Class / Patent application number | Description | Number of patent applications / Date published |
381940700 | Using signal channel and noise channel | 24 |
20080240465 | SOUND REPRODUCING DEVICE AND SOUND REPRODUCTION METHOD - A sound reproducing device is provided including a communication unit that transmits/receives signals; at least one sound output unit that outputs sound based upon a signal having been received, a sound pickup unit that picks up sound and generates audio data, an echo canceller unit that stores any echo signal contained in the signal having been received at the communication unit and generates a dummy echo signal by using the stored echo signal, and a noise reducing unit that generates a cancel signal to be used to cancel noise by using the audio data if the sound picked up at the sound pickup unit contains noise originating from a noise source and outputs a composite signal generated by combining the output signal from the echo canceller unit and the cancel signal. | 10-02-2008 |
20080279394 | Noise suppressing apparatus and method for noise suppression
- A common component extraction unit extracts a component Mi(n) included commonly in the plural input channels. A non-common component extraction unit extracts a component Si(n) not common to the plural input channels. A common component noise suppression unit obtains signal Mo(n) by executing a noise suppression process for the component Mi(n). A non-common component processing unit obtains signal So(n) by executing attenuation or emphasis for the component Si(n). A plural-channel generation unit removes noise of the common component from signals In(n, k) of the plural input channels, by using the signals Mo(n) and So(n) such that the non-common component is attenuated or emphasized. | 11-13-2008 |
20090022336 | SYSTEMS, METHODS, AND APPARATUS FOR SIGNAL SEPARATION - Methods, apparatus, and systems for source separation include a converged plurality of coefficient values that is based on each of a plurality of M-channel signals. Each of the plurality of M-channel signals is based on signals produced by M transducers in response to at least one information source and at least one interference source. In some examples, the converged plurality of coefficient values is used to filter an M-channel signal to produce an information output signal and an interference output signal. | 01-22-2009 |
20090129610 | Method and apparatus for canceling noise from mixed sound - A method, medium, and apparatus canceling noise from a mixed sound. The method includes receiving sound source signals including a target sound and noise, extracting at least one feature vector indicating an attribute difference between the sound source signals from the sound source signals, calculating a suppression coefficient considering ratios of noise to the sound source signals based on the at least one extracted feature vector, and canceling the sound source signals corresponding to noise by controlling an intensity of an output signal generated from the sound source signals according to the calculated suppression coefficient. Accordingly, a clear target sound source signal can be obtained. | 05-21-2009 |
20090147969 | PLAYBACK DEVICE, PLAYBACK METHOD AND PLAYBACK SYSTEM - A playback device includes: a playback portion that plays back content and outputs at least an audio signal; an acquisition portion that acquires an external audio signal; a generating portion that, based on noise collected by a sound collecting device, generates a noise cancellation signal to reduce the noise; a switching portion that, if the acquisition portion has acquired the external audio signal when the playback portion is playing back content, switches an output signal from the audio signal to the external audio signal; and a synthesizing portion that synthesizes the output signal from the switching portion with the noise cancellation signal. | 06-11-2009 |
20090154728 | SOUND COLLECTION APPARATUS - A sound collection apparatus according to the present invention comprises: at least one target sound collection means for collecting a sound including a target sound generated from a target sound source, so as to output a collected-sound signal; a plurality of non-target sound collection means, provided at positions different from each other, each forming a dead zone of a sensitivity in a direction of the target sound source so as to collect a sound outside the dead zone and output a collected-sound signal; sensitivity suppression means for generating a sensitivity suppression signal for suppressing a sound collection sensitivity in an overlap region in which a plurality of the dead zones overlap each other, as compared to in a region surrounding the overlap region, by subjecting, to a predetermined signal processing, the collected-sound signal outputted by each of the plurality of non-target sound collection means; and extraction means for removing, from the collected-sound signal outputted by the at least one target sound collection means, the sensitivity suppression signal generated by the sensitivity suppression means, so as to extract a signal of a sound generated in the overlap region in which the plurality of the dead zones overlap each other. | 06-18-2009 |
20090220107 | System and method for providing single microphone noise suppression fallback - Systems and methods for providing single microphone noise suppression fallback are provided. In exemplary embodiments, primary and secondary acoustic signals are received. A single microphone noise estimate may be generated based on the primary acoustic signal, while a dual microphone noise estimate may be generated based on the primary and secondary acoustic signals. A combined noise estimate based on the single and dual microphone noise estimates is then determined. Using the combined noise estimate, a gain mask may be generated and applied to the primary acoustic signal to generate a noise suppressed signal. Subsequently, the noise suppressed signal may be output. | 09-03-2009 |
20090274320 | NOISE CANCELING APPARATUS AND NOISE CANCELING METHOD - Disclosed herein is a noise canceling apparatus including: a microphone configured to pick up ambient sound as noise; a first signal generator configured to receive a signal from the microphone to generate a noise cancel signal that is inverted in phase to the signal received from the microphone and has an amplitude level considered with an attenuation in accordance with a distance from the microphone to an observation point separated away from the microphone; a first loudspeaker configured to be arranged in the proximity of the microphone and output the noise cancel signal; a second signal generator configured to receive the signal from the microphone to generate a positive-phase signal that has the same phase as that of the signal from the microphone; and a second loudspeaker configured to be arranged in the proximity of the microphone and output the positive-phase signal. | 11-05-2009 |
