Directive Circuits For Microphones Patents (Class 381/92)
  • Patent number: 9173046
    Abstract: A method of modelling microphone characteristics of a target microphone is provided. An impulse response of target microphones is measured over different angles. A signal conditioning on the measurement data is performed. The spatial response based on a spatial response matching algorithm is matched and filter parameters and/or model parameters are determined.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: October 27, 2015
    Assignee: Sennheiser electronic GmbH & Co. KG
    Inventors: Tom-Fabian Frey, Daniel Schlessinger, Stephan Scherthan
  • Patent number: 9167357
    Abstract: A method and system for improving signal-to-noise ratio of output signals of a microphone system having two or more microphones due to acoustic useful signals occurring at sides of the system, is used in hearing instruments, especially hearing aids worn on the head. High and low frequency portions (cut-off frequency between 700 Hz and 1.5 kHz, approx. 1 kHz) are processed differently. In low frequency ranges, differential microphone signals directed towards left and right are produced to determine lateral useful and noise sound levels using two directional signals. These levels are used for individual Wiener filtering for every microphone signal. The natural head shadowing effect is used in high frequency ranges as a pre-filter for noise and useful sound estimation for subsequent Wiener filtering. The methods are used in hearing instruments worn on the head individually for high or for low frequencies and in combination complement each other.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: October 20, 2015
    Assignee: Sivantos Pte. Ltd.
    Inventor: Eghart Fischer
  • Patent number: 9167358
    Abstract: A method and system for improving signal-to-noise ratio of output signals of a microphone system having two or more microphones due to acoustic useful signals at sides of the system are used in hearing instruments, especially hearing aids worn on the head. High and low frequency portions (cut-off frequency between 700 Hz and 1.5 kHz, approx. 1 kHz) are processed differently. In low frequency ranges, differential microphone signals directed towards left right are produced to determine lateral useful and noise sound levels using these two directional signals. These levels are used for subjecting every microphone signal to individual Wiener filtering. The natural head shadowing effect is used in high frequency ranges as a pre-filter for noise and useful sound estimation for subsequent Wiener filtering. The methods are used in hearing instruments worn on the head individually for high or low frequencies or in combination and complement each other.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: October 20, 2015
    Assignee: Sivantos Pte. Ltd.
    Inventor: Eghart Fischer
  • Patent number: 9159335
    Abstract: Provided are an apparatus and method for estimating noise and a noise reduction apparatus employing the same. The noise estimation apparatus estimates noise by blocking audio signals from a direction of a target sound source from received audio signals, and compensating for distortions from directivity gains of a target sound blocker blocking the audio signals from the target sound source.
    Type: Grant
    Filed: September 10, 2009
    Date of Patent: October 13, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyu-hong Kim, Kwang-cheol Oh
  • Patent number: 9161149
    Abstract: A method for encoding three dimensional audio by a wireless communication device is disclosed. The wireless communication device detects an indication of a plurality of localizable audio sources. The wireless communication device also records a plurality of audio signals associated with the plurality of localizable audio sources. The wireless communication device also encodes the plurality of audio signals.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: October 13, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Lae-Hoon Kim, Pei Xiang
  • Patent number: 9143856
    Abstract: An apparatus for capturing audio information from a target location includes first and second beamformers arranged in a recording environment and having first and second recording characteristics, respectively, and a signal generator. The first and second beamformers are configured for recording first and second beamformer audio signals, respectively, when they are directed towards the target location with respect to the first and second recording characteristics. The first and second beamformers are arranged such that first and second virtual straight lines, defined to pass through the first and second beamformers, respectively, and the target location, are not mutually parallel. The signal generator is configured to generate an audio output signal based on the first and second beamformer audio signals so that the audio output signal reflects relatively more audio information from the target location compared to the audio information from the target location in the first and second beamformer audio signals.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: September 22, 2015
    Assignees: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Friedrich-Alexander-Universitaet Erlangen-Nuernberg
    Inventors: Juergen Herre, Fabian Kuech, Markus Kallinger, Giovanni Del Galdo, Bernhard Grill
  • Patent number: 9140774
    Abstract: A voice analyzer includes a plate-shaped body, a plurality of first voice acquisition units that are placed on both surfaces of the plate-shaped body and that acquire a voice of a speaker, a sound pressure comparison unit that compares sound pressure of a voice acquired by the first voice acquisition unit placed on one surface of the plate-shaped body with sound pressure of a voice acquired by the first voice acquisition unit placed on the other surface and determines a larger sound pressure, and a voice signal selection unit that selects information regarding a voice signal which is associated with the larger sound pressure and is determined by the sound pressure comparison unit.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: September 22, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kiyoshi Iida, Haruo Harada, Hirohito Yoneyama, Kei Shimotani, Akira Fujii, Yohei Nishino
  • Patent number: 9131294
    Abstract: An apparatus includes first and second microphone arrangements, arranged to output first and second signals respectively and is operable in a first mode and a second mode. In the first mode, an output signal is generated based on the second signal and a third signal, where the second signal and, optionally, the first signal, can be used to compensate for ambient noise, for example, for noise cancellation when a telephone call is relayed through a speaker. In the second mode, an output signal is generated based on the first and second signals. In this manner, the combination of the first and second microphone arrangements provides a directional sensitivity that can pick up sound from a remote source, for example, in an audio or video recording session. The apparatus may include a sensor to allow automatic switching between one or more of modes, directional sensitivity patterns and types of recording session.
