - A noise reduction device, including a microphone for detecting noise, a noise controller for reversing the phase of noise detected by the microphone based on information outputted from the microphone, and a speaker for outputting sound based on information outputted from the noise controller, is arranged at a seat surrounded by a shell portion having a cavity, wherein a speaker is disposed in the cavity of the shell portion. | 05-06-2010 |
20100124336 | SYSTEM FOR ACTIVE NOISE CONTROL WITH AUDIO SIGNAL COMPENSATION - An active noise control system generates an anti-noise signal to drive a speaker to produce sound waves to destructively interfere with an undesired sound in a targeted space. The speaker is also driven to produce sound waves representative of a desired audio signal. Sound waves are detected in the target space and a representative signal is generated. The representative signal is combined with an audio compensation signal to remove a signal component representative of the sound waves based on the desired audio signal and generate an error signal. The active noise control adjusts the anti-noise signal based on the error signal. The active noise control system converts the sample rates of an input signal representative of the undesired sound, the desired audio signal, and the error signal. The active noise control system converts the sample rate of the anti-noise signal. | 05-20-2010 |
20100266135 | VEHICLE INTERIOR ACTIVE NOISE CANCELLATION - A vehicle has an electric drive mode, a body defining a vehicle interior, a first and second set of audio speakers positioned outside and inside of the interior, respectively, and a controller. The controller generates an acoustic signal, broadcasts the acoustic signal via the first set of speakers during an electric drive mode, and generates and broadcasts a cancelling signal via the second set of speakers. The broadcasts are coordinated to substantially cancel an attenuated portion of the acoustic signal resulting from propagation of the acoustic signal into the interior. A method cancels a synthesized sound within a vehicle interior by collecting vehicle operating values, generating an acoustic signal as the synthesized sound during an electric drive mode, and processing the acoustic signal to generate a modified acoustic signal approximating an attenuated portion of the acoustic signal propagating into the vehicle interior. | 10-21-2010 |
20110026723 | ACTIVE VIBRATORY NOISE CONTROL APPARATUS - An active vibratory noise control apparatus includes a basic signal generator configured to output a basic sine wave signal and a basic cosine wave signal. An adaptive finite impulse response filter is configured to output a control signal to cancel the vibratory noise. A vibratory noise cancelling device is configured to generate vibratory-noise canceling sound. An error signal detector is configured to output an error signal. A reference signal generator is configured to output a reference signal and corrects the basic cosine wave signal and the basic sine wave signal based on correction values. A buffer is configured to accumulate a number of reference signals corresponding to a number of taps of the adaptive finite impulse response filter. A filter coefficient updating device is configured to sequentially update filter coefficients of the adaptive finite impulse response filter to minimize the error signal. | 02-03-2011 |
20110033059 | METHOD AND SYSTEM FOR REDUCING ECHO AND NOISE IN A VEHICLE PASSENGER COMPARTMENT ENVIRONMENT - An echo cancelling algorithm in a communication device initializes a step size value used in an adaptive echo filter based on a background noise signal power level relative to a power level of a received signal and a power level of an echo estimate relative to an output of an echo canceller. The algorithm then adjusts the step size value. One aspect adjusts the step size based on the detection of large fast fourier transform values at one, or more, disturbing-signal frequencies. Another aspect estimates residual echo energy to adjust an estimated echo energy, which then is used to set a double talk flag if a transmit signal has much more power than the estimated echo signal. Another aspect compares transmit signal power to a decimated version of the transmit signal power and sets the double talk flag if the former exceeds the latter by a predetermined amount. | 02-10-2011 |
20110064237 | METHOD AND APPARATUS FOR ACTIVE NOISE SHEDDING - A method for reducing audible noise in a vehicle audio component includes steps of: determining that the audio component is or is about to be operating in a susceptible mode wherein it is likely to receive electrical interference caused by an electrical component operating in an interfering operating state; communicating to the electrical component that the audio component is operating in the susceptible mode; and changing operation of the electrical component from the interfering operating state to a non-interfering operating state less likely to generate electrical signals causing audible noise. | 03-17-2011 |
20110142248 | ACTIVE NOISE CONTROL APPARATUS - An active noise control apparatus includes a road surface input detector, a reference signal generator, an adaptive filter, a noise-cancellation sound generator, an error detector, a reference signal corrector, a filter coefficient updating unit, a transfer characteristic variation detector, and an update amount controller. The transfer characteristic variation detector is configured to detect a variation in transfer characteristic between the road surface input detector and the error detector. The update amount controller is configured to increase an amount of updating of a filter coefficient to a value greater than a value that is used in a normal mode in accordance with the variation in transfer characteristic detected by the transfer characteristic variation detector. | 06-16-2011 |
20110206213 | ACTIVE TYPE ACOUSTIC CONTROL SYSTEM - In an acoustic control system an operation range of an active type noise control device (an ANC device) and an operation range of an active type effect sound control device (an ASC device) are exchanged in accordance with the number of working cylinders of an engine. | 08-25-2011 |
20110211708 | SIMULTANEOUS ENHANCEMENT OF TRANSMISSION LOSS AND ABSORPTION COEFFICIENT USING ACTIVATED CAVITIES - A method and apparatus for providing simultaneous enhancement of transmission loss and absorption coefficient using activated cavities is presented. A layer of material is provided, and a backing plate having a plurality of cavities on the top surface of said backing plate, is disposed adjacent a top surface of said layer of material. A screen is disposed along the top surface of said cavities on said backing plate and at least one cavity includes an actuator disposed within the cavity and a control system receiving a signal from the microphone and receiving a signal from the accelerometer and providing a drive signal to the actuator to provide an acoustic output to provide simultaneous insertion loss and absorption which serves to minimize a linear combination of the signal from the microphone and the signal from the accelerometer. | 09-01-2011 |
