Class / Patent application number | Description | Number of patent applications / Date published |
367124000 | By combining or comparing signals | 42 |
20080219100 | Systems and Methods Related to Identifying and/or Locating Weapon Fire Incidents - A system and method for detecting, identifying, and fixing the location of the source of an acoustic event. The inventive system includes: a plurality of sensors dispersed at somewhat regular intervals throughout a monitored area; a communication network adapted to deliver information from the sensors to a host processor; and a process within the host processor for determining, from the absolute times of arrival of an event at two or more sensors, a position of the source of the event. Acoustic events are detected and analyzed at each sensor so that the sensor transmits over the network: an identifier for the sensor; an identifier for the type of event; and a precise absolute time of arrival of the event at the sensor. In a preferred embodiment, the system also identifies the type of weapon firing a gunshot. | 09-11-2008 |
20090201765 | SYSTEM AND METHOD FOR POSITION DETERMINATION OF OBJECTS - A method and a system for detection and position determination of chips, which transmit ultrasound signals in a room. The system comprises electronic identification chips, which are attached to objects that have to be monitored. Each chip is equipped with a transmitter and a receiver. The signals are received by a plurality of detector units, which are connected to a detector base unit that registers and interprets the signals transmitted form the identification chips. Detector base units located in different rooms are interconnected in a network and transmit processed information to one or more central units for further interpretation and sorting. The special feature of the invention is that line interference is substantially removed, and it is possible to determine position even though the identification chips are in motion. | 08-13-2009 |
20090219785 | METHOD AND SYSTEM FOR DETERMINING THE LOCATION AND/OR SPEED OF AT LEAST ONE SWIMMER - Method for determining the location and/or speed of at least one swimmer, swimming through water, comprising: —sending acoustic signals through the water, using stationary acoustic transmitter means (AT) having a stationary position, or using mobile acoustic transmitter means (AT′) being carried by said swimmer (S); —receiving the acoustic signals using mobile acoustic receiver means (AR) being carried by said swimmer (S), or using stationary acoustic receiver means (AR′) respectively; —determining the time difference between the time of sending and the time of receiving each acoustic signal; —determining a location and/or speed of said swimmer (S) with respect to said stationary transmitter means (AT) or stationary receiver means (AR′), using said time differences and a predetermined propagation speed of the acoustic signal through the water. | 09-03-2009 |
20090316529 | Positioning of a Portable Electronic Device - An acoustical positioning system for positioning a portable electronic device including a loudspeaker system including three or more loudspeakers and a control unit operable according to a first time reference wherein the control unit controls the transmission of a series of audio beacons from the loudspeakers, wherein a first beacon is transmitted at a first time of the first time reference from a first speaker, a second beacon is transmitted at a second time of the first time reference from a second speaker, and a third beacon is transmitted at a third time of the first time reference from a third speaker; at least one portable electronic device operable according to a second time reference and including a synchronizer for synchronising the second time reference to the first time reference; a microphone for receiving the transmitted series of audio beacons; a detector for detecting the time according to the second time reference at which an audio beacon is received and for identifying the origin of the received audio beacon, wherein the first beacon is received at a fourth time according to the second time reference, the second beacon is received at a fifth time according to the second time reference, and the third beacon is received at a sixth time according to the second time reference; and a unit for determining a position of the portable device using relative positions of the first, second and third speakers and the difference between the first time and the fourth time, between the second time and the fifth time, and between the third time and the sixth time. | 12-24-2009 |
20100085838 | SYSTEM AND METHOD FOR POSITIONING - A system for small space positioning comprises a transmitting device, movable within an approximate range, configured for transmitting a modulated continuous wave, wherein the modulated continuous wave includes a carrier signal and a base-band signal, and a receiving unit configured for receiving signal (s) transmitted by the transmitting device and for determining a position of the transmitting device within the approximate range based on analysis of both the carrier signal and the base-band signal received from the transmitting device. | 04-08-2010 |