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: September 8, 2015
    Assignee: Nokia Technologies Oy
    Inventor: Andrew P. Bright
  • Patent number: 9131295
    Abstract: Systems, methods, and computer media for separating audio sources in a multi-microphone system are provided. A plurality of audio sample groups can be received. Each audio sample group comprises at least two samples of audio information captured by different microphones during a sample group time interval. For each audio sample group, an estimated angle between an audio source and the multi-microphone system can be estimated based on a phase difference of the samples in the group. The estimated angle can be modeled as a combined statistical distribution that is a mixture of a target audio signal statistical distribution and a noise component statistical distribution. The combined statistical distribution can be analyzed to provide an accurate characterization of each sample group as either target audio signal or noise. The target audio signal can then be resynthesized from samples identified as part of the target audio signal.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: September 8, 2015
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Chanwoo Kim, Charbel Khawand
  • Patent number: 9128874
    Abstract: A method of using microphones to measure a particle velocity comprises steps: arranging a sound source, a first microphone and a second microphone in a space, wherein the first microphone is arranged between the sound source and second microphone, and wherein the first microphone is located at a first position and the second microphone is located at a second position more far away from the sound source than the first position; using the first and second microphones to measure the sound source and obtain first and second acoustic pressures respectively; using the first and second positions and an equivalent source method to establish a free-space Green's function, and using the first and second acoustic pressures and the equivalent source method to establish an acoustic pressure function; and using the free-space Green's function and acoustic pressure function to predict state space of sound amplitude and then obtain a particle velocity.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: September 8, 2015
    Assignee: National Tsing Hua University
    Inventors: Ching-Cheng Chen, Mingsian R. Bai, Shen-Wei Juan
  • Patent number: 9121752
    Abstract: Provided is an acoustic measurement device capable of reducing the number of microphones while solving a problem of the dependency of interval between microphones on the frequency. The acoustic measurement device comprises a sound reception section (10) and a calculation section (20). The sound reception section includes a plurality of unidirectional microphones. The plurality of microphones of the sound reception section (10) are arranged such that the total sum of the unit vectors each facing the maximum sensitivity direction of the microphone is zero. The calculation section (20) calculates a particle velocity vector or acoustic intensity by multiplying respective unit vectors by measurement values of each of the plurality of microphones of the sound reception section and calculates acoustic information by vector-synthesizing the results.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: September 1, 2015
    Assignee: NIHON UNIVERSITY
    Inventor: Toshiki Hanyu
  • Patent number: 9112984
    Abstract: According to some aspects, a method of monitoring an acoustic environment of a mobile device, at least one computer readable medium encoded with instructions that, when executed, perform such a method and/or a mobile device configured to perform such a method is provided. The method comprises receiving, by the mobile device, acoustic input from the environment of the mobile device, detecting whether the acoustic input includes a voice command from a user without requiring receipt of an explicit trigger from the user, and initiating responding to the detected voice command.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: August 18, 2015
    Assignee: Nuance Communications, Inc.