20110222699 | NOISE REDUCTION DEVICE AND NOISE REDUCTION SYSTEM - A noise reduction device is disclosed, in which noise reduction device, a controlling sound generator outputs a white noise generated by a white-noise generator, and this white noise is sensed by an error sensor for identifying an acoustic transmission function covering a path from the controlling sound generator to the error sensor. At this time, an identification controller prompts the white noise generator to generate a white noise for identifying the acoustic transmission function provided that an ambient noise level sensed by the error sensor is not greater than a given threshold. | 09-15-2011 |
20110255706 | Sound Generator - A sound generator is provided capable of generating vehicle sound that will be produced when a specific sound element is changed out of a plurality of sound elements arising from the operation of a plurality of components mounted on a vehicle. A sound generator | 10-20-2011 |
20110261970 | NOISE MODIFYING OVERHEAD AUDIO SYSTEM - An overhead audio system for use in a vehicle, the overhead audio system includes multiplexor for receiving an input signal from a plurality of audio sources and for transmitting an output signal; a noise detection sensor for detecting a noise and providing noise data; an audio processor for processing the output signal received from the multiplexor and for receiving the noise data from the noise detection sensor, wherein the audio processor processes the output signal based on the noise data and transmits the processed output signal to a speaker; and wherein the overhead audio system is housed within a headliner of the vehicle. | 10-27-2011 |
20120070012 | NOISE REDUCTION SYSTEM FOR AN ELECTRICALLY POERED AUTOMOTIVE VEHICLE - A noise reduction system for an automotive vehicle powered at least in part by an electric motor located separately from the passenger compartment. The system includes at least one sensor which produces an output signal having a frequency, amplitude and phase representative of noise generated by the electric motor. At least one speaker is positioned closely adjacent the electric motor. A speaker output controller receives the output from the sensor as an input signal and generates an output signal to the speaker so that the speaker produces an audible signal having substantially the same frequency and amplitude but inverted in phase relative to the output from the sensor. | 03-22-2012 |
20120070013 | METHOD AND DEVICE FOR NARROW-BAND NOISE SUPPRESSION IN A VEHICLE PASSENGER COMPARTMENT - A method and a device for suppressing noise in the passenger compartment of a vehicle, which include at least one transducer, a programmable computer, at least one acoustic sensor, the computer being configured such as to apply an electro-acoustic model of the passenger compartment to a correcting system model including a central controller with fixed coefficients joined to a block of variable coefficients, including a Youla parameter in the form of a Youla block Q. The first phase includes determining and calculating the electro-acoustic model and the control law for at least one predetermined noise frequency. In a second phase, in real time, the computer applies the control law to the electro-acoustic model in accordance with the current frequency of the noise to be suppressed. | 03-22-2012 |
20120076314 | AURAL SMOOTHING OF A VEHICLE - A method of controlling sounds associated with a vehicle is provided. The method includes: performing on a processor, monitoring engine torque; and selectively controlling the generation of one or more tones associated with the vehicle based on the engine torque. | 03-29-2012 |
20120076315 | Repetitive Transient Noise Removal - A system improves the perceptual quality of a speech signal by dampening undesired repetitive transient noises. The system includes a repetitive transient noise detector adapted to detect repetitive transient noise in a received signal. The received signal may include a harmonic and a noise spectrum. The system further includes a repetitive transient noise attenuator that substantially removes or dampens repetitive transient noises from the received signal. The method of dampening the repetitive transient noises includes modeling characteristics of repetitive transient noises; detecting characteristics in the received signal that correspond to the modeled characteristics of the repetitive transient noises; and substantially removing components of the repetitive transient noises from the received signal that correspond to some or all of the modeled characteristics of the repetitive transient noises. | 03-29-2012 |
20120189132 | ACTIVE VIBRATION NOISE CONTROL APPARATUS - An active vibration noise control apparatus uses an adaptive control process, which predicts rear road wheel noise canceling sounds by correcting a front road wheel reference signal or a rear road wheel reference signal with a corrective filter, based on different characteristics of front road wheel suspensions and rear road wheel suspensions. | 07-26-2012 |
20120195439 | ACTIVE VIBRATION NOISE CONTROL DEVICE - An active vibration noise control device is preferably used for cancelling a vibration noise by making a speaker generate a control sound. The active vibration noise control device includes a step-size parameter changing unit which changes a step-size parameter used for updating a filter coefficient. The step-size parameter changing unit calculates a parameter-for-change based on the filter coefficient updated by using a basic step-size parameter, and changes the basic step-size parameter by a minimum value in the previously calculated parameter-for-change. Therefore, it is possible to appropriately change the step-size parameter by using the minimum value of the parameter-for-change. Hence, it becomes possible to effectively suppress a divergence of an adaptive notch filter due to a secular change of the speaker. | 08-02-2012 |
20120201397 | Active Noise Reduction Adaptive Filter Leakage Adjusting - An active noise reduction system using adaptive filters. A method of operation the active noise reduction system includes smoothing a stream of leakage factors. The frequency of a noise reduction signal may be related to the engine speed of an engine associated with the system within which the active noise reduction system is operated. The engine speed signal may be a high latency signal and may be obtained by the active noise reduction system over audio entertainment circuitry. | 08-09-2012 |
20120230504 | NOISE-REDUCTION DEVICE - When cancelling noise by acoustically outputting, to a room interior, sound having a phase opposite to that of noise leaked into the room interior of a movable body, if detected movable body exterior sound is predetermined specific sound, a cancelling amount of a noise cancelling operation is automatically reduced. | 09-13-2012 |
20120257763 | Sound Modification System And Method - A sound modification system and a method of managing sound in a vehicle. The system includes an active noise reduction (ANR) controller, an engine sound enhancement (ESE) controller and a sound modification controller. When the vehicle is in a steady state driving condition, the sound modification controller activates the ANR controller and deactivates the ESE controller. In contrast, when the vehicle is in a non-steady state driving condition, the sound modification controller activates the ESE controller and deactivates the ANR controller. Preferably, when the vehicle switches between the steady state and non-steady state driving conditions, the sound modification controller activates and deactivates the ANR and ESE controllers at a rate that is not noticeable to a human. In summary, the system utilizes the ANR and ESE controllers to achieve an optimal passenger cabin experience for the driver during any driving condition. | 10-11-2012 |
