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)
09/2000
09/26/2000US6125187 Howling eliminating apparatus
09/26/2000US6123671 Method and apparatus for distributed, agile calculation of beamforming time delays and apodization values
09/21/2000WO2000056119A1 Intelligent speaker training using microphone feedback and pre-loaded templates
09/21/2000WO2000056036A2 Echo suppression device and method for performing the same
09/21/2000WO2000055824A1 A vibrator and a method of controlling a vibrator
09/21/2000WO2000022876A9 Point source speaker system
09/21/2000DE19911969A1 Loudspeaker amplifier unit has signal divider unit, impedance changer and output section
09/20/2000CN1267445A Method for electronically beam forming acoustical signals and acoustical sensor apparatus
09/20/2000CN1267444A Method for electronically selecting dependency of output signal from spatial angle of acoustic signal impingement and hearing aid apparatus
09/19/2000US6122609 Method and device for the optimized processing of a disturbing signal during a sound capture
09/19/2000US6122385 Sound reproduction apparatus with stable feedback
09/19/2000US6122383 Device for reducing noise
09/19/2000US6122381 Stereophonic sound system
09/14/2000WO2000054553A1 Method for shaping the spatial reception amplification characteristic of a converter arrangement and converter arrangement
09/14/2000CA2366992A1 Method for shaping the spatial reception amplification characteristic of a converter arrangement and converter arrangement
09/13/2000EP1035752A1 Method for shaping the spatial reception amplification characteristic of a converter arrangement and converter arrangement
09/13/2000EP1035575A2 Semiconductor device
09/13/2000EP1034689A1 Adaptive acoustic monitor
09/13/2000CN2396595Y Contactless electric horn device
09/13/2000CN1266604A Sound radiating devices
09/08/2000WO2000052959A1 Directional microphone array system
09/06/2000CN2395487Y Processing circuit for automobile sound
09/05/2000US6115475 Capacitor-less crossover network for electro-acoustic loudspeakers
09/05/2000US6113546 Off-aperture electrical connection for ultrasonic transducer
08/2000
08/31/2000WO2000015003A3 Low-frequency audio enhancement system
08/30/2000CN2394380Y Superbass power amplifier
08/30/2000CN2394379Y Superbass power amplifier with regulation of upper limit of frequency spectrum
08/29/2000US6111968 Sound production apparatus
08/29/2000US6111960 Circuit, audio system and method for processing signals, and a harmonics generator
08/29/2000CA2170470C Low frequency audio conversion circuit
08/23/2000CN2393287Y Radio emitting-receiving device for sound signals of audio-visual apparatus
08/22/2000US6108427 Method and apparatus for eliminating audio feedback
08/22/2000US6108426 Audio power management
08/17/2000WO2000048427A2 Method and system of compensating for boundary effects on a primary sound source
08/17/2000WO2000033612A3 Bending wave acoustic devices
08/17/2000DE10005362A1 Sound source detection arrangement in vehicle, has microphone casing
08/16/2000EP1028601A2 Device for capturing sound waves in a vehicle
08/16/2000CN1263426A Voice frequency processing equipment, receiver, filtering and method for recovering useful signal
08/15/2000US6104818 Microphone circuit
08/15/2000US6104817 Speaker and amplifier system
08/09/2000EP1026844A2 Receiver for Digital Audio Broadcast DAB
08/09/2000EP1026663A2 Multiplexed array transducers with improved far-field performance
08/09/2000EP1025806A1 Ultrasonic generator with supervisory control circuitry
08/09/2000EP1025744A1 Hearing aid comprising an array of microphones
08/09/2000CN2391303Y Automatic series attenuator audio protector
08/09/2000CN1262856A Method and apparatus for formating digital audio signal for use of sound reproduction
08/09/2000CN1055367C Pseudo-zero impedance loudspeaking technology and loudspeaking circuit
08/08/2000US6101258 Hearing aid having plural microphones and a microphone switching system
08/03/2000DE10004223A1 Piezoelectric measured value transducer device e.g. for use in oscillators, has AC current generator as trigger circuit connected to control device such that its status changes as sign of operating current changes