    Inventors: Vladimir Sejnoha, Paul Adrian Van Mulbregt, Glen Edward Wilson, William F. Ganong, III
  • Patent number: 9111522
    Abstract: The implementations described include an audio canceling device that receives and audio signal from within an environment, identifies desired and undesired audio from the received audio signal and generates an attenuation-signal for use in canceling out or reducing the volume of the undesired audio at a canceling location. In addition, the audio canceling device, may determine a time delay before the attenuation-signal should be transmitted from an output based on a distance between the undesired audio source location and the canceling location and a distance between the output and the canceling location.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: August 18, 2015
    Assignee: Amazon Technologies, Inc.
    Inventor: William Spencer Worley, III
  • Patent number: 9107007
    Abstract: There is provided a microphone unit having a plurality of miniature microphones for respectively recording audio signals and a carrier unit. The miniature microphones can be arranged on a side of the carrier unit.
    Type: Grant
    Filed: April 8, 2011
    Date of Patent: August 11, 2015
    Assignee: Sennheiser electronic GmbH & Co. KG
    Inventor: Juergen Peissig
  • Patent number: 9107010
    Abstract: An RMS detector uses the concept of the k-NN (classifying using nearest neighbors)—algorithm in order to obtain RMS values. A rms detector using first-order regressor with a variable smoothing factor is modified to penalize samples from center of data in order to obtain RMS values. Samples which vary greatly from the background noise levels, such as speech, scratch, wind and other noise spikes, are dampened in the RMS calculation. When background noise changes, the system will track the changes in background noise and include the changes in the calculation of the corrected RMS value. A minimum tracker runs more often (e.g. two or three times) than the rate as in prior art detectors and methods, tracks the minimum rms value, which is to compute a normalized distance value, which in turn is used to normalize the smoothing factor.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: August 11, 2015
    Assignee: Cirrus Logic, Inc.
    Inventor: Ali Abdollahzadeh Milani
  • Patent number: 9100735
    Abstract: Techniques are provided for vector noise cancellation. Different value combinations for a plurality of weighting factors may be established for a plurality of selection regions. Each value combination for the plurality of weighting factors may correspond to a different combination of a set of input signals. One or more characteristics of input signals may be used to select a particular selection region. A particular value combination of the set of weighting factors may be chosen to attenuate or amplify the input signals to generate one or more output signals.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: August 4, 2015
    Assignee: DOLBY LABORATORIES LICENSING CORPORATION
    Inventor: Jon C. Taenzer
  • Patent number: 9099973
    Abstract: In a system and method for maintaining the spatial stability of a sound field a balance gain may be calculated for two or more microphone signals. The balance gain may be associated with a spatial image in the sound field. Signal values may be calculated for each of the microphone. The signal values may be signal estimates or signal gains calculated to improve a characteristic of the microphone signals. The differences between the signal values associated with each microphone signal may be limited although some difference between signal values may be allowable. One or more microphone signals are adjusted responsive to the two or more balance gains and the signal gains to maintain the spatial stability of the sound field. The adjustments of one or more microphone signals may include mixing of two or more microphone. The signal gains are applied to the two or more microphone signals.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: August 4, 2015
    Assignee: 2236008 Ontario Inc.
    Inventor: Phillip Alan Hetherington
  • Patent number: 9099094
    Abstract: Microphone arrays (MAs) are described that position and vent microphones so that performance of a noise suppression system coupled to the microphone array is enhanced. The MA includes at least two physical microphones to receive acoustic signals. The physical microphones make use of a common rear vent (actual or virtual) that samples a common pressure source. The MA includes a physical directional microphone configuration and a virtual directional microphone configuration. By making the input to the rear vents of the microphones (actual or virtual) as similar as possible, the real-world filter to be modeled becomes much simpler to model using an adaptive filter.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: August 4, 2015
    Assignee: AliphCom
    Inventor: Gregory C. Burnett
  • Patent number: 9086475
    Abstract: Provided are methods and systems for finding the location of sensors (e.g., microphones) with unknown internal delays based on a set of events (e.g., acoustic events) with unknown event time. A localization algorithm may iteratively run to compute the acoustic event times, the observation delays, and the relative locations of the events and the sensors.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: July 21, 2015
    Assignee: GOOGLE INC.