20100110834 | APPARATUS AND METHOD OF DETECTING TARGET SOUND - An apparatus and method of voice activity detection (VAD) are disclosed. To detect a target sound, a target sound detecting apparatus calculates the phase difference corresponding to each frequency component from a plurality of sound signals converted in frequency domain, calculates a characteristic value indicating possibility that the phase difference of the frequency component is within an allowable phase difference range of target sound calculated based on a direction angle of the target sound, and detects the presence and/or absence of target sound using the characteristic value. | 05-06-2010 |
20100135118 | METHOD OF AND SYSTEM FOR DETERMINING DISTANCES BETWEEN LOUDSPEAKERS - The invention describes a method of determining the distance (d | 06-03-2010 |
20100142327 | JOINT POSITION-PITCH ESTIMATION OF ACOUSTIC SOURCES FOR THEIR TRACKING AND SEPARATION - The invention relates to a method for localizing and tracking acoustic sources ( | 06-10-2010 |
20100271905 | WEAPON IDENTIFICATION USING ACOUSTIC SIGNATURES ACROSS VARYING CAPTURE CONDITIONS - A computer implemented method for automatically detecting and classifying acoustic signatures across a set of recording conditions is disclosed. A first acoustic signature is received. The first acoustic signature is projected into a space of a minimal set of exemplars of acoustic signature types derived from a larger set of exemplars using a wrapper method. At least one vector distance is calculated between the projected acoustic signature and each exemplar of the minimal set of exemplars. An exemplar is selected from the minimal set of exemplars having the smallest vector distance to the projected acoustic signature as a class corresponding to and classifying the first acoustic signature. The first acoustic signature and the plurality of acoustic signatures may correspond to one of gunshots, musical instruments, songs, and speech. The minimal set of exemplars may correspond to a hierarchy of acoustic signature types. | 10-28-2010 |
20100284250 | ACOUSTIC STEERING FOR BOREHOLE PLACEMENT - Apparatus ( | 11-11-2010 |
20110116345 | POSITION DETECTION SYSTEM, TRANSMISSION DEVICE, RECEPTION DEVICE, POSITION DETECTION METHOD AND POSITION DETECTION PROGRAM - To enable precise calculation of a propagation time of a direct wave which arrives the earliest from an ultrasonic emission source without being affected by a reflected wave. A plurality of ultrasonic signals generated based on a plurality of M sequences different from each other are propagated from a transmission side to a reception side, whereby the reception side executes processing of correlation between each model waveform of the plurality of M sequences and a waveform of each ultrasonic signal and detects a subsidiary peak of a correlation value appearing when both waveforms partly coincide with each other to, starting with the smallest one of subsidiary peaks detected by all the correlation processing, determine a plurality of corresponding M sequences. The transmission side selects an M sequence differing in each transmission cycle from among the determined plurality of M sequences and sends out an ultrasonic signal modulated by the selected M sequence and an electromagnetic wave signal to the reception side. The reception side calculates a value of correlation between the ultrasonic signal and a model waveform, detects a first main peak of the calculated correlation value and calculates an ultrasonic propagation time from a time point of the reception of the electromagnetic wave signal and a time point of the detection of the main peak. | 05-19-2011 |
20110222373 | METHODS, SYSTEMS, AND APPARATUS TO CALCULATE DISTANCE FROM AUDIO SOURCES - Systems, methods, articles of manufacture and apparatus are disclosed to calculate distance from audio sources. An example method disclosed herein includes receiving, at the reference audio collecting device, a first radio frequency (RF) signal from the portable audio collecting device, in response to receiving the RF signal, storing ambient audio to a memory as reference data samples, each of the reference data samples associated with an indication of a respective time of acquisition, and receiving a second RF signal containing portable data samples of the ambient audio, each of the portable data samples associated with an indication of a respective time of acquisition. The example method also includes computing a correlation value between a set of the portable data samples and a plurality of the reference data samples, selecting a set of samples having a highest correlation value, subtracting the indication of times of the pair of samples to form a difference value, and calculating a distance between the portable audio device and the reference audio collecting device based on the difference value. | 09-15-2011 |
