Patents for H04R 3 - Circuits for transducers (18,190) |
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11/17/1994 | DE4413945A1 Loudspeaker |
11/17/1994 | DE4316098A1 Interference microphone |
11/16/1994 | CN2183064Y Microphone for karaoke |
11/16/1994 | CN1026634C 回声添加电路 Echo adding circuit |
11/11/1994 | CA2095911A1 Monitor receiving system and a monitor receiving device |
11/10/1994 | WO1994026075A1 Tracking platform system |
11/09/1994 | EP0624047A1 Asymmetrical transducing |
11/09/1994 | EP0624046A1 Noise-compensated hands-free communication apparatus in motor vehicles |
11/09/1994 | EP0623395A1 Attenuation circuit for ultrasoundtransducers |
11/08/1994 | US5363434 Audio distribution system |
11/02/1994 | EP0622896A1 Sound system gain and equalization circuit |
11/01/1994 | US5361306 Apparatus and methods for enhancing an electronic audio signal |
11/01/1994 | US5361304 Headphone assemblies |
11/01/1994 | US5361013 Device comprising a piezoelectric transducer |
10/29/1994 | CA2121299A1 Sound system gain and equalization circuit |
10/27/1994 | WO1994024834A1 Hearing aid having a microphone switching system |
10/27/1994 | DE4303360C1 Method for reducing quality losses |
10/26/1994 | EP0621737A1 Stereo ultradirectional microphone apparatus |
10/23/1994 | CA2094667A1 Two-way communications earset with filter |
10/19/1994 | CN2180024Y Voice grade correcting device for karaoke videocorder |
10/18/1994 | US5357251 Electronic filters, signal conversion apparatus, hearing aids and methods |
10/18/1994 | US5357207 Sequential amplifier |
10/13/1994 | WO1994023547A1 A method and a coupling for reducing the harmonic distortion of a capacitive transducer |
10/11/1994 | US5355419 On-vehicle audio system reproducing bodily-sensible sounds |
09/29/1994 | WO1994022275A1 System comprising multiple wireless microphone/transmitter units using a common carrier |
09/29/1994 | DE4410741A1 Connecting device for an audio system in a car |
09/28/1994 | EP0617405A1 Sound field control device |
09/22/1994 | DE4303093A1 Condenser microphone of two transducers having a variable directional pattern |
09/21/1994 | EP0616340A1 A cable for electronic equipment |
09/21/1994 | EP0616313A1 Apparatus for generating a sound based on D/A converted analog signal |
09/21/1994 | CN2178032Y Balance transmission audio frequency dividing apparatus |
09/20/1994 | US5349301 Multiple amplifier system for a car |
09/15/1994 | WO1994021093A1 Process and apparatus for improving the sound reproduction quality of electroacoustic transducers |
09/14/1994 | EP0615387A1 Moving picture encoder |
09/13/1994 | US5347587 Speaker driving device |
09/08/1994 | DE4306667A1 Audio frequency filter |
09/07/1994 | EP0613603A1 A circuit for use with microphones |
09/06/1994 | USH1356 Bomb sensor system |
09/01/1994 | WO1994019894A1 Voice transmission systems with voice cancellation |
08/31/1994 | EP0613319A1 Multimicrophone sound pick-up device and associated signal processing device |
08/31/1994 | EP0613318A1 Microphone apparatus |
08/31/1994 | CN1091579A Karaoke system and method of controlling the same |
08/24/1994 | EP0612059A2 Method for estimating the propagation time in noisy speech channels |
08/24/1994 | CA2112278A1 Noise-reduction system |
08/18/1994 | DE4403723A1 Microphone for a video camera |
08/16/1994 | CA2027138C Loudspeaking telephone station including directional microphone |
08/09/1994 | US5337367 Recording device and video device using the same |
08/03/1994 | CN2173485Y Digital audio frequency synthesis device |
08/03/1994 | CN2173446Y 数字混响背景音乐机 Digital reverb background music machine |
07/26/1994 | US5332928 Battery drain reducer |
07/26/1994 | CA2021676C Communication system with active noise cancellation |
07/21/1994 | WO1994016536A1 Speaker containing dual coil |
07/20/1994 | EP0606387A1 Process and system for sound pick-up, apparatus for sound pick-up and reproduction. |