    Inventors: Willem Bastiaan Kleijn, Nikolay D. Gaubitch, Richard Heusdens
  • Patent number: 9084068
    Abstract: A method may include receiving video recorded with a camera and audio recorded with a microphone, wherein the video and audio were recorded simultaneously, and wherein the microphone is configured to move relative to the camera. The method may further include receiving a selection from a user of an object in the video, wherein the object is collocated with the microphone that recorded the audio. The method may further include tracking the object in the video and determining a location over time of the microphone relative to the camera based on the tracking of the object.
    Type: Grant
    Filed: May 30, 2011
    Date of Patent: July 14, 2015
    Assignees: Sony Corporation, Sony Mobile Communications AB
    Inventors: Bengt Magnus Abrahamsson, Martin Nyström, Åke Rydgren
  • Patent number: 9084036
    Abstract: In one aspect, a method for performing signal source localization is provided. The method comprises the steps of obtaining compressive measurements of an acoustic signal or other type of signal from respective ones of a plurality of sensors, processing the compressive measurements to determine time delays between arrivals of the signal at different ones of the sensors, and determining a location of a source of the signal based on differences between the time delays. The method may be implemented in a processing device that is configured to communicate with the plurality of sensors. In an illustrative embodiment, the compressive measurements are obtained from respective ones of only a designated subset of the sensors, and a non-compressive measurement is obtained from at least a given one of the sensors not in the designated subset, with the time delays between the arrivals of the signal at different ones of the sensors being determined based on the compressive measurements and the non-compressive measurement.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: July 14, 2015
    Assignee: Alcatel Lucent
    Inventors: Hong Jiang, Boyd T. Mathews, Paul A. Wilford
  • Patent number: 9077287
    Abstract: Disclosed is a sound detecting circuit which includes a sensing unit configured to generate an AC signal in response to a sound pressure level of a sound signal; an amplification unit configured to amplify the AC signal; and a bias voltage generating unit configured to generate a bias voltage to be provided to the amplification unit. The bias voltage generating unit comprises a current source configured to provide a power current; and a current-voltage converting circuit configured to convert the power current into the bias voltage and to reduce a noise due to the power current.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: July 7, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Yi-Gyeong Kim, Min-Hyung Cho, Tae Moon Roh, Jong-Kee Kwon, Woo Seok Yang, Jongdae Kim
  • Patent number: 9076450
    Abstract: Techniques are described for selecting audio from locations that are most likely to be sources of spoken commands or words. Directional audio signals are generated to emphasize sounds from different regions of an environment. The directional audio signals are processed by an automated speech recognizer to generate recognition confidence values corresponding to each of the different regions, and the region resulting in the highest recognition confidence value is selected as the region most likely to contain a user who is speaking commands.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: July 7, 2015
    Assignee: Amazon Technologies, Inc.
    Inventors: Ramy S. Sadek, Edward Dietz Crump, Joshua Pollack
  • Publication number: 20150146882
    Abstract: A microphone array system for sound acquisition from multiple sound sources in a reception space surrounding a microphone array that is interfaced with a beamformer module is disclosed. The microphone array includes microphone transducers that are arranged relative to each other in N-fold rotationally symmetry, and the beamformer includes beamformer weights that are associated with one of a plurality of spatial reception sectors corresponding to the N-fold rotational symmetry of the microphone array. Microphone indexes of the microphone transducers are arithmetically displaceable angularly about the vertical axis during a process cycle, so that a same set of beamformer weights is used selectively for calculating a beamformer output signal associated with any one of the spatial reception sectors. A sound source location module is also disclosed that includes a modified steered power response sound source location method. A post filter module for a microphone array system is also disclosed.
    Type: Application
    Filed: November 26, 2013
    Publication date: May 28, 2015
    Applicant: DEV-AUDIO PTY LTD.
    Inventor: Iain Alexander McCowan
  • Publication number: 20150146883
    Abstract: Systems and methods are disclosed for managing input to and output from a microphone, including adapting the microphone's response to changing polar response patterns among multiple microphone capsules, providing output via multi-colored lights to reflect the system state and operational characteristics, and sending various information to and from the microphone (such as carrying power to the microphone, digital and/or analog audio from the microphone, and data to and/or from the microphone) via a single cable.
