| Patents for H04R 3 - Circuits for transducers (18,190) |
|---|
| 10/07/1987 | EP0239914A2 An electronic loudspeaker system having a harmonious sound with multiple adjustable sound levels |
| 09/30/1987 | EP0238887A1 Hearing aid having a housing to be worn behind the ear |
| 09/29/1987 | CA1227573A1 Adaptive speech detector system |
| 09/24/1987 | WO1987005774A1 Sound reproduction systems |
| 09/22/1987 | US4696043 Microphone apparatus having a variable directivity pattern |
| 09/16/1987 | EP0237454A1 Processes and devices for attenuating noise from an external origin arriving at the ear drum, and for improving the intelligibility of electro-acoustic communications |
| 09/15/1987 | US4694498 Automatic sound field correcting system |
| 09/15/1987 | CA1226820A1 Pressure wave transducing |
| 09/11/1987 | WO1987005430A1 Methods and devices to improve the intelligibility of electroacoustic communications |
| 09/09/1987 | EP0236076A2 Circuits for altering the dynamic range of audio signals |
| 09/09/1987 | EP0235848A1 Automatically controlled amplifier arrangement |
| 09/03/1987 | DE3627960C1 Monitoring device for loudspeaker installations |
| 09/02/1987 | EP0234651A1 Amplifier with automatic gain control |
| 09/01/1987 | US4691361 Speaker changeover device |
| 09/01/1987 | CA1226229A1 Loudspeaker system utilizing an equalizer circuit |
| 08/25/1987 | US4689818 Resonant peak control |
| 08/18/1987 | US4687962 Ultrasonic horn driving apparatus and method with active frequency tracking |
| 07/30/1987 | DE3602643A1 Automatic microphone control for electroacoustical transmission systems |
| 07/28/1987 | US4683590 Inverse control system |
| 07/22/1987 | EP0229230A1 Directional-microphone arrangement |
| 07/21/1987 | US4682364 Fader circuit arrangement in electrical reproducing apparatus and fader control for such an arrangement |
| 07/08/1987 | CN86108777A Method and apparatus for magnetic transducing |
| 07/08/1987 | CN86106808A Telephone set equipped for amplified listening and with an anti-larsen device |
| 07/02/1987 | DE3639896A1 Four-channel method for transmitting three-dimensional sound events |
| 07/01/1987 | EP0226821A1 Ultrasonic apparatus with dynamic change of the focal-reception position |
| 06/30/1987 | CA1223526A2 Electroacoustic network |
| 06/23/1987 | US4675906 Second order toroidal microphone |
| 06/23/1987 | US4675905 Multiple input silent audio switch |
| 06/23/1987 | US4675835 Device for compensating reproduction errors in an electroacoustic transducer |
| 06/09/1987 | US4672674 Communications systems |
| 06/09/1987 | CA1222798A1 Stereo sound and light track system |
| 06/04/1987 | WO1987003449A1 Multi-channel stereo reproducing apparatus |
| 05/13/1987 | EP0221324A1 Signal transducer |
| 05/05/1987 | CA1221312A1 Multidriver loudspeaker system with crossover filters having transfer functions with brick-wall amplitude vs. frequency response characteristics |
| 04/29/1987 | EP0219865A2 System and method for controlling tone quality |
| 04/28/1987 | US4661982 Digital graphic equalizer |
| 04/23/1987 | DE3531760A1 Device for electro-acoustic, stereophonic reproduction with a plurality of loudspeakers |
| 04/16/1987 | DE3536306A1 Electronic current stabilizing amplifier |
| 04/09/1987 | DE3635223A1 Motion control for loudspeakers |
| 04/08/1987 | EP0217694A1 Method and device for electrically powering a transducer generating sonic and ultrasonic vibrations |
| 04/07/1987 | CA1220144A1 Hearing aid with a housing to be worn behind the ear |
| 04/01/1987 | EP0216326A2 Electroacoustic transducer |
| 03/31/1987 | US4654546 Electromechanical film and procedure for manufacturing same |
| 03/31/1987 | CA1219811A1 Loudspeaker system and loudspeaker for use in a loudspeaker system for converting an n-bit digitized electric signal into an acoustic signal |
| 03/24/1987 | US4653103 Loudspeaker structure and system |
| 03/24/1987 | US4653102 Directional microphone system |
| 03/24/1987 | US4653087 Stereo interface telephone ring detector |
| 03/11/1987 | EP0213679A1 Telephone set with a receiving amplifier provided with an anti-Larsen arrangement |