20120269358 | ACTIVE SOUND CONTROL - An apparatus for controlling sound within a vehicle includes an acoustical damping device operable to determine a measured sound. The acoustical damping device is operable to output a noise canceling signal to a vehicle audio system to dampen the measured sound. A sound controller is operably coupled to the acoustical damping device and is configured to automatically receive an environment signal from an environment sensor. The sound controller is configured to determine an operating mode of the vehicle based on the environment signal. The operating mode is selectable from an operating mode list that includes a stress operating mode and a calm operating mode. The sound controller is configured to cause alteration of the noise canceling signal and reduction in damping in the stress operating mode with respect to the calm operating mode. | 10-25-2012 |
20120288110 | Device, System and Method of Noise Control - Some demonstrative embodiments include devices, systems and methods of noise control. For example, a device may include a controller to control noise within a predefined noise-control zone, the controller is to receive a plurality of noise inputs representing acoustic noise at a plurality of predefined noise sensing locations, which are defined with respect to the predefined noise-control zone, to receive a plurality of residual-noise inputs representing acoustic residual-noise at a plurality of predefined residual-noise sensing locations, which are located within the predefined noise-control zone, to determine a noise control pattern, based on the plurality of noise inputs and the plurality of residual-noise inputs, and to output the noise control pattern to at least one acoustic transducer. | 11-15-2012 |
20120300955 | ACTIVE VIBRATION NOISE CONTROL DEVICE - An active vibration noise control device cancels vibration noise by making plural speakers generate control sounds. The active vibration noise control device selects one or more speakers which output the control sounds, from plural speakers, based on a relationship between (1) a first phase difference which corresponds to a difference between phase characteristics of the vibration noise from a vibration noise source to an evaluation point and phase characteristics of the vibration noise from the vibration noise source to a pseudo evaluation point and (2) a second phase difference for each of the plural speakers corresponding to a difference between phase characteristics of the control sound from the speaker to the evaluation point and phase characteristics of the control sound from the speaker to the pseudo evaluation point. Therefore, it stably decreases the vibration noise at the pseudo evaluation point independently of a frequency band of the vibration noise. | 11-29-2012 |
20130010977 | RADIO RECEPTION DEVICE FOR VEHICLE AND NOISE CANCELLATION METHOD - A radio reception device for vehicle | 01-10-2013 |
20130044891 | ACTIVE VIBRATION NOISE CONTROL DEVICE - The disclosed active vibration noise control device is suitable for use in cancelling out vibration noise by outputting control noise from a plurality of speakers. When a vibration noise frequency is in a dip bandwidth, the active vibration noise control device alters the step size parameters used to update the filter coefficient at at least one filter coefficient update means from among a plurality of filter coefficient update means. Thus, the filter coefficient update speed can be retarded in unstable dip bandwidths, enabling loss in silencing effect which occurs during dip characteristics to be appropriately reduced. | 02-21-2013 |
20130136269 | ACTIVE VIBRATION NOISE CONTROL APPARATUS - An active vibration noise control apparatus cancels out vibration noise generated in the passenger compartment of a vehicle when the vehicle is traveling, by outputting canceling vibration noise. The active vibration noise control apparatus includes a frequency switcher. The frequency switcher calculates a phase angle change between a phase angle in a complex space of a filter coefficient of an adaptive notch filter and a previous phase angle calculated when the filter coefficient is updated previously, and changes a target frequency of a reference signal depending on the calculated phase angle change. | 05-30-2013 |
20130136270 | ACTIVE VIBRATION NOISE CONTROL APPARATUS - An active vibration noise control apparatus is provided. When a vehicle speed changes thereby to change frequency characteristics (peak-amplitude frequency) of vibration noise, the active vibration noise control apparatus refers to a vehicle speed versus frequency correspondence table representing a correspondence relation between a vehicle speed of a vehicle and a frequency of a reference signal, and changes the frequency of the reference signal that is used by an adaptive notch filter. | 05-30-2013 |
20130156213 | Virtual Audio System Tuning - A method of virtually tuning an audio system that incorporates an acoustic compensation system, where the audio system is adapted to play audio signals in a listening environment over one or more sound transducers. The acoustic compensation system has an audio sensor located at a sensor location in the listening environment. The transfer functions from each sound transducer to the audio sensor location are inherent. The method contemplates recording noise at the sensor location, and creating virtual transfer functions from each sound transducer to the sensor location based on the inherent transfer functions from each sound transducer to the sensor location. Audio signals are processed through the virtual sound transducer to sensor location transfer functions. A virtual sensor signal is created by combining the audio signals processed through the virtual sound transducer to sensor location transfer functions with the noise recorded at the sensor location. | 06-20-2013 |
20130163774 | NOISE REDUCTION APPARATUS - The noise reduction apparatus according to the present disclosure includes a plurality of loudspeakers, control sound signal generating units, and a plurality of error microphones. Each of the control sound signal generating units generates control sound signal based on the error sound detected by a corresponding error microphone of the plurality of error microphones. The noise reduction apparatus further including an input switching unit that, when a level of the noise at a predetermined position is higher than the predetermined threshold value, feeds an error audio signal at a predetermined control point of the plurality of control points or a control point that is newly set based on the plurality of control points into each of the control sound signal generating units, the number of the newly set control point being less than the number of the plurality of control points | 06-27-2013 |