    Type: Application
    Filed: November 28, 2014
    Publication date: May 28, 2015
    Inventors: Gennady Palitsky, Mark Efim Naiditch, Andrew Ross Green
  • Patent number: 9042574
    Abstract: Audio signals are processed for use in a communication event. A data store may be queried to obtain an indication of an echo direction, which relates to a direction from which audio signals output from the audio output are likely to be received at a microphone array (plurality of microphones) of a device. Beamformer coefficients of an adaptive beamformer of the device are determined in dependence upon the received indication of the echo direction. Audio signals are received at the microphone array. The adaptive beamformer applies the determined beamformer coefficients to the received audio signals, thereby generating a beamformer output for use in the communication event. The beamformer coefficients are determined such that echo suppression is applied to audio signals received at the microphone array from the indicated echo direction.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: May 26, 2015
    Assignee: SKYPE
    Inventor: Karsten Vandborg Sorensen
  • Patent number: 9042573
    Abstract: Beamformer coefficients may include a plurality of sets of theoretical statistical data for theoretical signals. Each theoretical signal may have its own particular attributes. The statistical data may be used in computing beamformer coefficients for application by a beamformer to signals received at a device. Signals are received at an input of the device. A respective plurality of weights is determined, for the theoretical statistical data sets, based on an analysis of the extent to which the signals have the particular attributes of the theoretical signals. The theoretical are retrieved, and a statistical data set is calculated for the signals by performing a weighted sum of the theoretical statistical data sets using the determined respective plurality of weights. Beamformer coefficients are computed based on the calculated statistical data set for the signals, which are used by a beamformer to the signals for generating a beamformer output.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: May 26, 2015
    Assignee: Skype
    Inventors: Per Åhgren, Karsten Vandborg Sorensen
  • Patent number: 9042571
    Abstract: In some embodiments, a method for processing output of at least one microphone of a device (e.g., a headset) to identify at least one touch gesture exerted by a user on the device, including by distinguishing the gesture from input to the microphone other than a touch gesture intended by the user, and by distinguishing between a tap exerted by the user on the device and at least one dynamic gesture exerted by the user on the device, where the output of the at least one microphone is also indicative of ambient sound (e.g., voice utterences). Other embodiments are systems for detecting ambient sound (e.g., voice utterences) and touch gestures, each including a device including at least one microphone and a processor coupled and configured to process output of each microphone to identify at least one touch gesture exerted by a user on the device.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: May 26, 2015
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Glenn N. Dickins, David P. Doney, Andreas Ehret, Xuejing Sun
  • Publication number: 20150139444
    Abstract: A two-scale array for detecting wind noise signals and acoustic signals includes a plurality of subarrays each including a plurality of microphones. The subarrays are spaced apart from one another such that the subarrays are configured to detect acoustic signals, and the plurality of microphones in each subarray are located close enough to one another such that wind noise signals are substantially correlated between the microphones in each subarray.
    Type: Application
    Filed: May 15, 2013
    Publication date: May 21, 2015
    Applicant: University of Mississippi
    Inventor: William Garth Frazier
  • Patent number: 9031257
    Abstract: Method, device and computer program product for processing signals at the device. Signals are received, over a range of angles, at a plurality of sensors of the device, the received signals including an interfering signal received from an interfering source location. An interference delay pattern between receipt of signals at the sensors corresponding to receipt of a signal from the interfering source location is determined. A plurality of regularization signals having a delay pattern matching the determined interference delay pattern are generated. The generated regularization signals are used to determine beamformer coefficients to be applied by a beamformer, and the beamformer applies the determined beamformer coefficients to the signals received by the plurality of sensors, thereby generating a beamformer output.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: May 12, 2015
    Assignee: Skype
    Inventors: Karsten Vandborg Sorensen, Per Åhgren
  • Patent number: 9031256
    Abstract: A method of orientation-sensitive recording control includes indicating, within a portable device and at a first time, that the portable device has a first orientation relative to a gravitational axis and, based on the indication, selecting a first pair among at least three microphone channels of the portable device. This method also includes indicating, within the portable device and at a second time that is different than the first time, that the portable device has a second orientation relative to the gravitational axis that is different than the first orientation and, based on the indication, selecting a second pair among the at least three microphone channels that is different than the first pair. In this method, each the at least three microphone channels is based on a signal produced by a corresponding one of at least three microphones of the portable device.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: May 12, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ian Ernan Liu, Dinesh Ramakrishnan, Lae-Hoon Kim, Pei Xiang