20120127832 | SYSTEM AND METHOD FOR ESTIMATING THE DIRECTION OF ARRIVAL OF A SOUND - A system and method for estimating the direction of arrival of sounds. One method including the steps of: forming a reference signal; detecting sound with two or more spatially separated, directional or spatially separated directional, microphones to produce two or more output signals; calculating the relationships between each of the two or more output signals and the reference signal; and estimating the direction of arrival based on differences between the relationships. | 05-24-2012 |
20120263020 | Mobile Device Localization Using Audio Signals - Mobile device localization using audio signals is described. In an example, a mobile device is localized by receiving a first audio signal captured by a microphone located at the mobile device and a second audio signal captured from a further microphone. A correlation value between the first audio signal and second audio signal is computed, and this is used to determine whether the mobile device is in proximity to the further microphone. In one example, the mobile device can receive the audio signals from the further microphone and calculate the correlation value. In another example, a server can receive the audio signals from the mobile device and the further microphone and calculate the correlation value. In examples, the further microphone can be a fixed microphone at a predetermined location, or the further microphone can be a microphone located in another mobile device. | 10-18-2012 |
20140269199 | SYSTEM AND METHOD FOR DETECTING AND RESPONDING TO INDOOR SHOOTERS - A gunshot detection system having one or more sensors detecting indoor shootings and reporting gunshot detection to a central monitoring system. Each sensor includes a microphone and comparison circuit for processing detected sounds and determining whether the sound is indicative of gunshot. If a gunshot is detected, the sensor reports the detection to nearby sensors and to the central system. The central system can interface with third party systems, such as law enforcement communication systems, to provide particularized information to assist first responding in dealing appropriately with situation. | 09-18-2014 |
20150023138 | Ultrasonic Positioning System and Method Using the Same - Described herein are an ultrasonic positioning system integrated in an electronic device, and a method using the same. The ultrasonic positioning system comprises an ultrasound generator, two or more ultrasound receivers, and a control unit. Said ultrasound generator is configured to generate an ultrasound wave. Said two or more ultrasound receivers are configured to receive a reflected ultrasound wave produced by reflection of the ultrasound wave by an object in a field. Said control unit is configured to determine a position and/or a speed of the object using a frequency shift or a delay or both of the reflected ultrasound wave relative to the ultrasound wave. The ultrasonic positioning system provides gesture recognition and non-contact control of the device based on the ultrasonic positioning function of the device. | 01-22-2015 |
20150362582 | Spatial Localization of Intermittent Noise Sources By Acoustic Antennae - A noise source localization process that uses as few as four microphones in an antenna array. The process combines different averaging to the information from the various signals with non-linear (wavelet-based) filtering, cross-correlation and triangulation to more particularly locate a noise source relative to a target point. The process calculates a propagation time based on the distance from a target to each microphones, delays each of the signals according to the propagation time from the target, calculates a continuous wavelet transform for each of the signals to band-pass filter each of the signals according to a predetermined frequency of interest, determines the product of each pair of signals to produce correlation fringes, and locates the noise source based on the product of the pairs of signals. | 12-17-2015 |
20160041251 | ULTRASOUND-BASED LOCATION DETERMINATION AND INERTIAL NAVIGATION WITH ACCURACY IMPROVEMENT IN DETERMINING CLIENT DEVICE LOCATION - Spatially located ultrasound beacons are provided in known locations within a distributed communication system. The ultrasound beacons are configured to emit ultrasound pulses that can be received by client devices in ultrasound communication range of the beacons. The client devices analyze the received ultrasound pulses from the beacons to determine their time-difference of arrival and as a result, their location(s) within the distributed communication system. The client devices have inertial navigation systems (NS) that calculate client device location as the client device moves, and when received ultrasound signals are below a predefined threshold. Suspected errors in the location information from either the ultrasound or INS systems may be compared against the other system, or compared against reference information, to determine the validity of the location information. | 02-11-2016 |