| 03/11/1987 | EP0213319A2 Loudspeaker with motional feedback |
| 03/10/1987 | US4649565 Electro-acoustic converter with compensated frequency response characteristic |
| 03/10/1987 | CA1218937A1 Loudspeaker system with boundary layer control |
| 03/03/1987 | US4648117 Mobile sound field correcting device |
| 03/03/1987 | US4648116 Sound panning apparatus |
| 03/03/1987 | US4648115 Pan-pot control apparatus |
| 02/17/1987 | US4644581 Headphone with sound pressure sensing means |
| 02/17/1987 | US4644505 Broadband matching network |
| 02/05/1987 | DE3618961A1 Motor sensor for loudspeakers |
| 01/28/1987 | EP0209931A2 Equaliser with adjustable band filters and a digital filter suitable for use in the equaliser |
| 01/28/1987 | EP0209894A2 Method for suppressing feedback in electroacoustic installations and arrangement for carrying out this method |
| 01/21/1987 | CN86201730U Electron horn with multistage and harmonic sound |
| 01/20/1987 | US4638506 Sound field simulation system and method for calibrating same |
| 01/20/1987 | US4638258 Reference load amplifier correction system |
| 01/20/1987 | US4638125 Hearing aid with a housing to be worn behind the ear |
| 01/20/1987 | CA1216944A1 Speech recognition system |
| 01/20/1987 | CA1216798A1 Method and device for the transmission of acoustic information as perceivable vibrations |
| 01/14/1987 | EP0208474A2 Automotive sound system |
| 01/14/1987 | EP0208389A2 Headphone apparatus |
| 01/08/1987 | DE3625569A1 Circuit for reducing intermodulation in loudspeakers |
| 12/31/1986 | CN85104223A Wireless connecting method for earphone electro-acoustic conversion |
| 12/23/1986 | US4631749 ROM compensated microphone |
| 12/16/1986 | CA1215326A1 Motion picture theater loudspeaker system |
| 12/09/1986 | US4628530 Automatic equalizing system with DFT and FFT |
| 12/09/1986 | US4628528 Pressure wave transducing |
| 12/03/1986 | EP0203142A1 An arrangement for eliminating signal hum |
| 11/25/1986 | US4625328 Integrated amplifier and speaker system with improved cooling efficiency |
| 11/20/1986 | EP0202016A2 Multiple input silent audio switch |
| 11/11/1986 | US4622691 Mobile sound field correcting device |
| 11/11/1986 | US4622440 Differential hearing aid with programmable frequency response |
| 10/21/1986 | US4618987 Large-area acoustic radiation system |
| 09/24/1986 | EP0195416A2 Inverse control system |
| 09/24/1986 | CN85100784A Feedback acoustic suppressor |
| 09/23/1986 | CA1211718A1 Solid state bilateral switch as an inverter |
| 09/16/1986 | CA1211380A1 Loudspeaker system |
| 09/02/1986 | US4609784 Loudspeaker with motional feedback |
| 08/27/1986 | EP0191836A1 Movable apparatus for sound wiring and/or visualization. |
| 08/26/1986 | US4608506 Temperature compensated drive for a piezoelectric displacement generator |
| 08/26/1986 | CA1210336A2 Electronic stereo reverberation device with doubler |
| 08/19/1986 | US4607382 Electroacoustic transducer unit with reduced resonant frequency and mechanical spring with negative spring stiffness, preferably used in such a transducer unit |
| 08/19/1986 | CA1210095A1 Automatic equalizing system with dft or fft |
| 08/19/1986 | CA1209926A1 Hybrid loudspeaker system, at option with one or more correction circuits |
| 08/12/1986 | US4606071 Loudspeaker system utilizing an equalizer circuit |
| 07/30/1986 | EP0188609A1 Piezoelectric loudspeaker having a feedback transducer |
| 07/29/1986 | CA1208758A1 Microphone array apparatus and method for extracting desired signal |
| 07/09/1986 | EP0186996A2 Unidirectional second order gradient microphone |
| 07/09/1986 | EP0186671A1 Adaptive speech detector system |
| 07/02/1986 | EP0186388A2 Second order toroidal microphone |
| 07/01/1986 | US4598178 Means for critically damping a dynamic loudspeaker |
| 06/24/1986 | US4597100 Ultra high resolution loudspeaker system |
| 06/11/1986 | EP0183911A2 Radio receiver, radio receiver combined with a cassette recorder, or a cassette recorder |
| 06/05/1986 | WO1986003354A1 An arrangement for eliminating signal hum |