20130208906 | NOISE REDUCTION DEVICE - A noise reduction device includes a noise controller, a control sound output component and a residual sound detector. The noise controller is configured to produce a control sound signal for canceling out noise. The control sound output component is configured to output a control sound based on the control sound signal produced by the noise controller. The residual sound detector is configured to detect a residual sound produced by superposition of noise and the control sound outputted from the control sound output component. The control sound output component and the residual sound detector are housed in the shell. The control sound output component and the residual sound detector are away from a rear face of the seat. | 08-15-2013 |
20130259249 | ACTIVE VIBRATION NOISE CONTROL APPARATUS - An ANC apparatus using so-called adaptive control is provided with a cancellation sound output means which outputs front wheel cancellation sound that cancels front wheel vibration noise due to front wheel vibration at a position to be silenced on the basis of a front wheel reference signal, and outputs rear wheel cancellation sound that cancels rear wheel vibration noise due to predicted rear wheel vibration at the position to be silenced on the basis of a rear wheel reference signal, and a turning state detection means which detects a turning state of a vehicle. When a difference in travel trajectory between a front wheel and a rear wheel is detected on the basis of the turning state, the cancellation sound output means suppresses the output of the rear wheel cancellation sound. | 10-03-2013 |
20140044274 | Estimating Direction of Arrival From Plural Microphones - A noise suppression system includes plural microphones, a fixed beam former, a blocking matrix, plural adaptive filters, and a direction of arrival circuit coupled to the adaptive filters that prevents the filters from adapting in the presence of a signal in the look direction. The direction of arrival circuit causes the filters to adapt more quickly in the absence of a signal in the look direction. A pair of adjustable gain circuits is coupled to each microphone. A first adjustable gain circuit from each pair is calibrated during the presence of a desired signal and a second adjustable gain circuit from each pair is calibrated during the presence of an interfering signal. A fixed null-forming circuit is coupled to a first pair of variable gain circuits and an adaptive null forming circuit is coupled to a second pair of adjustable gain circuits. The ratio of the gains of the null forming circuits is used as a control signal. Successive ratios are averaged with a variable smoothing constant and a control signal is derived from the averaged ratios. | 02-13-2014 |
20140112490 | METHOD AND AN ACTIVE DEVICE FOR TREATING NOISE ON BOARD A VEHICLE, AND A VEHICLE PROVIDED WITH SUCH A DEVICE - A noise treatment device (D) comprising at least one local noise sound sensor ( | 04-24-2014 |
20140169578 | DEVICE FOR INFLUENCING PASSENGER COMPARTMENT NOISE - A device is provided for influencing the passenger compartment noise in a motor vehicle includes, but is not limited to a noise signal generator for generating an offsetting noise signal, which includes, but is not limited to a control input for receiving a control signal that is representative of the engine load of the motor vehicle, and a loudspeaker for receiving the offsetting noise signal and emitting an offsetting noise into the passenger compartment of the motor vehicle. The noise signal generator furthermore includes, but is not limited to an input for a temperature signal of a temperature sensor and is equipped to generate the offsetting noise signal as a function of a signaled temperature. | 06-19-2014 |
20140192993 | REVERBERATION SUPPRESSION DEVICE - A reverberation suppression device comprises: an echo canceller that removes an echo component included in an input signal; a howling suppressor that detects occurrence of howling based on a frequency characteristic of the input signal from which the echo component has been removed and attenuates a frequency level of a component of the detected howling; and an initial sound suppressor that detects a sound section of the input signal in which the frequency level of the howling component has been attenuated and suppresses a signal value at a sound start portion of the detected sound section. | 07-10-2014 |
20140233748 | Forward Speaker Noise Cancellation In a Vehicle - Systems and methods to cancel noise in a vehicle are disclosed. A first speaker is positioned forward of a steering wheel of a vehicle. The first speaker generates a first signal configured to acoustically cancel noise produced by operation of the vehicle. A second speaker is positioned forward of the steering wheel. The second speaker generates a second signal to acoustically cancel the noise produced by the operation of the vehicle. The first and the second speakers are capable of generating the first and the second signals independently of one another. | 08-21-2014 |
20140254815 | PEDESTRIAN ALERT SYSTEM FOR A MOTOR VEHICLE - A pedestrian alert system includes, a noise producing member having a primary acoustic output surface configured and disposed to direct noise from the noise producing member along a first axis, and at least one secondary acoustic output surface that allows noise to pass from the noise producing member along a second axis that is distinct from the first axis. An acoustic focusing member is provided about the noise producing member. The acoustic focusing member is configured and disposed to re-direct noise from the second axis toward the first axis. | 09-11-2014 |
20140270220 | AIRCRAFT PREDICTIVE ACTIVE NOISE CANCELLATION - An improved user experience is provided for passengers of a transportation vessel, such as an airplane. A passenger's experience is enhanced by allowing the passenger to enjoy media provided by an entertainment device without ambient noise. When the passenger requests accesses to a media item through the entertainment device, a microphone in the entertainment system generates an ambient noise signal based on captured ambient noise. A noise cancellation device generates a predictive noise cancelling signal based on the ambient noise signal. To generate the predictive noise cancelling signal, the noise cancellation device inverts the ambient noise signal and applies a predictive phase shift to the signal based on an estimated distance between the microphone and the passenger's ears. The noise cancelling signal is mixed with audio of the media item. | 09-18-2014 |
20140286500 | ACTIVE VIBRATION NOISE SUPPRESSION APPARATUS - Provided is an active vibration noise suppression apparatus having good robustness without determining a secondary transfer function while not performing adaptive control. A first control unit generates a control signal by a first adaptive algorithm as a direct adaptive algorithm. A storing unit stores an equivalent value Gh of a secondary transfer function G which is adaptively updated as an adaptive filter by the first control unit. A second control unit uses a second adaptive algorithm which uses the equivalent value Gh of the secondary transfer function G stored in the storing unit as a feedforward coefficient and updates a filter coefficient C2 of the control signal as an adaptive filter based on the feedforward coefficient. The second control unit generates the control signal by the second adaptive algorithm when the first control unit does not generate the control signal. | 09-25-2014 |
