| Patents for H04R 3 - Circuits for transducers (18,190) |
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| 06/04/1997 | EP0777403A2 A system of sound diffusion, particularly for large spaces |
| 05/28/1997 | EP0685133A4 Voice transmission systems with voice cancellation. |
| 05/27/1997 | US5633935 Stereo ultradirectional microphone apparatus |
| 05/21/1997 | CN2254610Y Large power audio power amplifier |
| 05/14/1997 | EP0772764A1 Process and device for determining the tonality of an audio signal |
| 05/14/1997 | CN1149441A Forming method for sound source of audimeter |
| 05/13/1997 | US5629987 Loudspeaker system with closed housing for improved bass reproduction |
| 05/09/1997 | WO1997016942A1 Method and apparatus for reduction of unwanted feedback |
| 05/07/1997 | EP0772374A2 Method and apparatus for controlling the performance of a loudspeaker in a room |
| 05/07/1997 | EP0771515A2 Signal amplification system with automatic equalizer |
| 05/07/1997 | DE19540795A1 Speaker location method using microphone array |
| 05/06/1997 | US5627899 Compensating filters |
| 05/06/1997 | US5627799 Beamformer using coefficient restrained adaptive filters for detecting interference signals |
| 05/06/1997 | CA2069356C Adjustable filter for differential microphones |
| 04/29/1997 | US5625699 Speaker device |
| 04/29/1997 | US5625698 Loudspeaker and design methodology |
| 04/29/1997 | US5625697 Microphone selection process for use in a multiple microphone voice actuated switching system |
| 04/29/1997 | US5625696 Six-axis surround sound processor with improved matrix and cancellation control |
| 04/24/1997 | DE19538880A1 Channel correction for microphone array |
| 04/23/1997 | EP0769874A1 Audio amplifier arrangement for more than two reproduction channels |
| 04/15/1997 | US5621801 Reverberation effect imparting system |
| 04/15/1997 | US5621724 Echo cancelling device capable of coping with deterioration of acoustic echo condition in a short time |
| 04/09/1997 | EP0767569A1 Method and device for adaptive identification and related adaptive echo canceller |
| 04/09/1997 | EP0645070B1 Stereophonic sound reproduction device using several loudspeakers in each channel |
| 04/08/1997 | US5619582 Enhanced concert audio process utilizing a synchronized headgear system |
| 04/08/1997 | US5619580 Hearing aid compensating for acoustic feedback |
| 04/02/1997 | EP0766494A1 Digital microphonic device |
| 04/02/1997 | EP0765562A1 Adaptive microphone arrangement and method for adapting to an incoming target-noise signal |
| 04/01/1997 | US5617477 Personal wearable communication system with enhanced low frequency response |
| 03/27/1997 | WO1997011538A1 An adaptive filter for signal processing and method therefor |
| 03/27/1997 | WO1997011533A1 A directional acoustic signal processor and method therefor |
| 03/26/1997 | EP0765067A2 Loop gain processing system for speakerphone applications |
| 03/25/1997 | US5615272 Single loud speaker drive system |
| 03/25/1997 | US5615229 Short range inductively coupled communication system employing time variant modulation |
| 03/25/1997 | CA2107320C Audio signal processing apparatus with optimization process |
| 03/18/1997 | US5612996 Loop gain processing system for speakerphone applications |
| 03/13/1997 | WO1997009847A1 Panel-form loudspeakers |
| 03/13/1997 | WO1997009842A2 Acoustic device |
| 03/13/1997 | WO1997009698A1 A vending machine |
| 03/13/1997 | CA2230701A1 Panel-form loudspeakers |
| 03/13/1997 | CA2230459A1 A vending machine |
| 03/12/1997 | EP0761074A1 Self-damping speaker matching device and method |
| 03/12/1997 | EP0760996A1 Multimedia personal computer with active noise reduction and piezo speakers |
| 03/12/1997 | CN2249477Y Low-distortion loud-speaker driving device |
| 03/11/1997 | US5610991 Noise reduction system and device, and a mobile radio station |
| 03/11/1997 | US5610909 Multistage echo canceler including time variation compensation |
| 03/05/1997 | CN1144433A TV set capable of display voice frequency balancing regulation data |
| 03/01/1997 | CA2183385A1 Reversed phase audio frequency dividing circuit |