  • Patent number: 9031259
    Abstract: It is determined whether or not a sound picked up by at least either a first microphone or a second microphone is a speech segment. When it is determined that the sound picked up by the first or the second microphone is the speech segment, a voice incoming direction indicating from which direction a voice sound travels is detected based on a first sound pick-up signal obtained based on a sound picked up by the first microphone and a second sound pick-up signal obtained based on a sound picked up by the second microphone. A noise reduction process is performed using the first and second sound pick-up signals based on speech segment information indicating that the sound picked up by the first or the second microphone is the speech segment and voice incoming-direction information indicating the voice incoming direction.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: May 12, 2015
    Assignee: JVC Kenwood Corporation
    Inventor: Takaaki Yamabe
  • Publication number: 20150124997
    Abstract: A sound processing apparatus (400) is provided with: a directivity synthesis processing unit (410) for generating a first directivity sound pick-up signal by synthesizing a first sound pick-up signal and a relatively delayed second sound pick-up signal and a second directivity sound pick-up signal by synthesizing a relatively delayed first sound pick-up signal and a second sound pick-up signal; a comparison signal calculation unit (440) for generating a non-directivity level signal indicating the level of a sum of the directivity sound pick-up signals and a directivity level signal by adding the levels of the directivity sound pick-up signals; a level comparison unit (451) for acquiring the difference between the levels of the non-directivity level signal and the directivity level signal; and a delay control unit (452) for adjusting the delay amount such that the difference between the levels becomes smaller.
    Type: Application
    Filed: October 24, 2012
    Publication date: May 7, 2015
    Applicant: Panasonic Corporation
    Inventors: Yutaka Banba, Takeo Kanamori
  • Patent number: 9025022
    Abstract: Certain aspects of an apparatus and method for gesture recognition using a two Dimensional (2D) imaging device may include capturing a first image of a hand in a first position, capturing a second image of the hand in a second position, generating an image mask for indicating the movement of the arm from the first position to the second position, determining an elbow position corresponding to the hand based on the image mask and estimating the change in depth of the hand from the first position to the second position based on the determined elbow position.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: May 5, 2015
    Assignee: Sony Corporation
    Inventors: Kuang-Man Andy Huang, Ming-Chang Liu, Wei Ji
  • Patent number: 9026451
    Abstract: Methods and systems for using pitch predictors in speech/audio coders are provided. Techniques for optimal pre- and post-filtering are presented, and a general result that post-filtering is more effective than pre-filtering is derived. A practical paired-zero filter design for the low-rate regime is proposed, and this design is extended to handle frequency-dependent periodicity levels. Further, the methods described provide a general performance measure for a post-filter that only uses information available at the decoder, thereby allowing for the optimization or selection of a post-filter without increasing the rate.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: May 5, 2015
    Assignee: Google Inc.
    Inventors: Willem Bastiaan Kleijn, Jan Skoglund
  • Patent number: 9025782
    Abstract: A multi-microphone system performs location-selective processing of an acoustic signal, wherein source location is indicated by directions of arrival relative to microphone pairs at opposite sides of a midsagittal plane of a user's head.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: May 5, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ian Ernan Liu
  • Publication number: 20150117671
    Abstract: In one embodiment, a method includes capturing sound using a plurality of microphones, wherein the plurality of microphones is associated with a computing system. The method also includes determining energy levels for the plurality of microphones, and determining signal-to-noise ratios (SNRs) for the plurality of microphones. Finally, the method includes selecting a particular microphone of the plurality of microphones based on the energy levels and the SNRs, wherein selecting the particular microphone includes providing audio signals obtained by the particular microphone to the computing system for use.
    Type: Application
    Filed: October 29, 2013
    Publication date: April 30, 2015
    Applicant: Cisco Technology, Inc.
    Inventors: Wei (Wilson) Chen, Hui (Alina) Wu, Mark Thomas Oden
  • Publication number: 20150117672
    Abstract: A spherical microphone array that includes a sound-diffracting structure having a closed three-dimensional shape of at least one non-regular, regular or semi-regular convex polyhedron with congruent faces of regular or non-regular polygons and at least two omnidirectional microphones disposed in or on the sound-diffracting structure on an oval line whose center is disposed on a center line that subtends the center of one of the faces of the regular polygons.
