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Electrical Audio Signal Processing Systems And Devices > Directive Circuits For Microphones Directive Circuits For MicrophonesDirective Circuits For Microphones patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.11/15/07 - 20070263881 - Method and apparatus for locating a talker An apparatus for locating a talker, comprising a microphone array for receiving multiple audio signals, wherein the microphone array is characterized by a predetermined beampattern, a spectral conditioner for filtering the audio signals to optimize the beampattern for talker localization, a localization estimator for calculating a localization estimate based on ... 10/11/07 - 20070237340 - Microphone for surround-recording A three channel microphone for surround-sound recording is disclosed. This coincident microphone arrangement consist of three membranes 1, 2, 3 with bi-directional sound pressure gradient characteristics, which are arranged in close proximity to each other. The three membranes are housed each inside cylindrical protective microphone enclosures 5, 6, 7. Each ... 09/27/07 - 20070223732 - Methods and apparatuses for adjusting a visual image based on an audio signal In one embodiment, the methods and apparatuses detect a sound through a microphone device; determine a location of the sound through the microphone device; and automatically adjust a visual device based on the location of the sound wherein the visual device is configured to view an area corresponding with the ... 09/27/07 - 20070223730 - Normalization and calibration of microphones in sound-intensity probes A system for normalizing and calibrating the microphones of a sound-intensity probe or a composite of such probes, with respect to a stable comparison microphone with known acoustical characteristics. Normalizing and calibrating are performed using an apparatus 57 consisting of a tube with a loudspeaker inserted in one end and ... 07/26/07 - 20070172079 - Handsfree communication system A handsfree communication system includes microphones, a beamformer, and filters. The microphones are spaced apart and are capable of receiving acoustic signals. The beamformer compensates for propagation delays between the direct and reflected acoustic signals. The filters are configured to a predetermined susceptibility level. The filter process the output of ... 07/26/07 - 20070172078 - Device for localizing acoustic sources and measuring their intensities the device being designed to establish, for a frequency higher than a given value fc, an acoustic source hologram, i.e. a distribution of acoustic pressures or intensities at different computation points on a given surface. ... 07/05/07 - 20070154031 - System and method for utilizing inter-microphone level differences for speech enhancement Systems and methods for utilizing inter-microphone level differences to attenuate noise and enhance speech are provided. In exemplary embodiments, energy estimates of acoustic signals received by a primary microphone and a secondary microphone are determined in order to determine an inter-microphone level difference (ILD). This ILD in combination with a ... 06/28/07 - 20070147634 - Cluster of first-order microphones and method of operation for stereo input of videoconferencing system An arbitrarily positioned cluster of three microphones can be used for stereo input of a videoconferencing system. To produce stereo input, right and left weightings for signal inputs from each of the microphones are determined. The right and left weightings correspond to preferred directive patterns for stereo input of the ... 06/28/07 - 20070147633 - Listening device with two or more microphones The invention regards a listening device with two or more microphone units. The listening device has a signal processing device and means for delivering a signal to the user of the device representative of the audio signals picked up by the microphones, whereby the signal processing device comprises means for ... 06/07/07 - 20070127736 - Handsfree system for use in a vehicle The invention is directed to a handsfree system for use in a vehicle comprising a microphone array with at least two microphones and a signal processing means wherein the signal processing means comprises the superdirective beamformer with fixed superdirective filters. ... 05/24/07 - 20070116300 - Channel decoding for wireless telephones with multiple microphones and multiple description transmission An embodiment of the present invention provides a wireless telephone including a receiver module, a channel decoder, a speech decoder, and a speaker. The receiver module receives a plurality of versions of a voice signal, wherein each version of the voice signal comprises a plurality of speech frames. The channel ... 04/19/07 - 20070086602 - System and method for matching microphones This invention relates to a system (10) and method for matching one or more microphones. A first and second microphone (110, 210) communicates, respectively, a first and second microphone signal to an amplitude compensating means (16) adjusting amplitude of the first microphone signal in accordance with amplitude of the second ... 