Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 3 - Circuits for transducers
Patents for H04R 3 - Circuits for transducers (18,190)
08/2003
08/21/2003WO2003028406A3 Method and apparatus for determining a nonlinear response function for a loudspeaker
08/21/2003WO2002028140A3 Second order microphone array
08/21/2003US20030157965 Reception system for multisensor antenna
08/21/2003US20030156728 Speaker-use protection element and speaker device
08/21/2003US20030156725 Hearing aid comprising an array of microphones
08/21/2003US20030156723 Process and apparatus for eliminating loudspeaker interference from microphone signals
08/21/2003US20030156711 Echo processing apparatus
08/20/2003CN2567897Y Sound signal treatment device of ear muffs
08/19/2003US6608907 Audio output apparatus having wireless speakers
08/19/2003US6608906 Cooling fan control strategy for automotive audio system
08/19/2003US6608904 Method and apparatus for canceling interference in a loudspeaker communication path through adaptive discrimination
08/19/2003US6608903 Sound field reproducing method and apparatus for the same
08/14/2003WO2003067924A1 Electret capacitor microphone
08/14/2003WO2003067922A2 Reducing noise in audio systems
08/14/2003WO2003065950A1 Method and apparatus for communication operator privacy
08/14/2003WO2003024152A3 Listening device
08/14/2003WO2002058432A3 Acoustic source localization system and method
08/14/2003US20030152240 Method and apperatus for communcation operator privacy
08/14/2003DE20307781U1 Correction circuit for sound transducer, e.g. loudspeaker, has series combination(s) of resistance value, capacitive value and inductive value in parallel with sound transducer
08/13/2003CN1436436A Method and apparatus for voice signal extraction
08/13/2003CN1118179C Echo removing apparatus
08/07/2003WO2003065764A1 Voice activity detector for telephone
08/07/2003WO2003065761A1 Modular loudspeaker
08/07/2003WO2003065570A2 Modulator- amplifier
08/07/2003WO2002080615A3 Ear microphone apparatus and method
08/07/2003US20030149362 Ultrasonic imaging apparatus and method
08/07/2003US20030147540 Microphone emulation
08/07/2003US20030147539 Audio system based on at least second-order eigenbeams
08/07/2003US20030147538 Reducing noise in audio systems
08/07/2003CA2474257A1 Modulator- amplifier
08/06/2003EP1332644A1 Portable multi-channel amplifier
08/05/2003US6603863 Headphone apparatus for providing dynamic sound with vibrations and method therefor
08/05/2003US6603858 Multi-strategy array processor
08/05/2003US6603353 Switching power amplifier
07/2003
07/31/2003WO2003063481A1 Method for processing audio signals and audio processing system for applying this method
07/31/2003US20030144838 Method for identifying a momentary acoustic scene, use of the method and hearing device
07/31/2003US20030142836 Microphone array having a second order directional pattern
07/31/2003US20030142835 Sound output apparatus for an automotive vehicle
07/31/2003US20030142831 Voice activity detector for telephone
07/30/2003CN2563876Y 录音电路 Recording Circuit
07/30/2003CN1433661A Piezoelectric film sonic emitter
07/30/2003CN1116737C User adjustable volume control that accommodates hearing
07/29/2003US6600824 Microphone array system
07/24/2003WO2003061344A2 Multichannel echo canceller system using active audio matrix coefficients
07/24/2003WO2003061336A1 Audio system based on at least second-order eigenbeams
07/24/2003WO2003061167A2 Digital linking of multiple microphone systems
07/24/2003US20030138119 Digital linking of multiple microphone systems
07/24/2003US20030138118 Method for control of a unit comprising an acoustic output device
07/24/2003US20030138116 Interference suppression techniques
07/24/2003US20030138115 Cooling fan control strategy for automotive audio system
07/24/2003US20030138112 Single supply headphone driver/charge pump combination
07/23/2003EP1252796B1 System and method for dual microphone signal noise reduction using spectral subtraction
07/23/2003EP1142446B1 Speaker system
07/23/2003CN1115663C Audio process arrangement with multiple sources
07/23/2003CN1115662C Karaoke equipment
07/22/2003US6597301 Apparatus and method for level-dependent companding for wireless audio noise reduction
07/22/2003US6597241 High performance audio transmission channel
07/17/2003WO2003058606A1 Translation device with planar microphone array
07/17/2003WO2002015639A3 Loudspeaker having adjustable motor strength
07/17/2003US20030133579 Electromagnetic feedback reduction in communication device
07/17/2003US20030133577 Microphone unit and sound source direction identification system
07/15/2003US6594367 Super directional beamforming design and implementation
07/15/2003US6594198 Digital signal demodulator calibration system and method for optical hydrophones
07/15/2003US6593956 Locating an audio source
07/10/2003WO2003056875A1 Sound effects microphone
07/10/2003WO2003056874A1 Echo-eliminating microphone
07/10/2003US20030128850 Loudspeaker broadcasting system and loudspeaker broadcasting apparatus
07/10/2003US20030126975 Electronic musical instrument
07/10/2003CA2469448A1 Sound effects microphone
07/10/2003CA2469447A1 Echo-eliminating microphone
07/09/2003EP1325727A2 Simulated wave massage
07/09/2003EP1020028B1 Device for separation of signals
07/09/2003EP0990369B1 Sound reproduction system
07/08/2003US6590984 Sound quality regulation apparatus
07/03/2003WO2003055112A1 Microphone apparatus built in computer network
07/03/2003US20030125959 Translation device with planar microphone array
07/03/2003US20030123681 High efficiency driver for miniature loudspeakers
07/03/2003US20030123673 Electronic sound equipment
07/03/2003US20030122658 Compound acoustic actuator drive circuit and portable information terminal
07/03/2003US20030122167 Semiconductor device
07/03/2003US20030121403 Electronic tone generating apparatus and signal-processing-characteristic adjusting method
07/02/2003CN1113568C Mobile telephone set with amplified listening
07/02/2003CN1113493C Electronic circuits having noise eliminating element
07/02/2003CA2415066A1 Simulated wave massage
07/01/2003US6587571 Speaker
07/01/2003US6587569 Differential-pressure microphone
07/01/2003US6587566 Sound field forming circuit and sound field forming apparatus
06/2003
06/26/2003WO2003053033A1 Echo canceller having spectral echo tail estimator
06/26/2003WO2003052736A1 Apparatus for focussing ultrasonic acoustical energy within a liquid stream
06/26/2003WO2002065735A3 Vehicle accessory microphone
06/26/2003US20030118201 Method and system for using an audio transducer as both an input and output device in full duplex operation
06/26/2003US20030118200 System and method of indicating and controlling sound pickup direction and location in a teleconferencing system
06/26/2003US20030118197 Communication system using short range radio communication headset
06/25/2003EP1169884B1 Flat surface loudspeaker and method for operating the same
06/25/2003CN1426667A Directional processing for multi-microphone system
06/25/2003CN1112761C Apparatus for compensating frequency characteristic of reproduction audio signal
06/24/2003US6584206 Speaker apparatus
06/24/2003US6584205 Modulator processing for a parametric speaker system
06/24/2003US6584204 Loudspeaker system with feedback control for improved bandwidth and distortion reduction
06/24/2003US6584203 Second-order adaptive differential microphone array
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