| 02/25/1997 | US5606643 Real-time audio recording system for automatic speaker indexing |
| 02/25/1997 | US5606607 Two-way communications earset |
| 02/18/1997 | US5604813 Industrial headset |
| 02/18/1997 | CA2099575C Adaptive acoustic echo canceller |
| 02/11/1997 | US5602962 Mobile radio set comprising a speech processing arrangement |
| 02/05/1997 | EP0756741A1 Methods and apparatus for adaptive beamforming |
| 02/04/1997 | US5600727 Determination of position |
| 02/04/1997 | US5600718 Apparatus and method for adaptively precompensating for loudspeaker distortions |
| 01/30/1997 | WO1997003536A1 Loudspeaker circuit with means for monitoring the pressure at the speaker diaphragm, means for monitoring the velocity of the speaker diaphragm and a feedback circuit |
| 01/29/1997 | EP0756407A2 Noise controlled type handset |
| 01/28/1997 | US5598507 Method of speaker clustering for unknown speakers in conversational audio data |
| 01/28/1997 | US5598480 Multiple output transformer network for sound reproducing system |
| 01/28/1997 | US5598468 Method and apparatus for echo removal in a communication system |
| 01/23/1997 | WO1997002719A1 Audio signal reproduction apparatus |
| 01/22/1997 | EP0755166A2 Apparatus with active noise compensation |
| 01/22/1997 | CN1140968A Headphone reproducing apparatus |
| 01/21/1997 | US5596648 Infrared audio transmitter system |
| 01/15/1997 | CN1140516A Wireless digital communication system, radio apparatus, digital speaker, and digital speaker controlling apparatus |
| 01/14/1997 | US5594494 Moving picture coding apparatus |
| 01/09/1997 | WO1996032776A3 Signal amplification system with automatic equalizer |
| 01/07/1997 | US5592559 Speaker driving circuit |
| 01/07/1997 | US5592558 Sound reproduction device |
| 01/02/1997 | EP0578744A4 Minimum wire interface for multiple accessories |
| 12/31/1996 | US5590207 Sound reproducing array processor system |
| 12/31/1996 | US5590094 System and methd for reproducing sound |
| 12/24/1996 | US5588065 Bass reproduction speaker apparatus |
| 12/17/1996 | US5586191 Adjustable filter for differential microphones |
| 12/12/1996 | DE19521930A1 Reduction of acoustic feedback and echoes |
| 12/11/1996 | EP0748043A2 Automatic volume control |
| 12/11/1996 | EP0746959A1 Digitally controlled analog cancellation system |
| 12/11/1996 | EP0476082B1 Device for improving bass reproduction in loudspeaker systems with closed housings |
| 12/04/1996 | EP0746133A2 Multistage echo canceller including time variation compensation |
| 12/03/1996 | US5581620 Signal processing apparatus |
| 12/03/1996 | US5581480 Method and apparatus for mixing multiple channels of sampled digital audio using a non-linear clipping function |
| 11/27/1996 | EP0744881A2 Headphone reproducing apparatus |
| 11/26/1996 | US5579397 Amplifier device for a condenser microphone |
| 11/26/1996 | US5579046 Voice filter system for a video camera |
| 11/21/1996 | WO1996036862A1 Intensity acoustic calibrator |
| 11/21/1996 | DE19620010A1 Loudspeaker system with satellite housing |
| 11/21/1996 | CA2221244A1 Intensity acoustic calibrator |
| 11/20/1996 | CN2240818Y Electronic horn for vehicle |
| 11/19/1996 | US5577129 Amplifier circuit for electret condenser microphone |
| 11/19/1996 | US5577126 Overload protection circuit for transducers |
| 11/14/1996 | WO1996036111A1 Audio crossover circuit |
| 11/14/1996 | WO1996036109A1 Distributed self-adjusting master-slave loudspeaker system |
| 11/13/1996 | EP0742679A2 Microphone selection process for use in a multiple microphone voice actuated switching system |
| 11/13/1996 | EP0742664A2 Method for hand-free talking for a multi-channel transmission system |
| 11/13/1996 | CA2176305A1 Hands-free communication method for a multichannel transmission system |
| 11/12/1996 | US5574792 Volume and tone control circuit for acoustic reproduction sets |
| 11/07/1996 | WO1996035314A1 Process for controlling a programmable or program-controlled hearing aid for its in-situ fitting adjustment |
| 11/06/1996 | CN1135120A Bass enhancement circuit |
| 10/31/1996 | WO1996031082A3 Audio bass speaker driver circuit |