04/05/07 - 20070076901 - Adapting a directional microphone signal to long-lasting influences The directional effect of a static directional microphone is to be improved. In particular shadowing effects of the head for a hearing device worn on the head of the user are to be taken into account when adjusting at the directional microphone. To this end it is proposed that—like the ... 04/05/07 - 20070076900 - Microphone calibration with an rgsc beamformer It is intended to improve and automate the calculation of calibration filters connected downstream from the microphones of an RGSC beamformer. To this end it is proposed that an adaptive calibration filter calculation unit be used, by means of which calibration filters are calculated from the output signals of adaptive ... 04/05/07 - 20070076899 - Audio collecting device by audio input matrix An audio collecting device by audio input matrix comprises: a plurality of audio input devices for inputting audio sources and generating a plurality of audio signals; a plurality of sub-processors for connecting with a plurality of audio input devices to process the audio signals and generate audio processing signals of ... 04/05/07 - 20070076898 - Adaptive beamformer with robustness against uncorrelated noise The relatively robust adaptive beamformer, comprises: a filtered sum beamformer (107) to process input audio signals (u1, u2, u3) from an array of respective microphones (101, 103, 105), and arranged to yield as an output a first audio signal (z) predominantly corresponding to sound from a desired audio source (160); ... 03/22/07 - 20070064960 - Apparatus to convert analog signal of array microphone into digital signal and computer system including the same An apparatus to convert analog signals of an array microphone into digital signals, and a computer system including the same including a first unit that receives and amplifies a plurality of analog signals of the array microphone, a second unit that converts the amplified analog signals into a plurality of ... 03/22/07 - 20070064959 - Microphone system The invention relates to a method and a system for achieving increased directivity in listening situations where at least one microphone (1, 2, 3) is embedded in a first structure (11) and at least one microphone (4) is embedded in a second structure (10), the first and the second structure ... 03/08/07 - 20070053524 - Method and system for communication enhancement in a noisy environment The invention is directed to a method comprising receiving input signals emanating from at least two microphone arrays each comprising at least two microphones, processing the input signals of each microphone array by a beamformer to determine temporal and spatial information about the input signals of each microphone array. ... 03/01/07 - 20070047743 - Method and apparatus for improving noise discrimination using enhanced phase difference value Noise discrimination in signals from a plurality of sensors is conducted by enhancing the phase difference in the signals such that off-axis pick-up is suppressed while on-axis pick-up is enhanced. Alternatively, attenuation/expansion are applied to the signals in a phase difference dependent manner, consistent with suppression of off-axis pick-up and ... 03/01/07 - 20070047742 - Method and system for enhancing regional sensitivity noise discrimination Noise discrimination in signals from a plurality of sensors is conducted by enhancing the phase difference in the signals such that off-axis pick-up is suppressed while on-axis pick-up is enhanced. Alternatively, attenuation/expansion are applied to the signals in a phase difference dependent manner, consistent with suppression of off-axis pick-up and ... 02/01/07 - 20070025562 - Methods and apparatus for targeted sound detection Targeted sound detection methods and apparatus are disclosed. A microphone array has two or more microphones M0 . . . MM. Each microphone is coupled to a plurality of filters. The filters are configured to filter input signals corresponding to sounds detected by the microphones thereby generating a filtered output. ... 01/18/07 - 20070014419 - Method and apparatus for producing adaptive directional signals The invention relates to adaptive directional systems, and more particularly to a method and apparatus for producing adaptive directional signals. The invention may be applied to the provision of audio frequency adaptive directional microphone systems for devices such as hearing aids and mobile telephones. The method involves constructing the adaptive ... 01/04/07 - 20070003074 - Method and device for separating of sound signals generating a signal spectrum (S) of a signal to be output by correlating one of the two frequency spectra (M1, M2) with a filter function (F0) which is selected so that acoustic signals from an area (γ3db) around a preferred angle of incidence (0) are amplified relative to acoustic signals ... 