20160061929 | AN AUTONOMOUS SURVEILLANCE SYSTEM FOR BLIND SOURCES LOCALIZATION AND SEPARATION - A sound monitoring system provides autonomous and silent)) surveillance to monitor sound sources stationary or moving in 3D space and a blind separation of target acoustic signals. The underlying principle of this technology is a hybrid approach that uses: 1) passive sonic detection and ranging method that consists of iterative triangulation and redundant checking to locate the Cartesian coordinates of arbitrary sound sources in 3D space, 2) advanced signal processing to sanitize the measured data and enhance signal to noise ratio, and 3) short-time source localization and separation to extract the target acoustic signals from the directly measured mixed ones. | 03-03-2016 |
20160116591 | OBJECT DETECTING APPARATUS - An object detecting apparatus includes a distance calculator that calculates a distance to the object, a wave height acquirer that acquires a respective peak value of the plurality of reflected waves, and multiple reflection determiner. When a reflected wave for which a first distance to the object is calculated to be the smallest in the reflected waves is defined as a first wave, and another reflected wave to which a second distance is calculated as twice or more integer times the first distance calculated for the first wave and a difference of the peak value relative to the first wave which is larger than a predetermined value is present in the reflected waves, the multiple reflection determiner determines that multiple reflection is occurring in a second wave or thereafter. | 04-28-2016 |
20160154089 | METHOD AND APPARATUS FOR PERFORMING ULTRASONIC PRESENCE DETECTION | 06-02-2016 |
20160187452 | POSITIONAL STATE IDENTIFICATION OF MOBILE DEVICES - One or more systems and/or methods for identifying a positional state of a mobile device are provided. An output audio pulse may be generated from a speaker of a mobile device. An input audio pulse, corresponding to the output audio pulse, may be detected utilizing a microphone of the mobile device. The output audio pulse and the input audio pulse may be evaluated to determine a positional feature associated with the mobile device. The positional feature may be evaluated using a classifier to identify a positional state of the mobile device (e.g., the mobile device may be laying on a table, inside a user's jacket pocket, within a vehicle, etc.). In an example, an operating characteristic of the mobile device may be adjusted based on the positional state of the mobile device (e.g., a ringer volume may be increased, a content recommendation may be displayed, etc.). | 06-30-2016 |
20160187454 | SYSTEM AND METHOD FOR SEPARATING SOUND AND CONDITION MONITORING SYSTEM AND MOBILE PHONE USING THE SAME - Invention provides a system and method for separating sound from an object of interest from its background and condition monitoring system and mobile phone using the same. The sound separating system includes a sound source localizing part, including at least one microphone and a processing unit, and an object direction reference determination part, determining, as object direction reference, information on directions of the object of interest with respect to the sound source localizing part; wherein the processing unit obtains information on a direction from which sound arrives at the sound source localizing part from the sound source by using microphone signal, and comparing it with the object direction reference so as to filter the sound from the background of the sound source. By having the sound separating system, it can extract the background noise from a specific device respective location and analyse only these signals from the object of interest. | 06-30-2016 |
20160252604 | DETERMINING MISS DISTANCE AND BULLET SPEED OF A BURST OF BULLETS | 09-01-2016 |
367125000 | Phase comparison and/or correlation | 17 |
20080247274 | SENSOR ARRAY POST-FILTER FOR TRACKING SPATIAL DISTRIBUTIONS OF SIGNALS AND NOISE - A “Sensor Array Post-Filter” provides an adaptive post-filter that accurately models and suppresses both diffuse and directional noise sources as well as interfering speech sources. The post-filter is applied to an output signal produced by a beamformer used to process signals produced by a sensor array. As a result, the Sensor Array Post-Filter operates to improve the signal-to-noise ratio (SNR) of beamformer output signals by providing adaptive post-filtering of the output signals. The post-filter is generated based on a generative statistical model for modeling signal and noise sources at distinct regions in a signal field that considers prior distributions trained to model an instantaneous direction of arrival for signals captured by sensors in the array. | 10-09-2008 |
20090168604 | DUAL-RECEIVING ULTRASONIC DISTANCE MEASURING EQUIPMENT - A dual-receiving ultrasonic distance measuring equipment is disclosed, which uses a transmitter and two receivers, one of which serves as an objective and the other as a reference, to perform distance measurement. The transmitter and the reference receiver are fixedly installed on a phase adjusting platform, capable of adjusting a reference phase by fine-tuning the distance between the transmitter and the reference receiver. As the objective receiver is disposed on an object under measurement which is a distance away from the phase adjusting platform, there will be a phase shift due to the propagation of an ultrasonic wave from the transmitter as it is received by the two receivers. And thereby, the distance between the two receivers can be calculated based on the phase shift. The aforesaid ultrasonic distance measuring equipment can be applied in the positioning system of high precision machinery or other non-contact distance measuring system. | 07-02-2009 |