20100098266 | MULTI-CHANNEL AUDIO DEVICE - An audio signal enhancement device is provided. The device includes a first and a second microphone, placed as close together as possible, the first and second microphone having receiving surfaces facing in opposing directions. The first and second microphones receive a desired target audio signal originating in the proximity of the microphones and undesired noise signals not originating in the proximity of the microphones. The acoustic pressure gradient from the desired target signal between the first and the second microphones is greater than that from the noise signals. Signal processing logic is provided. The signal processing logic is configured to firstly generate a proximity-indicator signal and a pre-target-estimate signal through a combination of output from the first microphone and output of the second microphone. The signal processing logic is further configured to generate a noise-estimate signal by combining the output from the first microphone with the proximity-indicator and the pre-target-estimate. The signal processing logic is further configured to generate a target-estimate signal by combining the output from the first microphone with the proximity-indicator and the noise-estimate. The signal processing logic is further configured to provide a target signal substantially free from noise by combining the target-estimate, noise-estimate and the proximity-indicator. The embodiments also provide for a noise to signal ratio estimator that provides an indication to a user of the strength of the noise in the signal for a particular location. | 04-22-2010 |
20100158271 | METHOD FOR SEPARATING SOURCE SIGNALS AND APPARATUS THEREOF - A method for separating a sound source from a mixed signal, includes Transforming a mixed signal to channel signals in frequency domain; and grouping several frequency bands for each channel signal to form frequency clusters. Further, the method for separating the sound source from the mixed signal includes separating the frequency clusters by applying a blind source separation to signals in frequency domain for each frequency cluster; and integrating the spectrums of the separated signal to restore the sound source in a time domain wherein each of the separated signals expresses one sound source. | 06-24-2010 |
20100296668 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR AUTOMATIC CONTROL OF ACTIVE NOISE CANCELLATION - Active noise cancellation is combined with spectrum modification of a reproduced audio signal to enhance intelligibility. | 11-25-2010 |
20100303257 | Preserving Noise During Editing Of A Signal - Techniques for introducing background noise segments into signal data are provided. The background noise segments are constructed from a background noise print extracted from the signal data. The background noise print may be user specified, or automatically identified by the signal editing tool. The background noise print may be stored with, and subsequently loaded as part of, the project associated with a signal. The background noise segments that are generated based on the background noise print may have different durations than the background noise print itself. | 12-02-2010 |
20110026736 | AUDIO-SEPARATING APPARATUS AND OPERATION METHOD THEREOF - This present invention discloses an audio-separating apparatus and operation method thereof. The audio-separating apparatus applies both blind source separation and noise reduction mechanisms. The audio-separating apparatus only uses one microphone to record mixed sound signals. After applying the noise reduction mechanism, noise reduced signals and the mixed sound signals are used as the inputs of the blind source separation. The method may avoid the spatial aliasing effect caused by using a microphone array to record the mixed sound signals. Besides, speech segment losses caused by processing the noise reduction will be effectively recovered, which may help the hearing impaired recognize target speech signals. | 02-03-2011 |
20120057723 | Signal Processing Apparatus and Method - A signal processing apparatus includes a first audio output unit configured to output audio of a first audio signal input from a first signal input line, a first pickup unit connected to the first signal input line, a second audio output unit configured to output audio of a second audio signal input from a second signal input line, a second pickup unit connected to the second signal input line, a connecting line that connects the above units to ground, and a first reducing unit configured to at least reduce a first sound leakage signal, being the first audio signal leaking into the second signal input line from the first audio output unit, by using the first audio signal, or reducing a second sound leakage signal, being the second audio signal leaking into the second signal input line from the second audio output unit, by using the second audio signal. | 03-08-2012 |
20120093341 | APPARATUS AND METHOD FOR SEPARATING SOUND SOURCE - Disclosed are an apparatus and a method for separating sound sources capable of learning distributions of corresponding sound sources based on the assumption that specific sound sources have specific distributions based on interchannel correlation parameter in audio signals providing space perception through a plurality of channels to separate an amount corresponding to energy contribution of the corresponding sound sources from mixture signals. Exemplary embodiments of the present invention can more precisely predict the channel distributions of the specific sound sources included in the input mixture signals and more accurately separate sound sources than a method for separating a sound source based on the channel according to the related art, under conditions that general channel distribution information of the specific sound sources are approximately modeled. | 04-19-2012 |
20120177223 | MULTI-INPUT NOISE SUPPRESSION DEVICE, MULTI-INPUT NOISE SUPPRESSION METHOD, PROGRAM, AND INTEGRATED CIRCUIT - A power spectrum estimation unit ( | 07-12-2012 |