12/21/06 - 20060285699 - Apparatus, system and method for capturing sound A sound capture apparatus with first and second omnidirectional acoustic transducers mounted at a separation distance to simulate a manner by which sound waves propagate around a human head. The apparatus also includes an arrangement for amplifying the output of each transducer. The amplifying arrangement is mounted within a housing ... 11/30/06 - 20060269080 - Hybrid beamforming A system such as a speakerphone may include a processor, memory and an array of microphones. The processor may be configured (via program instructions stored in the memory) to perform automatic echo cancellation, self calibration and beam forming. In particular, the processor may receive input signals from the microphone array ... 11/23/06 - 20060262943 - Forming beams with nulls directed at noise sources A communication system (e.g., a speakerphone) includes an array of microphones, a speaker, memory and a processor. The processor may perform a virtual broadside scan on the microphone array and analyze the resulting amplitude envelope to identify acoustic source angles. Each of the source angles may be further investigated with ... 11/16/06 - 20060256976 - Spatial array monitoring system A compact portable spatial array sound reproduction system employs a plurality of identical speakers coupled to a mechanical assembly that situates the speakers at a known, fixed distance from each other as well as a central listening point. The speakers can be coupled to a multi-channel amplifier that can be ... 11/16/06 - 20060256975 - Deconvolution methods and systems for the mapping of acoustic sources from phased microphone arrays A method and system for mapping acoustic sources determined from a phased microphone array. A plurality of microphones are arranged in an optimized grid pattern including a plurality of grid locations thereof. A linear configuration of N equations and N unknowns can be formed by accounting for a reciprocal influence ... 11/02/06 - 20060245601 - Robust localization and tracking of simultaneously moving sound sources using beamforming and particle filtering The present invention relates to a system for localizing at least one sound source, comprising a set of spatially spaced apart sound sensors to detect sound from the at least one sound source and produce corresponding sound signals, and a frequency-domain beamformer responsive to the sound signals from the sound ... 10/26/06 - 20060239471 - Methods and apparatus for targeted sound detection and characterization Sound processing methods and apparatus are provided. A sound capture unit is configured to identify one or more sound sources. The sound capture unit generates data capable of being analyzed to determine a listening zone at which to process sound to the substantial exclusion of sounds outside the listening zone. ... 10/26/06 - 20060239470 - Support assemblies with rotation adjustment and associated methods A speaker aiming system in accordance with one embodiment includes a speaker portion movable relative to a support portion, and a rotation adjustment device coupled to the speaker portion for rotation of the speaker portion relative to the support portion in first and second directions. The rotation adjustment device has ... 10/19/06 - 20060233389 - Methods and apparatus for targeted sound detection and characterization Targeted sound detection methods and apparatus are disclosed. A microphone array has two or more microphones M0 . . . MM. Each microphone is coupled to a plurality of filters. The filters are configured to filter input signals corresponding to sounds detected by the microphones thereby generating a filtered output. ... 10/12/06 - 20060227980 - Systems and methods for producing a sound pressure field The invention provides, in various embodiments, a transducer for generating hyper-directional sound beams, and a system and method employing a hyper-directional sound transducer for producing pressure gradients and forces across stationary and moving objects. ... 10/05/06 - 20060222187 - Microphone and sound image processing system A system and associated methods for processing three-dimensional audio information for surround or stereo applications include a microphone assembly having three substantially coincident microphone elements. The microphone elements include one bidirectional-pattern microphone and two unidirectional microphones. The unidirectional-pattern microphones may generally face front and rear directions and align substantially with ... 09/28/06 - 20060215850 - System and process for robust sound source localization A system and process for finding the location of a sound source using direct approaches having weighting factors that mitigate the effect of both correlated and reverberation noise is presented. When more than two microphones are used, the traditional time-delay-of-arrival (TDOA) based sound source localization (SSL) approach involves two steps. ... 09/28/06 - 20060215849 - Locating and tracking acoustic sources with microphone arrays A method constructs a location model for locating and tracking sources of acoustic signals. Acoustic training signals are acquired from an acoustic training source at an unknown location in an environment with an array of microphones placed at unknown positions in the environment. From each acoustic training signal, relative acoustic ... 