20140294189 | Motor Vehicle Adaptive Feed-Forward Noise Reduction - A system, device and method that is configured to operate an active noise reduction system for a motor vehicle, where there is an adaptive feed-forward noise reduction system input sine wave at a frequency to be cancelled, and where the adaptive feed-forward noise reduction system includes an adaptive filter that outputs noise reduction signals that are used to drive one or more transducers with their outputs directed to reduce engine noise, and further includes an input transducer with an output signal that is a source of a control signal for the adaptive filter. The output signal of the input transducer is filtered before it reaches the adaptive filter so as to reduce the level of the output signal of the input transducer at one or more frequencies that are close to the frequency of the input sine wave. | 10-02-2014 |
20140294190 | METHOD AND DEVICE FOR DAMPING OR AMPLIFYING A SOUND INTRODUCED INTO A PASSENGER COMPARTMENT OF A MOTOR VEHICLE - The invention relates to a method ( | 10-02-2014 |
20140321659 | SYSTEM FOR INFLUENCING EXHAUST NOISE, ENGINE NOISE AND/OR INTAKE NOISE | 10-30-2014 |
20140334633 | SOUND GENERATOR FOR AN ANTI-NOISE SYSTEM FOR INFLUENCING EXHAUST NOISES AND/OR INTAKE NOISES OF A MOTOR VEHICLE - A sound generator for influencing sound waves propagating in exhaust or intake systems of combustion engine driven vehicles includes: an enclosure having a port opening for communication with an exhaust and/or intake system; a loudspeaker basket supported by the enclosure; a membrane and a permanent magnet supported by the loudspeaker basket; and a voice coil supported by a voice coil carrier. The voice coil is disposed in a constant magnetic field created by the permanent magnet and is connected to the membrane. The membrane is located between the port opening and the permanent magnet. The membrane is funnel-like or dome-like, with the top or top face of the funnel-like membrane or the geometric center of the dome-like membrane facing away from the permanent magnet. An anti-noise system using the sound generator, and a vehicle using the anti-noise system are also provided. | 11-13-2014 |
20140348338 | ACTIVE NOISE CANCELLATION - Provided is an active noise cancellation apparatus capable of reliably reducing road noise by reducing vibration of a vehicle component part which generates road noise by using a vibration generator. A plurality of reference signal detectors are placed respectively on right and left knuckles for respectively supporting right and left wheels. A vibration generator and an error signal detector are placed on a vehicle component part. A controller performs respective adaptive controls based on each of reference signals and an error signal so as to reduce the error signal, and controls the vibration generator based on a sum of respective output values of the adaptive controls. | 11-27-2014 |
20140376733 | SYSTEM FOR INFLUENCING EXHAUST NOISE IN A MULTI-FLOW EXHAUST SYSTEM - An anti-noise system for influencing exhaust noises propagating through a multi-flow exhaust system includes a controller | 12-25-2014 |
20150010162 | SYSTEMS AND METHODS FOR OPTIMIZING AN AUDIO COMMUNICATION SYSTEM - Methods and systems for optimizing and audio communication system, including detecting a surrounding noise profile, determining one or more states of one or more noise-related conditions corresponding to the surrounding noise profile, and associating the one or more states of the one or more noise-related conditions to the surrounding noise profile. | 01-08-2015 |
20150010163 | Active Reduction of Harmonic Noise from Multiple Noise Sources - A system and method for reducing harmonic noise caused by two or more noise sources by causing one or more loudspeakers to produce sounds that are at about the same frequencies as the noise and of substantially opposite phase. There is a noise canceller associated with each noise source. Each noise canceller includes a harmonic sine wave generator that generates an output sine wave. Each noise canceller also has an adaptive filter that uses a sine wave to create a noise reduction signal that is used to drive one or more transducers with their outputs directed to reduce noise caused by the noise sources. There is an overlap detector that compares the harmonic frequencies and, based on their proximity, alters the operation of one or more adaptive filters. | 01-08-2015 |
20150016623 | ACTIVE NOISE CANCELLATION METHOD FOR ENCLOSED CABINS - A Noise Cancellation Process for enclosed cabins is disclosed. According to one embodiment, an input audio source corresponding to sound received from multiple microphones situated equidistantly in both directions in a two dimensional plane, is converted to a digital signal via an analog to digital (A/D) convertor. The A/D converted audio is analyzed for content to identify ambient noise. The frequency, amplitude and phase of the identified ambient noise is subsequently determined. A Noise correction sound wave is generated with negative phase of that corresponding to the identified ambient noise. The noise correction sound wave is added to the identified noise to create a noise corrected sound. | 01-15-2015 |
20150063582 | Engine Harmonic Cancellation System Afterglow Mitigation - A device and method that is configured to operate an active noise reduction system for a motor vehicle, where there is an active noise reduction system input signal that is related to the vehicle engine speed, and where the active noise reduction system comprises one or more adaptive filters that use a filter coefficient to modify the amplitude and/or phase of a noise cancellation reference signal and output noise reduction signals that are used to drive one or more transducers with their outputs directed to reduce engine noise, where the value of the coefficient is related to an adaptive filter leakage factor. Changes in the engine speed, based on the input signal that is related to the vehicle engine operation, are monitored. In response to changes in the engine speed, the adaptive filter leakage factor is temporarily modified. | 03-05-2015 |
20150104030 | ACTIVE-NOISE-REDUCTION DEVICE, AND ACTIVE-NOISE-REDUCTION SYSTEM, MOBILE DEVICE AND ACTIVE-NOISE-REDUCTION METHOD WHICH USE SAME - A reference signal generating unit of an active-noise-reduction device of the present invention outputs a referencing signal having a correlation with a vibration to an adaptive filter unit. A filter coefficient update unit receives an input of an error signal, and successively updates a filter coefficient of the adaptive filter unit. The error signal is generated by a cancelling sound based on the output of the adaptive filter unit and noise. The detection unit detects a filter coefficient of the filter coefficient update unit, and determines a size of the output of the adaptive filter unit. Then, the amplitude of the cancelling sound is adjusted based on the size of the output of the adaptive filter unit estimated by the detection unit. | 04-16-2015 |