20090257314 | ACOUSTIC WIDE AREA AIR SURVEILLANCE SYSTEM - A method and apparatus for detecting an aircraft. The method is provided for wide area tracking of aircraft. An acoustic emission of the aircraft is detected from a plurality of locations. A position of the aircraft at a set of times is estimated by comparing a set of harmonically related Doppler shifted frequencies for the acoustic emission to an expected zero Doppler shifted frequency of the aircraft to form an estimated position. The position of the aircraft and a heading of the aircraft are tracked using the estimated position. The aircraft type is classified based on the corresponding set of zero Doppler frequencies at each acoustic sensor. | 10-15-2009 |
20090310444 | Signal Processing Apparatus, Signal Processing Method, and Program - A signal processing apparatus includes: a learning processing unit that finds a separating matrix for separating mixed signals in which outputs from a plurality of sound sources are mixed, by a learning process that applies ICA (Independent Component Analysis) to observed signals including the mixed signals; a separation processing unit that applies the separating matrix to the observed signals to separate the mixed signals and generate separated signals corresponding to each of the sound sources; and a sound source direction estimating unit that computes a sound source direction of each of the generated separated signals. The sound source direction estimating unit calculates cross-covariance matrices between the observed signals and the separated signals in corresponding time segments in time-frequency domain, computes phase differences between elements of the cross-covariance matrices, and computes a sound source direction corresponding to each of the separated signals by applying the computed phase differences. | 12-17-2009 |
20100054085 | Method and Device for Locating a Sound Source - A method of locating a sound source based on sound received at an array of microphones comprises the steps of determining a correlation function of signals provided by microphones of the array and establishing a direction in which the sound source is located based on at least one eigenvector of a matrix having matrix elements which are determined based on the correlation function. The correlation function has first and second frequency components associated with a first and second frequency band, respectively. The first frequency component is determined based on signals from microphones having a first distance, and the second frequency component is determined based on signals from microphones having a second distance different from the first distance. | 03-04-2010 |
20100157738 | Sonic Wave Output Device, Voice Communication Device, Sonic Wave Output Method and Program - There is provided a sonic wave output device comprising, a receiving unit to receive wireless signals transmitted from a certain signal source, a determination unit to determine a parameter value depending on a location of the signal source using the wireless signals received by the receiving unit and a sonic wave output unit to output sonic waves with directionality toward a direction of the signal source based on the parameter value. | 06-24-2010 |
20110103191 | APPARATUS AND METHOD TO TRACK POSITIONS OF MULTIPLE SOUND SOURCES - Disclosed herein is an apparatus and method to track positions of multiple sound sources which can simultaneously track the positions of multiple sound sources. Sound signals input to an array of microphones are separated into independent sound source signals, correlation coefficients between the sound signals input to the microphones and the separated sound source signals are estimated, and the estimated correlation coefficients are analyzed to track the positions of the sound sources. | 05-05-2011 |
20110261654 | OPTIMUM PSEUDO RANDOM SEQUENCE DETERMINING METHOD, POSITION DETECTION SYSTEM, POSITION DETECTION METHOD, TRANSMISSION DEVICE AND RECEPTION DEVICE - To enable precise calculation of a propagation time of a direct wave which arrives fastest from an ultrasonic generation source without being affected by a reflected wave of an ultrasonic signal. | 10-27-2011 |
20110261655 | Method for Determining the Location of an Impact on a Surface of an Object - The invention relates to a method for determining the location of an impact on a surface of an object based on the analysis of an acoustic signal generated by the impact. This method further comprises a signal treatment step of weighting the acoustic signal to take into account spurious contributions in particular due to reflections at the border of the object. | 10-27-2011 |