09/14/06 - 20060204019 - Acoustic signal processing apparatus, acoustic signal processing method, acoustic signal processing program, and computer-readable recording medium recording acoustic signal processing program A frequency decomposer analyzes two amplitude data input from microphones to an acoustic signal input unit, and a two-dimensional data forming unit obtains a phase difference between the two amplitude data for each frequency. This phase difference for each frequency is given two-dimensional coordinate values to form two-dimensional data. A ... 09/07/06 - 20060198537 - Ultra-directional microphones Some embodiments provides a highly directional audio response that is flat over five octaves or more by the use of multiple colinear arrays followed by signal processing. Each of the colinear arrays has a common center, but a different spacing so that it can be used for a different frequency ... 09/07/06 - 20060198536 - Microphone array signal processing apparatus, microphone array signal processing method, and microphone array system A microphone array signal processing apparatus which is capable of picking up sound in a low frequency band even with a compact microphone array. The microphone array signal processing apparatus is comprised of delay devices (411-1 to 411-M) that add delays to the respective ones of a plurality of sound ... 08/24/06 - 20060188111 - Microphone apparatus A microphone apparatus for processing and outputting an output signal of a microphone array including at least nine microphones includes a directivity function processing circuit that converts the output signal of the microphone array into a unidirectional signal and that outputs the unidirectional signal. The directivity function processing circuit expands ... 08/03/06 - 20060171547 - Method for reproducing natural or modified spatial impression in multichannel listening The invention concerns a method for reproducing spatial impression of existing spaces in multichannel or binaural listening. It consists of following steps/phases: a) Recording of sound or impulse response of a room using multiple microphones, b) Time-and frequency-dependent processing of impulse responses or recorded sound, c) Processing of sound to ... 07/20/06 - 20060159281 - Method and apparatus to record a signal using a beam forming algorithm A method and an apparatus to record an audio signal use a beam forming algorithm for at least two microphones. The method includes disposing a plurality of microphones at a plurality of predetermined locations to generate audio signals upon receiving a sound signal output from a sound source, forming a ... 07/13/06 - 20060153399 - Method and apparatus for ambient sound therapy user interface and control system Method and apparatus comprising a method of recording natural sounds with a matched microphone array, recording the signal on a high resolution recording device including creating an audio bed, and playing back the recording on a tuned playback system. The method and apparatus is used to create or duplicate an ... 07/06/06 - 20060147054 - Microphone non-uniformity compensation system A microphone compensation system responds to changes in the characteristics of individual microphones in an array of microphones. The microphone compensation system provides a communication system with consistent performance despite microphone aging, widely varying environmental conditions, and other factors that alter the characteristics of the microphones. Furthermore, lengthy, complex, and ... 06/29/06 - 20060140417 - Method and apparatus for audio signal enhancement A method for audio signal enhancement comprising obtaining (222) a first audio signal from a first physical microphone element and obtaining a second audio signal from a second physical microphone element. The audio signals are array processed (226) to generate a virtual linear first order element and a virtual non-linear ... 06/22/06 - 20060133623 - System and method for microphone gain adjust based on speaker orientation A system and method for automatically adjusting the gain of an audio system as a speaker's head moves relative to a microphone includes using a video of the speaker to determine an orientation of the speaker's head relative to the microphone and, hence, a gain adjust signal. The gain adjust ... 06/22/06 - 20060133622 - Wireless telephone with adaptive microphone array A wireless telephone having an array of microphones and a digital signal processor (DSP) and a method of processing audio signals from a wireless telephone having an array of microphones and a DSP. The wireless telephone includes an array of microphones and a DSP. Each microphone in the array is ... 06/22/06 - 20060133621 - Wireless telephone having multiple microphones The present invention is directed to a wireless telephone having a first microphone and a second microphone and a method for processing audio signal in a wireless telephone having a first microphone and a second microphone. The wireless telephone includes a first microphone, a second microphone, and a signal processor. ... 