20150110285 | MODIFYING AN AUDIO PANORAMA TO INDICATE THE PRESENCE OF DANGER OR OTHER EVENTS OF INTEREST - A personal safety system detects imminent danger or other event of interest and then modifies a sound panorama to focus a user's attention towards the direction of the danger or other event of interest. The personal safety system may isolate sounds originating from the direction of the danger or other event of interest, collapse the sound panorama towards the direction of the danger or other event of interest, or compress the sound panorama to align with the direction of the danger or other event of interest. The personal safety system may be integrated into an automobile or a wearable system physically attached to the user. Advantageously, the attention of the user may be drawn towards imminent danger or other events of interest without introducing additional sensory information to the user, thereby reducing the likelihood of startling or distracting the user. | 04-23-2015 |
20150124988 | COTALKER NULLING BASED ON MULTI SUPER DIRECTIONAL BEAMFORMER - Speech from a driver and speech from a passenger in a vehicle is selected directionally using a plurality of directional microphones. Sounds detected as coming from a passenger from a plurality of directional microphones are suppressed from sounds detected as coming from a driver by a second plurality of directional microphones. | 05-07-2015 |
20150124989 | SYSTEM FOR CONTROLLING VEHICLE INTERIOR SOUND USING SMART PHONE AND METHOD THEREOF - A system for controlling vehicle interior sound using a smart phone and a method thereof include a driving information provider to provide driving information while a vehicle is being driven. A smart phone includes a microphone which senses interior noise or sound of the vehicle and generates a sound control signal to diminish or amplify the interior noise based on the driving information from the driving information provider. An audio amplifier amplifies the sound control signal received from the smart phone and outputs an amplified signal though a speaker. | 05-07-2015 |
20150334490 | ACTIVE NOISE REDUCTION ENGINE SPEED DETERMINING - An active noise reduction system using adaptive filters. A method of operation the active noise reduction system includes smoothing a stream of leakage factors. The frequency of a noise reduction signal may be related to the engine speed of an engine associated with the system within which the active noise reduction system is operated. The engine speed signal may be a high latency signal and may be obtained by the active noise reduction system over audio entertainment circuitry. | 11-19-2015 |
20150350776 | SOUND AUGMENTATION SYSTEM TRANSFER FUNCTION CALIBRATION - A vehicle system is provided that includes a sound augmentation system with a sound augmentation generator that produces an augmented audio output to drive at least one audio output based on a transfer function. The vehicle system also includes a sound augmentation system health monitor that determines a current performance level of the sound augmentation system based on at least one audio input and a feedback of the augmented audio output, and triggers a transfer function update prompt based on a difference between the current performance level and an expected performance level being at a threshold level. A user interface outputs the transfer function update prompt and receives a transfer function calibration request in response to the transfer function update prompt. A transfer function calibration module drives a calibration sequence on at least one audio output and monitors at least one audio input to determine an updated transfer function. | 12-03-2015 |
20150356963 | VEHICLE AUDIO SYSTEM AND NOISE REMOVAL METHOD THEREOF - A vehicle audio system includes: a tune knob configured to select a frequency of a desired radio broadcast; a microcomputer configured to detect a broadcast frequency input through the tune knob and to determine an optimal sampling frequency of a full digital amplifier based on the detected broadcast frequency; a tuner configured to receive only a broadcast signal corresponding to the frequency selected through the tune knob; and the full digital amplifier configured to generate a digital signal by sampling the broadcast signal received by the tuner at the optimal sampling frequency determined by the microcomputer and to amplify and output the generated digital signal. | 12-10-2015 |
20150356965 | ACTIVE NOISE REDUCTION DEVICE, INSTRUMENT USING SAME, AND ACTIVE NOISE REDUCTION METHOD - In an active noise reduction device, in order to solve this problem, a control block determines a level of a reference signal detected by a level detection unit. If determining that the level of the reference signal is small, the control block decreases a level of a cancel signal. This operation suppresses generation of an abnormal sound even if a level of a noise is small. | 12-10-2015 |
20150358727 | ACTIVE BUFFETING CONTROL IN AN AUTOMOBILE - An active buffeting noise control arrangement for a vehicle having one or more window panels of a vehicle cabin. One or more actuators are positioned at or near the one or more window panels and are operable to selectively vibrate the one or more windows in order to generate sound waves that will counteract a low frequency throb or buffeting event. The arrangement further includes one or more sensors in a vehicle cabin for detecting the buffeting event in transmitting sensor data to a control module. The control module is connected to the one or more sensors as well as the one or more actuators where the control module receives the sensory data, determines if a buffeting event is occurring and commands the one or more actuator assemblies to vibrate the window and generate sound waves that are operable to counteract the buffeting event. | 12-10-2015 |
20160012814 | Motor Vehicle Noise Management | 01-14-2016 |
20160019880 | APPARATUS AND METHOD FOR CANCELLING, REDUCING AND MODULATING NOISE SIGNAL AND FOR SIGNAL ENHANCING AND SIGNAL PROOFING - The embodiments herein provide an apparatus and method for cancelling signal noise. According to one embodiment, an apparatus for cancelling signal noise has a sensor or receiver to capture the undesirable signals. A transducer converts the energy of the captured signals and modulates the captured undesirable signals. A signal inverting circuit is connected to the transducer to generate the inverse of the captured undesirable signals by inverting the amplitude of the undesirable signal while maintain the frequency at the same level. The generated inverse of the undesirable signal transmitted by a transmitter is received by a receiver and output through a speaker so that the output inverse of the undesirable signal is combined with the undesirable signal to produce a desired signal environment. | 01-21-2016 |
20160027428 | NOISE CANCELLATION SYSTEM - Active noise cancellation may be provided by a variety of systems, methods and techniques. General aspects, for example, include an active noise cancellation system, a controller for an active noise cancellation system, and/or a method of generating an anti-noise signal. In one example aspect, an active noise cancellation system for an aircraft In-flight entertainment system may include at least one input device, a processing means, and an output. The input device may be associated with a seat on the aircraft and adapted to receive an input representative of an ambient noise in the vicinity of the seat. The processing means may be adapted to process the input to produce an output signal adapted to reduce the ambient noise in volume associated with the seat. The output may be adapted to transmit an output signal to at least one driver, which is adapted to transmit the output signal to a user. | 01-28-2016 |
