| Patents for H04R 3 - Circuits for transducers (18,190) |
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| 08/25/1992 | US5142586 Electro-acoustical system |
| 08/20/1992 | DE4104481A1 Single system for simultaneously emitting sound and light effects - with light effects system connected in direct neighbourhood with conventional loud speakers but can also be controlled independently |
| 08/19/1992 | CN2113581U Combined machine with radio and recorder function |
| 08/13/1992 | DE4104058A1 Control for distribution of electric audio signals to connected loudspeakers - comprises electrical circuit with specific output sides for each loudspeaker connected via integral impedance correction |
| 08/13/1992 | DE4103613A1 Stereo condenser microphone involving three microphone systems in common housing - are connected via common changeover switch to amplifiers for left and right-hand channels, changeover switch comprising three individual switches |
| 08/12/1992 | CN2112914U Reverberation microphone |
| 08/11/1992 | US5138663 Method and apparatus for performing noise cancelling and headphoning |
| 08/11/1992 | US5138187 Amplitude variable pulse generating circuit |
| 08/06/1992 | WO1992013388A1 Solid state audio amplifier emulating a tube audio amplifier |
| 08/06/1992 | DE4102638A1 Sound emitter on sub-woofer-satellite principle - has mono-bass boxes for left- and right-hand channels of sub-woofer |
| 07/28/1992 | US5134659 Method and apparatus for performing noise cancelling and headphoning |
| 07/23/1992 | WO1992012604A1 Electoacoustic transducer system for sound recording or reproduction |
| 07/23/1992 | DE4101933A1 Control appts. for directional microphone signals - produces virtual directional characteristics with adjustable main receiving direction and degree of bunching |
| 07/22/1992 | CN2110967U Contactless electronic loudspeaker |
| 07/21/1992 | CA1305527C Speaker driver |
| 07/16/1992 | DE4100849A1 Loudspeaker operation with diaphragm deflection-dependent control algorithm - prevents deflection beyond limit as algorithm is varied in response to approach to predetermined boundary value |
| 07/16/1992 | DE4100848A1 Regulating process for open box loudspeaker - uses analogue computer circuit with regulator inputs to control system |
| 07/16/1992 | DE4100847A1 Electromechanical converter and regulator - has model built into control loop with optimisation for regulating loudspeaker |
| 07/15/1992 | CN2110328U Non-contact electric loudspeaker for automobile and ship |
| 07/14/1992 | US5131048 Audio distribution system |
| 07/14/1992 | US5131047 Noise suppressor |
| 07/10/1992 | WO1992012606A1 Improved audio distribution system |
| 07/08/1992 | EP0493986A2 Digital transmitting and receiving apparatus for cordless headphones |
| 07/07/1992 | US5129006 Electronic audio signal amplifier and loudspeaker system |
| 07/07/1992 | US5129005 Electrodynamic loudspeaker |
| 07/07/1992 | US5129003 Active noise control apparatus for domestic appliance |
| 07/05/1992 | WO1992012583A1 Adaptive acoustic echo canceller |
| 07/02/1992 | DE4139681A1 Bass loudspeaker drive unit - uses diaphragm suspension of negligible stiffness and PID controller to compensate for diaphragm deflection |
| 06/25/1992 | WO1992010876A1 Compensating filters |
| 06/17/1992 | CN2107747U Multi-phone microphone |
| 06/10/1992 | CN2107100U Non-contact electronic horn for vehicles |
| 06/09/1992 | US5121426 Loudspeaking telephone station including directional microphone |
| 06/09/1992 | CA1302901C Removable audio-visual apparatus |
| 06/03/1992 | CN2106465U Loudspeaker with contactless multifunctional integrated circuit for car |
| 06/02/1992 | US5118309 Minimum wire interface for multiple accessories |
| 05/26/1992 | US5117461 Electroacoustic device for hearing needs including noise cancellation |
| 05/26/1992 | US5117459 Ambient imaging loudspeaker system |
| 05/19/1992 | CA1301073C Voice enhancer system |
| 05/13/1992 | EP0485010A1 A filtering device for high frequency loudspeakers |
| 05/07/1992 | DE4035448A1 Stereo loudspeaker or headphone connection circuit - responds to signal from independent source, e.g. telephone or doorbell |
| 05/06/1992 | CN1016550B Double-winding voice-coil speaker and its power amplifier circuit |
| 05/05/1992 | US5111508 Audio system for vehicular application |
| 05/05/1992 | US5111507 System for reducing noise level in vehicular cabin |
| 05/05/1992 | US5111419 Electronic filters, signal conversion apparatus, hearing aids and methods |
| 04/28/1992 | US5109422 Acoustic apparatus |
| 04/28/1992 | US5109420 Car audio device |
| 04/28/1992 | US5109419 Electroacoustic system |
| 04/28/1992 | US5109410 Two-line, hands-free telephone system |