06/01/06 - 20060115097 - Microphone system with directional response Hearing aid with a microphone system for providing a directional response by generating a fixed forward pointing directivity pattern and a fixed backward pointing directivity pattern and where the forward and backward directivity pattern signals are mixed at a ratio, which ensures energy minimization of the output signal, and where ... 05/18/06 - 20060104459 - Method for reducing interferences of a directional microphone The interference powers with directional microphones are to be suppressed as far as possible. To this end, provision is made to adaptively filter the microphone of a number of microphones as a function of at least one parameter. The directional effect of the directional microphone achieved in this way is ... 05/18/06 - 20060104458 - Video and audio conferencing system with spatial audio In some embodiments, spatially realistic audio may be provided for a conference call. Voices from participants on the left side of a display, in a conference call, may be directed through audio on the left side of the display at the other conferencing system in the conference call (similarly for ... 05/11/06 - 20060098826 - Method and system for amplifying auditory sounds This invention relates to a system for amplifying a sound in an auditory environment. The system comprises a microphone for transforming said sound to an electric sound signal; a band-pass filtering means connecting to said microphone and outputting a filtered sound signal; and an amplifier amplifying said filtered sound signal ... 04/27/06 - 20060088173 - Ceiling microphone assembly An overhead microphone assembly using multiple unidirectional microphone elements. The microphone assembly is installed overhead, generally above all the desired sound sources and below the undesired sound sources. The signals from these multiple microphone elements are fed into a microphone steering processor which can mix and gate the signals to ... 04/20/06 - 20060083390 - Microphone system having pressure-gradient capsules A microphone system may include a housing having a housing opening. Pressure-gradient capsules may be provided in the housing. The capsules may include a diaphragm and at least one sound entry opening. One sound entry opening may be connected with a front side of the diaphragm in an acoustically conductive ... 04/20/06 - 20060083389 - Speakerphone self calibration and beam forming A communication system includes a set of microphones, a speaker, memory and a processor. The processor is configured to operate on input signals from the microphones to obtain a resultant signal representing the output of a virtual microphone which is highly directed in a target direction. The processor also is ... 03/30/06 - 20060067540 - Method for signal nonlinear distortion detection and adaptive gain control An apparatus includes a microphone to generate a voice signal. The apparatus further includes an adjustable gain circuit coupled to the microphone to selectively apply a gain to the voice signal. In addition the apparatus includes an analog front end circuit coupled to the adjustable gain circuit to transmit the ... 03/02/06 - 20060045289 - Sound collection system Collecting the sound while rotating at least one or more microphone around a rotational axis, the filter processing is carried out in accordance with the positional information of the microphone at each point. ... 01/05/06 - 20060002570 - Noise canceling microphone An improved noise canceling microphone is provided including robust design features and advanced noise control and speech discrimination convergence characteristics. Two adaptive controllers are used to ensure robust performance in quickly changing acoustic environments ensuring an acceptable minimum performance characteristic. Additionally, a new real-time spectral estimation procedure is applied to ... 12/22/05 - 20050281415 - Microphone array processing system for noisy multipath environments Apparatus and a corresponding method for processing speech signals in a noisy reverberant environment, such as an automobile. An array of microphones (10) receives speech signals from a relatively fixed source (12) and noise signals from multiple sources (32) reverberated over multiple paths. One of the microphones is designated a ... 12/15/05 - 20050276423 - Method and device for receiving and treating audiosignals in surroundings affected by noise In order to record and to process audio signals with a good useful-signal to noise-signal ratio in acoustic noise conditions and with a good ratio between the direct sound and the reflected sound in an environment which in particular has no reverberation electrical signals produced by conversion of audio signals ... 12/08/05 - 20050271221 - Airborne collection of acoustic data using an unmanned aerial vehicle An acoustic data collection system that uses an antenna array aboard a powered unmanned and remotely controlled parafoil. The antenna array has multiple microphone elements, whose outputs are combined to provide directionality to the data acquisition. ... 