    Type: Application
    Filed: October 21, 2014
    Publication date: April 30, 2015
    Inventor: Markus CHRISTOPH
  • Publication number: 20150117673
    Abstract: Methods, systems, and techniques of digital signal processing using acoustic arrays are provided. Example embodiments described herein provide enhanced acoustic arrays that utilize MEMS digital microphones to offer greater control and measurement capabilities to users and systems that desire to measure sound typically to derive other data. Large numbers of digital microphones can be manufactured to be placed on an acoustic array to derive a plurality of derived acoustic array measurements.
    Type: Application
    Filed: October 22, 2014
    Publication date: April 30, 2015
    Inventor: Neil Fenichel
  • Patent number: 9020163
    Abstract: Devices and methods are disclosed that allow for selective acoustic near-field nulls for microphone arrays. One embodiment may take the form of an electronic device including a speaker and a microphone array. The microphone array may include a first microphone positioned a first distance from the speaker and a second microphone positioned a second distance from the speaker. The first and second microphones are configured to receive an acoustic signal. The microphone array further includes a complex vector filter coupled to the second microphone. The complex vector filter is applied to an output signal of the second microphone to generate an acoustic sensitivity pattern for the array that provides an acoustic null at the location of the speaker.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: April 28, 2015
    Assignee: Apple Inc.
    Inventors: Ronald Nadim Isaac, Martin E. Johnson
  • Publication number: 20150110288
    Abstract: In one embodiment, an audio system has a microphone array and a signal processing subsystem that processes audio signals generated by the microphone array to produce an output beampattern. The microphone array has (i) a first microphone set of two or more microphones located on a first ellipse, (ii) a second microphone set of two or more microphones located on a second ellipse within the first ellipse, and (iii) a third microphone set of one or more microphones located within the second ellipse, where the microphones in the first, second, and third microphone sets are effectively all in one plane. The signal processing subsystem has (1) a decomposer that spatially decomposes the microphone audio signals to generate a plurality of eigenbeams and (2) a beamformer that generates the output beampattern as a weighted sum of the eigenbeams.
    Type: Application
    Filed: October 22, 2014
    Publication date: April 23, 2015
    Inventors: Jens M. Meyer, Gary W. Elko
  • Patent number: 9014395
    Abstract: An audio analysis apparatus includes the following components. A main body includes a discrimination unit and a transmission unit. A strap is used for hanging the main body from a user's neck. A first audio acquisition device is provided to the strap or the main body. A second audio acquisition device is provided to the strap at a position where a distance between the second audio acquisition device and the user's mouth is smaller than the distance between the first audio acquisition device and the user's in a state where the strap is worn around the user's neck. The discrimination unit discriminates whether an acquired sound is an uttered voice of the user or of another person by comparing audio signals of the sound acquired by the first and second audio acquisition devices. The transmission unit transmits information including the discrimination result to an external apparatus.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: April 21, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Haruo Harada, Hirohito Yoneyama, Kei Shimotani, Yohei Nishino, Kiyoshi Iida, Takao Naito
  • Patent number: 9008323
    Abstract: A microphone system has an output and at least a first transducer with a first dynamic range, a second transducer with a second dynamic range different than the first dynamic range, and coupling system to selectively couple the output of one of the first transducer or the second transducer to the system output, depending on the magnitude of the input sound signal, to produce a system with a dynamic range greater than the dynamic range of either individual transducer. A method of operating a microphone system includes detecting whether a transducer output crosses a threshold, and if so then selectively coupling another transducer's output to the system output. Some embodiments combine the outputs of more than one transducer in a weighted sum during transition from one transducer output to another, as a function of time or as a function of the amplitude of the incident audio signal.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: April 14, 2015
    Assignee: Invensense, Inc.