20120263317 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER READABLE MEDIA FOR EQUALIZATION - Enhancement of audio quality (e.g., speech intelligibility) in a noisy environment, based on subband gain control using information from a noise reference, is described. | 10-18-2012 |
20130016854 | MICROPHONE ARRAY PROCESSING SYSTEM - An audio system is provided that employs time-frequency analysis and/or synthesis techniques for processing audio obtained from a microphone array. These time-frequency analysis/synthesis techniques can be more robust, provide better spatial resolution, and have less computational complexity than existing adaptive filter implementations. The time-frequency techniques can be implemented for dual microphone arrays or for microphone arrays having more than two microphones. Many different time-frequency techniques may be used in the audio system. As one example, the Gabor transform may be used to analyze time and frequency components of audio signals obtained from the microphone array. | 01-17-2013 |
20140079245 | WIND NOISE REDUCING CIRCUIT - A high-pass filter is configured to remove a low-pass filter component of a first channel audio signal and a low-pass filter component of a second channel audio signal. A control unit is configured to detect a wind noise magnitude based on at least one from among the first channel audio signal and the second channel audio signal, and to increase a cutoff frequency of the high-pass filter according to an increase in the wind noise magnitude thus detected. The control unit is configured to set the cutoff frequency of the high-pass filter to a predetermined minimum value f | 03-20-2014 |
20140126746 | SIGNAL-SEPARATION SYSTEM USING A DIRECTIONAL MICROPHONE ARRAY AND METHOD FOR PROVIDING SAME - A signal separation system using directional microphone array and a method for providing same. The signal separation system using directional microphone array includes a signal receiving section which receives a mixed signal in which a first audio signal and a second audio signal are mixed using the directional microphone array, the directional microphone array including at least one first microphone oriented in a first direction and at least one second microphone oriented in a direction different from the first direction, and receives a reference signal through the at least one second microphone. An audio signal separating section cancels the second audio signal from the mixed signal received by the signal receiving section, based on the reference signal inputted through the at least one second microphone. | 05-08-2014 |
20140177868 | AUDIO PROCESSING DEVICE COMPRISING ARTIFACT REDUCTION - An audio processing device comprises a forward path comprising an input unit for delivering a time varying electric input signal representing an audio signal, the electric input signal comprising a target signal part and a noise signal part, a signal processing unit for processing said electric input signal and providing a processed signal, and an output unit for delivering an output signal based on said processed signal. An audio processing device comprises an analysis path comprising a model unit comprising a perceptive model of the human auditory system and providing an audibility measure, an artifact identification unit for identifying an artifact introduced into the processed signal by the processing algorithm and providing an artifact identification measure, and a gain control unit for controlling a gain applied to a signal of the forward path. | 06-26-2014 |
20140286505 | VEHICULAR ACTIVE VIBRATIONAL NOISE CONTROL APPARATUS - A vehicular active vibrational noise control apparatus includes an amplitude limiter for limiting the amplitude of a canceling signal based on a signal level of an audio signal, and a vehicle speed detector for detecting the vehicle speed of a vehicle, which incorporates therein the vehicular active vibrational noise control apparatus. The amplitude limiter changes an amplitude limitation rule, which represents a relationship of a limiting value for the amplitude of the canceling signal to the signal level, depending on the vehicle speed, and limits the amplitude of the canceling signal based on the limiting value determined according to the amplitude limitation rule. | 09-25-2014 |
20160049161 | SPEECH PROCESSING APPARATUS, SPEECH PROCESSING METHOD, SPEECH PROCESSING PROGRAM, METHOD OF ATTACHING SPEECH PROCESSING APPARATUS, CEILING MEMBER, AND VEHICLE - To input the voice of the passenger of a vehicle and output a piece of high-quality enhanced speech independently of the direction of a piece of speech or noise, a speech processing apparatus includes a first microphone that is provided on one of a ceiling member in a vehicle and an accessary thereof, inputs a sound mixture including a voice of a passenger of the vehicle and noise in the vehicle, and outputs a first signal, a second microphone that is provided on one of the ceiling member in the vehicle and the accessary thereof at a position farther than the first microphone when viewed from the passenger of the vehicle, inputs the noise in the vehicle while insulating the voice of the passenger of the vehicle using one of the ceiling member of the vehicle and the accessory thereof, and outputs a second signal, and a noise suppressor that outputs an enhanced speech signal based on the first signal and the second signal. | 02-18-2016 |
20160112817 | HEAD WEARABLE ACOUSTIC SYSTEM WITH NOISE CANCELING MICROPHONE GEOMETRY APPARATUSES AND METHODS - Systems and methods are described to extract desired audio from an apparatus to be worn on a user's head. The apparatus includes a head wearable device. A first microphone is coupled to the head wearable device, and is positioned on the head wearable device to receive a voice signal from the user when the head wearable device is on the user's head. A first signal from the first microphone is to be input as a main channel to a noise cancellation unit. A second microphone is coupled to the head wearable device. A first acoustic distance between the first microphone and the user's mouth is less than a second acoustic distance between the second microphone and the user's mouth when the head wearable device is on the user's head. A second signal from the second microphone is to be input as a reference channel to the noise cancellation unit. A first signal-to-noise ratio of the first signal from the first microphone is larger than a second signal-to-noise ratio of the second signal from the second microphone. | 04-21-2016 |