12/08/05 - 20050271220 - Virtual microphones in electronic conferencing systems Disclosed herein are electronic conferencing systems that support audio conversations between local and remote participants. Further disclosed herein are methods for combining several microphones to form virtual microphones and conference pods that utilize those methods. Detailed information on various example embodiments of the inventions are provided in the Detailed Description ... 12/01/05 - 20050265563 - Method for analyzing an acoustical environment and a system to do so Acoustical signals are registered at two locations to generate two electric signals. Based on the electric signals, the distance from one of the locations to the source of the acoustical signal is calculated to generate a distance signal. The distance signal is amplitude filtered to generate a patterned distance signal. ... 12/01/05 - 20050265562 - System and process for locating a speaker using 360 degree sound source localization A system and process is described for estimating the location of a speaker using signals output by a microphone array characterized by multiple pairs of audio sensors. The location of a speaker is estimated by first determining whether the signal data contains human speech components and filtering out noise attributable ... 11/24/05 - 20050259832 - Sound pickup method and apparatus, sound pickup and reproduction method, and sound reproduction apparatus A sound is picked up using a plurality of microphones that are arranged so that respective directivity axes of the microphones differ from each other or so that they function as a plurality of microphones having directivities in different directions by performing a calculation on sound signals output from the ... 11/10/05 - 20050249361 - Selective shaping of communication signals Angular discrimination between signals is described. Multiple signals are sampled with multiple signal sensors spatially separated from each other. Respective transform signals are determined that are representative of each sampled signal. If a difference between the transform signals in a given transform kernel bin is greater than a difference threshold, ... 11/10/05 - 20050249360 - Systems and methods for microphone localization Systems and methods determine the location of a microphone with an unknown location, given the location of a number of other microphones by determining a difference in an arrival time between a first audio signal generated by and microphone with a known location and a second audio signal generated by ... 11/10/05 - 20050249359 - Automatic microphone matching Signals dependent on the electrical output signals of two acoustical to electrical converters are computed to result in a result signal. A transfer characteristic between an acoustical signal impinging on the converters and the result signal is dependent on the arrival direction of the acoustical signals at the converters. The ... 11/03/05 - 20050244018 - Method and device for matching the phases of microphone signals of a directional microphone of a hearing aid The phase differences of microphones of a hearing aid microphone are to be reduced. To do this, the level of an output signal (y1(t)) of a directional microphone is compared with an omnidirectional signal (y1′(t)). If the level of the output signal of the differential directional microphone (y1(t)) is above ... 10/20/05 - 20050232442 - Microphone system A system remotely controls a microphone through a remote control unit. The remote control unit includes a frequency modulator that modulates a control signal. A cable conductor that is used to provide phantom power also conveys a frequency-modulated control signal. The frequency-modulated control signal and audio signals may be separated. ... 10/20/05 - 20050232441 - Method for optimal microphone array design under uniform acoustic coupling constraints A method of designing a beamformer, and a beamformer made in accordance with this method, characterized by a uniform speakerphone response condition, resulting in optimal beamforming directivity under a uniform coupling constraint. According to the present invention, a finite number of individual beamformers are constrained to have the same response ... 10/20/05 - 20050232440 - Stationary spectral power dependent audio enhancement system An audio enhancement system (1) for speech recognition or voice control is described, comprising a signal input for carrying a distorted desired signal (z), a reference signal input, and a spectral processor (SP) coupled to both signal inputs for processing the distorted desired signal (z) by means of a reference ... 09/22/05 - 20050207591 - Audio input unit, audio input method and audio input and output unit A videoconferencing system uses an audio input unit including: two directional microphones disposed in directions with directivity being opposite to each other, the microphones forming a pair and a plurality of the pairs being located with directivity shifted from each other, cancellation elements for canceling sound components of the same ... 