07/14/1994 | DE4300379A1 HF condenser microphone circuit |
07/13/1994 | EP0605666A1 Mechanical-vibration-cancelling piezo ceramic microphone |
07/12/1994 | US5329498 Signal conditioning and interconnection for an acoustic transducer |
07/06/1994 | EP0605281A1 Method of vectorial noise reduction in speech and device for performing said method |
07/05/1994 | US5327505 Multiple output transformers network for sound reproducing system |
07/05/1994 | US5327504 Device to improve the bass reproduction in loudspeaker systems using closed housings |
06/23/1994 | WO1994014110A1 Battery drain reducer |
06/23/1994 | CA2150226A1 Battery drain reducer |
06/22/1994 | CN2169966Y Tone regulator for hearing aid |
06/22/1994 | CN2169965Y Contactless automobile electric horn |
06/21/1994 | US5323467 Method and apparatus for sound enhancement with envelopes of multiband-passed signals feeding comb filters |
06/21/1994 | US5323257 Microphone and microphone system |
06/14/1994 | US5321756 Loudspeaker system with sonically powered drivers and centered feedback loudspeaker connected thereto |
06/14/1994 | CA1330201C Frequency dividing network for a multi-way speaker system |
06/09/1994 | DE4241146A1 Electronic signalling device for monitoring e.g. fuses - has capacitance of piezoceramic sound emitter used as capacitance of RC generator |
06/08/1994 | CN2168373Y Sound-effect amplifier special for sound and dance hall |
06/08/1994 | CN1087769A Multiple driver electroacoustical transducing |
06/01/1994 | EP0599450A2 Sound amplifying apparatus with automatic howl-suppressing function |
05/24/1994 | CA2008624C Tri-select hearing assist |
05/18/1994 | EP0597687A1 Method and apparatus for generating sound in a digital computer |
05/17/1994 | US5313524 Self-contained active sound reproducer with switchable control unit master/slave |
05/17/1994 | US5313523 Sound volume controlling apparatus |
05/11/1994 | WO1994010819A1 Hearing aid with permanently adjusted frequency response |
05/11/1994 | EP0596663A2 A high efficiency encoding device and a noise spectrum modifying device and method |
05/04/1994 | EP0595457A1 Noise cancellation apparatus |
05/03/1994 | US5309518 Multiple driver electroacoustical transducing |
05/03/1994 | US5307815 Ultrasonic transducer with integrated variable gain amplifier |
04/30/1994 | CA2109440A1 Noise cancellation apparatus |
04/28/1994 | WO1994009604A1 Hearing aid compensating for acoustic feedback |
04/28/1994 | DE4235845A1 Sound system with subtracting digital filter in signal path - varies transfer function to improve system stability against feedback and increases acoustic output power |
04/26/1994 | US5307417 Sound system with howling-prevention function |
04/20/1994 | EP0593191A1 Multiple driver electroacoustical transducing |
04/19/1994 | US5305388 Bass compensation circuit for use in sound reproduction device |
04/19/1994 | US5305307 Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths |
04/12/1994 | US5303307 Adjustable filter for differential microphones |
04/06/1994 | EP0590903A1 Output limiter for class-D BICMOS hearing aid output amplifier |
04/02/1994 | CA2343560A1 Sound processing apparatus |
03/29/1994 | CA2032848C Automatic calibrating apparatus and method for second-order gradient microphone |
03/22/1994 | US5297212 Loudspeaker system installed on an automobile door and including a woofer and a tweeter |
03/22/1994 | US5297211 Acoustic device for custom installation |
03/22/1994 | US5297210 Microphone actuation control system |
03/22/1994 | US5297034 Telepathology diagnostic network |
03/22/1994 | CA1328004C Aircraft cabin noise control apparatus |
03/17/1994 | WO1994006246A1 Moving picture encoder |
03/15/1994 | US5295192 Electronic noise attenuation method and apparatus for use in effecting such method |
03/02/1994 | EP0584649A1 Circuit for electro-acoustic devices |
03/02/1994 | EP0584346A1 Loudspeaker arrangement with frequency dependent amplitude regulation |