08/02/2000EP0864245B1 Method for reproducing ball sounds during a sporting event, and ball therefor
08/01/2000US6097824 Continuous frequency dynamic range audio compressor
07/2000
07/27/2000WO2000044200A1 Intelligent speaker tuning using non-volatile memory
07/26/2000CN1261248A Automatic switching switch of loudspeaker
07/19/2000EP1020028A2 Device for separation of signals
07/18/2000US6091828 Dynamic microphone
07/18/2000US6091812 Apparatus and method for automatically switching a headset between a telephone and a second audio source
07/13/2000WO2000041437A2 Speaker system
07/13/2000WO2000041162A1 Method and apparatus for distributed, agile calculation of beamforming time delays and apodization values
07/13/2000WO2000040997A1 Method and apparatus for coherence imaging
07/12/2000EP1018288A1 Car radio system
07/11/2000US6088459 Loudspeaker system with simulated baffle for improved base reproduction
07/06/2000WO2000019605A3 Band-limited adaptive feedback canceller for hearing aids
07/05/2000EP1017251A2 Acoustic device
07/05/2000EP1017250A1 Sound reproducing device
07/05/2000EP1016314A1 Process and electric appliance for optimising acoustic signal reception
07/05/2000CN1259005A Earphone device for providing dynamic voice with vibration and method for the same device
07/05/2000CN1258962A Electric circuit apparatus for producing output signal
07/05/2000CN1258905A Karaoke equipment
07/05/2000CN1054253C Frequency Q-value balancing method for electric audio system
07/04/2000US6084973 Digital and analog directional microphone
06/2000
06/29/2000DE19861018A1 Gesteuerter akustischer Wellenleiter zur Schalldämpfung Controlled acoustic waveguide for sound attenuation
06/28/2000EP1014571A2 Audio apparatus of negative impedance driving with adaptive gain control
06/28/2000EP1013141A1 Method and device for reproducing a stereophonic audiosignal
06/28/2000EP1013140A1 5-2-5 matrix encoder and decoder system
06/28/2000EP1004204A4 Videoconferencing system with audio source location
06/28/2000CN2385492Y Passive loudspeaker box audio frequency display screen
06/22/2000WO2000036589A1 Controlled acoustic waveguide for soundproofing
06/21/2000CN1053783C Induction type audio-frequency divider
06/15/2000WO2000035247A1 Loudspeaker system with feedback control for improved bandwidth and distortion reduction
06/15/2000WO2000035082A1 Device for amplifying signals
06/15/2000WO2000033634A2 Method for providing the transmission characteristics of a microphone arrangement and microphone arrangement
06/15/2000DE19854373A1 Verfahren zur Steuerung der Empfindlichkeit eines Mikrofons Method for controlling the sensitivity of a microphone
06/14/2000EP1008277A2 Sound pickup device, specially for a voice station
06/08/2000WO2000033612A2 Bending wave acoustic devices
06/08/2000WO2000033610A1 Speaker device
06/08/2000WO2000033292A1 Multielement ultrasonic contact transducer
06/08/2000WO2000018188A3 Public address apparatus
06/07/2000EP1006650A2 BTL amplifier apparatus
06/07/2000EP1005783A1 A method for electronically beam forming acoustical signals and acoustical sensor apparatus
06/07/2000CN2382187Y Multifunctional speaker device with regulatable model and effectness
06/07/2000CN1255821A Echo eliminating device and method thereof
06/06/2000US6072881 Microphone noise rejection system
06/06/2000US6072879 Sound field control unit and sound field control device
06/06/2000US6071240 Method and apparatus for coherence imaging
05/2000
05/31/2000EP1005250A2 Method for controlling the sensitivity of a microphone
05/31/2000EP1004222A1 A distributed stereo system
05/31/2000EP1004204A1 Videoconferencing system with audio source location
05/31/2000DE19951255A1 Elektronisch geregeltes Audiosystem mit Drehknopfregler Electronically controlled audio system with rotary control
05/31/2000DE19937990A1 Integrated semiconductor circuit for electret microphone, has voltage converter and bias voltage circuits for voltage change by change of capacity
05/31/2000CN1255255A Echo reducing phone with state machine controlled switches
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