20120069714 | SOUND DIRECTION ESTIMATION APPARATUS AND SOUND DIRECTION ESTIMATION METHOD - A sound direction estimation apparatus includes a sound source model storage unit that stores likelihood of a sound source class in correspondence with a sound feature quantity, a sound signal input unit that receives a sound signal, a sound source identification unit that identifies a sound source class of the sound signal input from the sound signal input unit with reference to the sound source model storage unit based on the sound feature quantity of the sound signal, and a first sound source localization unit that estimates a sound direction of the sound signal of the sound source class identified by the sound source identification unit. | 03-22-2012 |
20120075958 | Cavity Detection - An apparatus for detecting a cavity comprising a signal receiver, a signal analyzer and a threshold excedent determination processor. The signal receiver receives a reflected signal resulting from an interaction of multi-frequency irradiating signal(s) with at least one cavity. The irradiating signal may include an electromagnetic or acoustic signal above a cavity dependent cutoff frequency with a randomized spectral component. The signal analyzer computes cavity detecting statistic(s) of the reflected signal. The cavity detecting statistic(s) may include an autocorrelation function. The autocorrelation function may be a Fourier transform of the power spectral density of the reflected signal. The threshold excedent determination processor generates a notification when cavity detecting statistic(s) exceed a threshold. The threshold may include a multi-variable function. The cavity may be the bore of a weapon. The apparatus may be configured to determine the bearing from the cavity to the apparatus. | 03-29-2012 |
20130107669 | VEHICLE LOCALIZATION | 05-02-2013 |
20140204715 | ACOUSTIC POSITIONING SYSTEM AND METHOD - An acoustic positioning device includes an acoustic emitter and receiver. The device emits a sequence of at least one first acoustic signal (S | 07-24-2014 |
20160033619 | ULTRASONIC LOCATIONING SYSTEM USING A DUAL PHASE PULSE - An ultrasonic locationing system using a dual phase pulse includes an emitter emitting two consecutive frequency bursts, each having a different phase, within one ultrasonic pulse. A receiver microphone receives the ultrasonic pulse, and a processor runs an amplitude-based detection algorithm on the pulse for a band of frequencies of interest and detects a first burst of the pulse within the proper frequency band and having an amplitude exceeding a threshold. Whereupon, the processor determines a relative phase difference between the first burst and a second burst of the pulse and determines whether the relative phase difference is within a predetermined acceptance window, indicating that the pulse is valid for use in locationing the emitter and associated mobile device. | 02-04-2016 |
20160061597 | DETERMINATION OF A ROOM DIMENSION ESTIMATE - An apparatus for determining a room dimension estimate comprises a receiver ( | 03-03-2016 |
20160061930 | METHOD AND DEVICE FOR PHASE-BASED LOCALIZATION OF A TARGET DEVICE USING INTERVAL ANALYSIS - Location of underwater moving target device carrying a receiver configured to detect acoustic waves emitted at a known location is estimated such that to be consistent with detected velocity and orientation of the target device, and with a current phase of a signal corresponding to the acoustic waves detected at the target device. A stack including one or more boxes obtained by applying contractors to location boxes is output as the estimate of the location of the moving target device. | 03-03-2016 |
20190146054 | WAVE SOURCE DIRECTION ESTIMATION APPARATUS, WAVE SOURCE DIRECTION ESTIMATION SYSTEM, WAVE SOURCE DIRECTION ESTIMATION METHOD, AND WAVE SOURCE DIRECTION ESTIMATION PROGRAM | 05-16-2019 |
367126000 | Addition or subtraction | 1 |
20130329524 | NEUROMORPHIC SIGNAL PROCESSING DEVICE ANDMETHOD FOR LOCATING SOUND SOURCE USING A PLURALITYOF NEURON CIRCUITS - Provided is a neuromorphic signal processing device for locating a sound source using a plurality of neuron circuits, the neuromorphic signal processing device including a detector configured to output a detected spiking signal using a detection neuron circuit corresponding to a predetermined time difference, in response to a first signal and a second signal containing an identical input spiking signal with respect to the predetermined time difference, for each of a plurality of predetermined frequency bands, a multiplexor configured to output a multiplexed spiking signal corresponding to the predetermined time difference based on a plurality of the detected spiking signals output from a plurality of neuron circuits corresponding to the plurality of frequency bands, and an integrator configured to output an integrated spiking signal corresponding to the predetermined time difference, based on a plurality of the multiplexed spiking signals corresponding to a plurality of predetermined time differences. | 12-12-2013 |