09/08/05 - 20050195990 - Method and apparatus for separating sound-source signal and method and device for detecting pitch In a sound-source signal separating method, a target sound-source signal in an input audio signal is enhanced, the input audio signal being from a mixture of acoustic signals from a plurality of sound sources picked up by a plurality of sound pickup devices. The pitch of the target sound-source signal ... 09/08/05 - 20050195989 - Robot A robot includes first and second microphones and movable portions. The first microphone gathers a first sound reception signal by gathering mainly a target signal. The second microphone gathers a second reception sound signal by gathering mainly noise other than the target signal. The movable portions operate on the basis ... 09/08/05 - 20050195988 - System and method for beamforming using a microphone array The ability to combine multiple audio signals captured from the microphones in a microphone array is frequently used in beamforming systems. Typically, beamforming involves processing the output audio signals of the microphone array in such a way as to make the microphone array act as a highly directional microphone. In ... 08/18/05 - 20050180582 - A system and method for utilizing disjoint audio devices A communication system is provided including an audio server including an audio server communicator, and a multi-aural filter, and at least one audio device including a microphone set having at least one microphone for audio acquisition of a multi-channel audio signal, and an audio device communicator for communication with the ... 08/18/05 - 20050180581 - Integrated microphone array A microphone for detecting vibrations at two or more locations on a surface such as a body surface. The microphone comprises two or more vibration sensors, where each vibration sensor has a diaphragm. The diaphragms are arranged in an overlapping array so that vibrations at at least one location on ... 08/11/05 - 20050175190 - Self-descriptive microphone array A self-descriptive microphone array includes a microphone array memory, such as, for example a ROM, EEPROM, or other conventional memory, which contains a microphone array device description. This device description includes parametric information which defines operational characteristics and configuration of the microphone array. In further embodiments, the microphone array uses ... 08/11/05 - 20050175189 - Dual microphone communication device for teleconference A dual microphone communication device comprising a first microphone module, a second microphone module and a mixer circuit is provided. The first microphone module amplifies a near-end audio signal to produce a first audio signal. The second microphone module receives and amplifies the near-end audio signal by a fixed gain ... 08/04/05 - 20050169487 - Directional microphone array system A directional microphone array system generally for hearing aid applications is disclosed. The system may employ a broadside or an endfire array of microphones. In either case, the signals generated by the microphone are added using a plurality of summation points that are connected together via a single signal wire ... 07/28/05 - 20050163330 - Acoustic measuring system for locating noise sources This system has a plurality of microphones (3) oriented in several directions and mounted in a support (2) so that each one is flush with or disposed on a rigid surface, the various microphones (3) being connected to a signal processing device that processes the signals coming from the microphones ... 07/21/05 - 20050157890 - Noise reducing device The present invention provides an active control type noise reducing device that is disposed at a sound barrier and with which can be obtained an excellent noise reduction effect with respect to moving sound sources. Linear array of flat loudspeakers are arranged in ascending order from an incoming side of ... 07/07/05 - 20050147261 - Head relational transfer function virtualizer Sound and the spatial location of the sound relative to a microphone array are sensed and derived respectively and transmitted to a sound reproducing system that uses the sound as a monaural stream and shapes the monaural stream according to channels using time delays, attenuation, reverberation, and filters that represent ... 06/23/05 - 20050135637 - Intelligibility measurement of audio announcement systems A measurement system and method combine an audio announcement system with a plurality of spaced apart sensors to evaluate intelligibility of audio output from loudspeakers of the audio announcement system. Processing can take place at some or all of the sensors as well as at a common control element. Evaluations ... 06/09/05 - 20050123149 - Audio system based on at least second-order eigenbeams A microphone array-based audio system that supports representations of auditory scenes using second-order (or higher) harmonic expansions based on the audio signals generated by the microphone array. In one embodiment, a plurality of audio sensors are mounted on the surface of an acoustically rigid sphere. The number and location of ... ### FreshPatents.com Support |