    Inventors: Olli Haila, Kieran Harney, Gary W. Elko, Robert Adams
  • Patent number: 9008321
    Abstract: A method including: determining a time difference between at least a first audio channel and a second audio channel of the same acoustic space; and enabling a corrective time shift between the first audio channel and the second audio channel when the time difference exceeds a threshold.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: April 14, 2015
    Assignee: Nokia Corporation
    Inventors: Jussi Virolainen, Jussi Mutanen, Kai Samposalo
  • Patent number: 9008332
    Abstract: A processing chip for a digital microphone and related input circuit and a digital microphone are described herein. In one aspect, the input circuit for a processing chip of a digital microphone includes: a PMOS transistor, a resistor, a current source, and a low-pass filter. The described processing chip possesses high anti high-frequency interference capabilities and the described input circuit possesses high high-frequency power supply rejection ratio.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: April 14, 2015
    Assignee: Beijing KT Micro, Ltd.
    Inventors: Wenjing Wang, Jianting Wang, Rongrong Bai, Jing Cao
  • Patent number: 9002027
    Abstract: A space-time adaptive beamformer for reducing noise in a vehicle that includes two or more microphones. A first weighting network is used for adjusting the signal characteristics of at least one output of the microphones while at least one delay network is also used for delaying the output in time of at least one output of the microphones. A second weighting network then adjusts the signal characteristics of the output of each of the delay networks and at sum adder works to combine the output of the first weighting network and the second weighting network. Finally, an output of the sum adder is combined with an artificial noise free reference signal to provide a low distortion noise reduced output. By generating a desired signal that acts as an artificial noise free signal reference, adequate noise reduction to be obtained without the distortion created due to processing non-linearity.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: April 7, 2015
    Assignee: Gentex Corporation
    Inventors: Robert R. Turnbull, Michael A. Bryson
  • Patent number: 9002028
    Abstract: A communication system enhances communications in a noisy environment. Multiple input arrays convert a voiced or unvoiced signal into an analog signal. A converter receives the analog signal and generates digital signals. A digital signal processor determines temporal and spatial information from the digital signals. The processed signals are then converted to audible sound.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: April 7, 2015
    Assignee: Nuance Communications, Inc.
    Inventors: Tim Haulick, Gerhard Uwe Schmidt
  • Publication number: 20150092958
    Abstract: Methods, systems, and devices are described for providing audio to one or more individuals in an operating room. An ultrasonic signal generator may be provided that generates two or more ultrasonic signals that combine to produce an audible signal at a desired location. The audio signal may be perceived by individuals in the operating room to emanate from a surface or location within the operating room, or the audio signal may be generated to provide an audible signal to one or more persons within a particular location within the operating room. Multiple audio signals may be generated to emanate from multiple different locations. Likewise, multiple audio signals may be generated to provide different audible signals in different locations in the operating room.
    Type: Application
    Filed: July 18, 2014
    Publication date: April 2, 2015
    Inventors: DAVID J. VAN TOL, ANTHONY B. ROSS
  • Patent number: 8996383
    Abstract: A voice-control system for motor vehicles has a plurality of spaced microphones emitting respective microphone signals, and an evaluation unit connected to the microphones. This unit serves for assembling correlation pairs from the signals of two of the microphones, calculating a correlation coefficient for each correlation pair, detecting an energy value for each microphone, detecting a respective delay time of a voice signal between a voice signal source and the each of the microphones, and selecting in dependence on current correlation coefficients of the correlation pairs, on the current energy values of the microphones, and on the current delay time of the voice signal to the microphones, that microphone whose signal is optimal as a basis for the operation of the voice-control system.
    Type: Grant
    Filed: February 25, 2012
    Date of Patent: March 31, 2015
    Assignee: paragon AG
    Inventor: Klaus Rodemer
  • Publication number: 20150086039
    Abstract: A wearable microphone array apparatus and system used as a directional audio system and as an assisted listening device. The present invention advances hearing aids and assisted listening devices to allow construction of a highly directional audio array that is wearable, natural sounding, and convenient to direct, as well as to provide directional cues to users who have partial or total loss of hearing in one or both ears. The advantages of the invention include simultaneously providing high gain, high directivity, high side lobe attenuation, and consistent beam width; providing significant beam forming at lower frequencies where substantial noises are present, particularly in noisy, reverberant environments; and allowing construction of a cost effective body-worn or body-carried directional audio device.
    Type: Application
    Filed: December 5, 2014
    Publication date: March 26, 2015
    Applicant: WAVE SCIENCES LLC
    Inventor: James Keith McElveen