20160029111 | VEHICLE IN CABIN SOUND PROCESSING SYSTEM - A sound system of a vehicle includes a plurality of microphones disposed in a cabin of the vehicle, a plurality of speakers disposed in the cabin of the vehicle, and a sound processor operable to process microphone output signals of the microphones to determine a voice signal of a speaking occupant in the vehicle at or near one of the microphones. The sound processor generates a processor output signal that is provided to at least some of the speakers. Responsive to the processor output signal, the at least some of the speakers generate sound representative of the voice signal of the speaking occupant to direct the sound towards other occupants in the vehicle, while one or more speakers at or near the seat occupied by the speaking occupant do not generate sound representative of the voice signal of the speaking occupant. | 01-28-2016 |
20160029119 | METHOD FOR CONTROLLING AN EXTENDED-RANGE ELECTRIC VEHICLE INCLUDING AN ELECTRONIC SOUND ENHANCEMENT SYSTEM - A method for controlling an extended-range electric vehicle including an internal combustion engine and an electronic sound enhancement system includes selecting a preferred engine order equalization, said preferred engine order equalization achieving a desired engine sound in a passenger compartment of the vehicle responsive to an operator input to an accelerator pedal and decoupled from actual engine operation responsive to a state of charge (SOC) of a propulsion battery. Sound is generated in the passenger compartment by the electronic sound enhancement system responsive to the preferred engine order equalization. | 01-28-2016 |
20160035341 | SYSTEM AND METHOD OF MICROPHONE PLACEMENT FOR NOISE ATTENUATION - A method and system for attenuating noise comprises identifying a location in an area at which sound emitted from one or more speakers has acoustic characteristics that are substantially similar in measure to corresponding acoustic characteristics of the emitted sound at a location approximated to be near an ear of an occupant of the area. A microphone, which may be a virtual microphone, is disposed at the identified location. The microphone detects sound at the identified location. In response to the sound detected by the microphone, the one or more speakers emit a noise-canceling audio signal adapted to attenuate one or more frequencies in the sound detected by the microphone. | 02-04-2016 |
20160042731 | SYSTEM AND METHOD FOR CONTROLLING VEHICLE NOISE - A noise control system and a method are provided. The method includes receiving, by a controller, a reference signal in response to a noise and an error signal that corresponds to residual noise. A control signal is generated for cancelling the noise based on the reference signal. In addition, the controller outputs a vibration according to the control signal to generate a cancellation signal for cancelling the noise. A phase delay of the reference signal is compensated for by the controller and updates a filter value of the adaptive filter based on the reference signal passing through the path compensation filter and the error signal. | 02-11-2016 |
20160086592 | ADAPTIVE ACTIVE NOISE CANCELLATION - A number of variations may include a method including obtaining data indicating a driver intent from a vehicle and using an ANC system to cancel noise in an appropriately reactive manner. | 03-24-2016 |
20160086593 | ACTIVE NOISE CONTROL APPARATUS FOR VEHICLE - An active noise control apparatus for a vehicle including: a plurality of microphones each configured to receive noise generated in the vehicle and generate an electrical signal corresponding to the noise; an external amplifier configured to supply power required for operations of the plurality of microphones; and a head unit configured to control the external amplifier to output a signal for removing the noise, based on the electrical signals generated from the plurality of microphones. | 03-24-2016 |
20160093283 | NOISE CONTROLLER AND NOISE CONTROL METHOD FOR REDUCING NOISE FROM OUTSIDE OF SPACE - A noise controller includes a first control unit that outputs a control signal for outputting sound for reducing noise to a first speaker, a first characteristic circuit that generates a signal by performing convolution, using a transfer characteristic from the second speaker to a second sound collector, on a control signal output from the first control unit to a second speaker, a subtractor that subtracts the signal generated by the first characteristic circuit from an output signal of a second sound collector and outputs a resultant signal. The first control unit generates the control signal to be output to the first speaker while the output signal from the subtractor serves as a reference signal so that an output signal of the first sound collector is minimized, and outputs the control signal to the first speaker. | 03-31-2016 |
20160118037 | APPARATUS FOR OUTPUTTING PROTECTING SOUND IN QUIETING VEHICLE - An apparatus and method for outputting a protecting sound in a quieting vehicle is provided. The apparatus includes a storage unit that is configured to store a mapping table in which protecting sounds having frequency bands that are exponentially increased for each vehicle speed are mapped. In addition, a controller is configured to output the protecting sound of the frequency band that corresponds to the current vehicle speed using the mapping table when the vehicle is being driven by an electric motor. | 04-28-2016 |
20160125865 | SUPPRESSING SUDDEN CABIN NOISE DURING HANDS-FREE AUDIO MICROPHONE USE IN A VEHICLE - A vehicle audio quality system for suppressing sudden vehicle cabin noise is provided, as well as methods of using the system. The system includes: an arrangement of heterogeneous microphones and a noise cancelation module (NCM). The microphone arrangement includes: a first microphone and a plurality of secondary microphones. The NCM includes a controller and a non-transitory computer-readable medium for storing application software executable by the controller to improve the quality of desired cabin audio received by the first microphone, the software performing the steps of: receiving a desired audio input from the first microphone; receiving supplemental audio input via the plurality of secondary microphones that includes a sudden cabin noise input; and applying a suppression procedure to the sudden cabin noise input. | 05-05-2016 |
20160125868 | Electrified Vehicle Noise Cancellation - Systems, apparatus and methods for cancelling a noise voltage at a vehicle are presented. An noise cancellation system (NCS) can be configured to null an earth-to-body voltage at the vehicle to prevent its interference with a receiver system. An (NCS) can include a noise sensor (NSSR) configured to sense a noise voltage, and a noise-nulling device (NNDV) configured to provide an anti-noise output. An anti-noise injector (ANI) can be configured to drive the anti-noise output at an anti-noise injection site In an example embodiment, an anti-noise output can be provided directly to the receiver system by cable. Alternatively, an anti-noise signal can be inductively or capacitively coupled to a vehicle structure or component that is not part of the receiver system. A noise cancellation system can be arranged in a feedback or feed-forward arrangement. Radio frequency noise and non-radio frequency noise can be cancelled. | 05-05-2016 |