| 04/28/1992 | CA1299726C Ultrasonic horn driving apparatus and method with active frequency tracking |
| 04/28/1992 | CA1299725C Noise reduction systems |
| 04/15/1992 | EP0480509A1 Arrangement for supplying energy to a load, as well as a drive system and a sound reproduction system comprising such an arrangement |
| 04/08/1992 | EP0479604A2 Method and apparatus for presentation of on-line directional sound |
| 04/08/1992 | EP0479603A2 Method and apparatus for monitoring physical positioning of a user |
| 04/08/1992 | EP0479410A1 Sound field compensating apparatus for a small room |
| 04/08/1992 | CN1060185A Noise eliminating element and electrical circuit having same |
| 04/07/1992 | US5103190 Driving apparatus, and control information storage body and protection circuit therefor |
| 04/02/1992 | WO1992005538A1 Noise cancelling systems |
| 04/02/1992 | DE4030937A1 High power automobile Hi=Fi system - has auxiliary loudspeakers contained in housing mounted within vehicle boot |
| 04/02/1992 | DE4028057A1 Camcorder TV camera with microphone - has housing with noise receiver, whose output voltage is subtracted from microphone output signal |
| 04/01/1992 | EP0477591A1 Amplifier unit |
| 03/25/1992 | EP0476620A2 Noise reducing element and electrical circuit having the same |
| 03/25/1992 | EP0476082A1 Device for improving bass reproduction in loudspeaker systems with closed housings. |
| 03/19/1992 | DE4111820A1 Acoustic feedback elimination circuitry for loudspeaking telephone - uses frequency detectors controlling level of attenuation device |
| 03/18/1992 | EP0475297A2 Remote control apparatus for audio reproduction apparatus |
| 03/17/1992 | US5097514 Approximating the movement of a vibrating surface |
| 03/17/1992 | US5097513 Speaker system enclosure integrated with amplifier circuit board |
| 03/17/1992 | US5095798 Electronic gaming device with pseudo-stereophonic sound generating capabilities |
| 03/11/1992 | EP0474548A1 Method and apparatus for improving the reproduction quality of stereophonic ambience sound |
| 03/11/1992 | CN2098775U Circuit for avoiding microphone from producing noise |
| 03/10/1992 | US5095506 Sound reproduction system utilizing sound extinction device |
| 03/05/1992 | CA2050622A1 Method and device for improving the reproduction quality of stereo ambience sound |
| 03/03/1992 | CA1296650C Active acoustic attenuation system with differential filtering |
| 03/03/1992 | CA1296649C Active acoustic attenuation system for higher order mode non-uniform sound field in a duct |
| 02/26/1992 | EP0472356A1 Speech recognition apparatus for a vehicle, using a microphone arrangement to determine the seat from which a command is generated |
| 02/26/1992 | EP0471990A2 Double-coil loudspeaker |
| 02/19/1992 | EP0471477A1 Wireless receiver |
| 02/04/1992 | US5086473 Feedback system for a sub-woofer loudspeaker |
| 01/29/1992 | EP0468610A2 Method and apparatus for performing noise cancelling in headphones |
| 01/28/1992 | CA2047855A1 Method and apparatus for performing noise cancelling and headphoning |
| 01/22/1992 | EP0467499A2 Audio apparatus with anti-howl function |
| 01/21/1992 | US5083311 Sound field producing apparatus |
| 01/16/1992 | DE4021787A1 Electro-acoustic system e.g. for telephone appts. - controls coupling between loudspeaker and microphone via space to suppress acoustic feedback using filter and/or modulator |
| 01/15/1992 | EP0465563A1 Speaker power matching method and apparatus |
| 01/15/1992 | CN2093489U Degenerative distortion canceller for acoustical eguipment |
| 01/08/1992 | EP0464273A1 Electro-acoustic device |
| 01/08/1992 | EP0464222A1 Sound reproducing device |
| 01/07/1992 | CA1293931C Automotive sound system |
| 12/31/1991 | US5076260 Sensible body vibration |
| 12/18/1991 | EP0461801A2 Noise suppressor circuit for audio equipment |
| 12/14/1991 | WO1991020134A1 Method and apparatus for adaptive audio resonant frequency filtering |
| 12/04/1991 | EP0459506A1 Volume limiting circuit |
| 11/26/1991 | US5068903 Method of and arrangement for linearizing the frequency response of a loudspeaker system |
| 11/04/1991 | CA2022406A1 Ambient imaging loudspeaker system |
| 10/23/1991 | EP0453293A2 Sound field variable apparatus |
| 10/16/1991 | EP0452103A2 Microphone apparatus |
| 10/15/1991 | US5058171 Microphone arrangement |
| 10/15/1991 | US5058170 Array microphone |
| 10/15/1991 | US5058169 Public address system |
| 10/10/1991 | WO1991015933A1 Device for improving bass reproduction in loudspeaker systems with closed housings |
| 10/10/1991 | DE4104074A1 Electronic circuit for connection to inductive devices - uses negative input and output resistance to compensate for DC resistance |