20160127827 | SYSTEMS AND METHODS FOR SELECTING AUDIO FILTERING SCHEMES - Methods and apparatus are provided for filtering sound in a vehicle. The methods includes generating a microphone signal corresponding to sounds in the passenger compartment. The methods also include receiving an audio-based service being utilized by at least one occupant. A sound separation mode is selected from the plurality of sound separation modes. Each sound separation mode corresponds to a different audio filtering scheme. The method also includes filtering the input received by the microphone in accordance with the selected sound separation mode to generate at least one filtered signal. | 05-05-2016 |
20160133244 | SYSTEMS AND METHODS FOR CONTROLLING NOISE IN A VEHICLE - Methods and apparatus are provided for controlling noise in a compartment. The audio system includes an error microphone configured to receive sounds and generate an error signal corresponding to the received sounds. A processor in communication with the error microphone is configured receive the error signal from the error microphone and generate a noise-canceling signal based at least in part on the error signal and an acoustic transfer function. The audio system also includes a loudspeaker in communication with the processor to receive the noise-canceling signal and produce a noise-canceling sound wave based on the noise-canceling signal. The processor is also configured to receive at least one audio signal different from the error signal and to modify the acoustic transfer function utilizing the at least one audio signal. | 05-12-2016 |
20160134968 | VEHICLE MULTIMEDIA SYSTEM AND METHOD - A vehicle multimedia system able to provide for optimal performance in the vehicle in which it is installed includes a microphone, a signal processing module, a multimedia control module, an audio output device, and a video control signal. The microphone records environmental noise inside a vehicle. The signal processing module receives the environmental noise signal and makes a noise cancellation signal. The multimedia control module receives a video signal, an audio signal, and the noise cancellation signal. The audio signal is combined with the noise cancellation signal to produce a clean audio signal. The multimedia control module outputs the clean audio signal to one or more audio output devices and outputs the video signal video to one or more video output devices. | 05-12-2016 |
20160150313 | Actively Suspended Seat with Bass Loudspeakers - A system for a seat in a motor vehicle that has a cabin audio system and a bass loudspeaker that is able to generate sound in the cabin. The system includes a seat active suspension system with a vibration sensor coupled to the seat, and a controller that is responsive to the vibration sensor and that outputs control signals that are provided to an electromagnetic actuator that reduces seat vibrations. The active suspension system is arranged such that it can cause a change in the audio system. | 05-26-2016 |
20160163304 | Subband Algorithm With Threshold For Robust Broadband Active Noise Control System - An active noise control (ANC) system includes a speaker and one or more processors. The one or more processors implement an adaptive subband filtered reference control algorithm that applies thresholds to reference and error feedback signal paths such that, in response to a series of broadband non-Gaussian impulsive reference signals indicative of road noise in the vehicle having an audible frequency range of 20 Hz to 20 kHz, weight coefficients defining an adaptive filter of the control algorithm converge and permit the ANC system to partially cancel the road noise via output of the speaker. | 06-09-2016 |
20160163305 | Variable Bandwidth Delayless Subband Algorithm For Broadband Active Noise Control System - An active noise control (ANC) system includes a speaker and one or more processors programmed to implement a delayless subband filtered-x least mean square control algorithm. The algorithm includes a variable bandwidth discrete Fourier transform filter bank having a number of subbands such that the system, in response to a broadband white noise reference signal indicative of road noise in the vehicle, exhibits a uniform gain spectrum across a frequency range defined by the subbands and partially cancels the road noise via output of the speaker. | 06-09-2016 |
20160379618 | ARRAYING SPEAKERS FOR A UNIFORM DRIVER FIELD - A method and system for a noise cancellation comprises an amplifier in communication with the three or more speakers disposed in an area. A system controller produces a driver signal for each of the speakers in response to a signal from at least one microphone detecting sound in the area and communicates the driver signals to the amplifier. The amplifier drives each speaker with the driver signal produced for that speaker. In response to the driver signals, the speakers emit sound that combined produces a substantially uniform sound pressure field for a particular zone within the area. The substantially uniform sound pressure field produced by the speakers has a magnitude and phase adapted to attenuate a noise field in the area corresponding to the sound detected by the at least one microphone. | 12-29-2016 |
20160379620 | SYSTEM AND METHOD OF MICROPHONE PLACEMENT FOR NOISE ATTENUATION - A method and system for attenuating noise comprises identifying a location in an area at which sound emitted from one or more speakers has acoustic characteristics that are substantially similar in measure to corresponding acoustic characteristics of the emitted sound at a location approximated to be near an ear of an occupant of the area. A microphone, which may be a virtual microphone, is disposed at the identified location. The microphone detects sound at the identified location. In response to the sound detected by the microphone, the one or more speakers emit a noise-canceling audio signal adapted to attenuate one or more frequencies in the sound detected by the microphone. | 12-29-2016 |
20160379621 | USING EXTERNAL SOUNDS TO ALERT VEHICLE OCCUPANTS OF EXTERNAL EVENTS AND MASK IN-CAR CONVERSATIONS - An audio processing system may selectively identify certain environmental sounds and playing back these sounds, or a representation of these sounds, in the vehicle's cabin. The audio processing system may filter the environmental sounds to identify a particular sound that matches an event such as a bouncing ball, squealing tires, footsteps, and the like. The audio processing system may then provide an audio alert to an occupant in the vehicle. For example, the system may process the identified sound (e.g., amplify and/or isolate the sound) and use a speaker to output the processed sound into the interior of the vehicle. In another embodiment, the audio processing system may use environmental sounds as an audio masking sound for creating privacy zones within the vehicle. The audio processing system may filter the environmental sounds to identify a continuous sound which is then output to generate the privacy zones. | 12-29-2016 |