| Patents for H04R 3 - Circuits for transducers (18,190) |
|---|
| 12/18/1990 | CA1278086C Sound location arrangement |
| 12/13/1990 | DE3918654A1 Loudspeaker with filter circuit between separately driven coils - has two moving coils rigidly coupled together in air gap of driver transducer connected to amplifier |
| 12/12/1990 | EP0401244A1 Radio receiver for vehicles |
| 12/04/1990 | US4975953 Combined deemphasis circuit and noise blanker |
| 11/28/1990 | EP0399307A2 Autoradio |
| 11/22/1990 | EP0398595A2 Image derived directional microphones |
| 11/22/1990 | EP0398536A2 Apparatus for controlling acoustical transfer characteristics |
| 11/20/1990 | US4972489 For a motor vehicle characterized by a room width |
| 11/15/1990 | DE3928122A1 Frequency splitter for multi-path loudspeaker system - has analogue sound signals delayed according to transmission delay |
| 11/15/1990 | DE3915205A1 Loudspeaker housing - has individual auxiliary loudspeakers supported within auxiliary housing units attached to sides of main loudspeaker unit |
| 11/15/1990 | DE3915204A1 Loudspeaker housing - has auxiliary individual loudspeakers pivoted about axis adjacent edge of front panel |
| 11/13/1990 | CA1276283C Unidirectional second order gradient microphone |
| 11/08/1990 | DE4007982A1 Audio reproduction system for several audio signal sources - has tuner, signal, converter, clock pulses generator and digital signal processor |
| 11/06/1990 | US4969195 Impedance compensation circuit in a speaker driving system |
| 11/01/1990 | WO1990013215A1 Improved adaptive beam-forming for noise reduction |
| 11/01/1990 | WO1990012627A1 Memory cartridge for video game machine |
| 10/23/1990 | US4965833 Voice enhancer system |
| 10/23/1990 | US4965775 Image derived directional microphones |
| 10/18/1990 | WO1990012476A1 Process and device for distribution of sound among several sound sources |
| 10/04/1990 | WO1990011669A1 Speaker power matching method and apparatus |
| 10/04/1990 | DE4007226A1 Adaptive rauschunterdrueckungsanordnung Adaptive rauschunterdrueckungsanordnung |
| 10/03/1990 | EP0390758A2 A microphone amplifier for contact microphones |
| 10/02/1990 | US4961226 Stereo electroacoustical transducing |
| 10/02/1990 | US4961177 Method and apparatus for inputting a voice through a microphone |
| 09/26/1990 | CN2062930U Dl series contactless electronic horn |
| 09/20/1990 | DE3908402A1 Subwoofer loudspeaker |
| 09/18/1990 | US4958327 Ultrasonic imaging apparatus |
| 09/12/1990 | EP0386765A2 Method of detecting acoustic signal |
| 09/11/1990 | US4956867 Adaptive beamforming for noise reduction |
| 09/05/1990 | EP0385258A2 Circuitry cancelling potential differences and for signal linearisation |
| 09/04/1990 | US4955059 Transmitting system |
| 09/04/1990 | US4953655 Acoustic apparatus |
| 08/30/1990 | DE4003708A1 Ground line impedance elimination circuit - has cable of lower specific resistance than signal lines |
| 08/28/1990 | US4953212 Auto voice changing apparatus |
| 08/23/1990 | WO1990009727A1 Process and device for tonal processing |
| 08/16/1990 | DE3904425A1 Verfahren und vorrichtung zur klangaufbereitung Method and device for sound treatment |
| 08/14/1990 | US4949384 Driving apparatus |
| 08/09/1990 | DE3903246A1 Detection and reduction of defects in sound irradiation in headphones |
| 08/08/1990 | EP0381498A2 Array microphone |
| 08/07/1990 | US4947434 Electronic attenuator |
| 08/07/1990 | US4947356 Aircraft cabin noise control apparatus |
| 08/07/1990 | US4945767 Method and system for controlling ultrasonic probe operation |
| 08/02/1990 | DE3902338A1 Cross-over network |
| 08/01/1990 | EP0380310A2 An acoustic analysis device and a frequency conversion device used therefor |
| 07/26/1990 | DE3901745A1 Circuit for a loudspeaker having a number of voice coils |
| 07/24/1990 | US4944020 Temperature compensation circuit for negative impedance driving apparatus |
| 07/24/1990 | US4943956 Driving apparatus |
| 07/18/1990 | EP0378386A2 Electronic gaming device with pseudo-stereophonic sound generating capabilities |
| 07/18/1990 | EP0377965A2 Combined deemphasis circuit and noise blanker |
| 07/12/1990 | WO1990007824A1 Electronic audio signal amplifier and loudspeaker system |
| 07/12/1990 | DE3840551A1 Method and arrangement for improving the reproduction of sound events by loudspeakers |
| 07/11/1990 | EP0377144A2 Method and device for correcting a distortion of the loudness perception of a reproduced-sound presentation |
| 07/03/1990 | US4939781 Device for eliminating absolute polarity inversion in a high-fidelity sound reproduction system |
| 06/27/1990 | CN2058795U Antinoise micorphone |
| 06/27/1990 | CA2006456A1 Control device for movable article and drive circuit therefor |
| 06/26/1990 | US4937874 Emulated guitar loudspeaker |
| 06/19/1990 | US4934770 Electronic compression system |
| 06/12/1990 | US4933921 Signal reproducing apparatus |
| 06/07/1990 | DE3840707A1 Control circuit for a broadcast receiver |
| 05/16/1990 | EP0368418A1 Device for focussing an ultrasonic beam in three dimensions |
| 05/15/1990 | US4926139 Electronic frequency filter |
| 05/02/1990 | EP0366109A2 Method and device for linearizing the frequency response of a loudspeaker system |
| 05/01/1990 | US4922542 Headphone comfort |
| 05/01/1990 | US4922535 Transient control aspects of circuit arrangements for altering the dynamic range of audio signals |
| 05/01/1990 | US4922131 Differential voltage threshold detector |
| 05/01/1990 | CA1268537A1 Second order toroidal microphone |
| 04/25/1990 | EP0364930A2 Negative impedance driving apparatus having temperature compensation circuit |
| 04/18/1990 | CN2056300U Earphone socket connector for telecommunication shunt circuit |
| 04/10/1990 | CA1267720A1 Method and device for electrically powering a transducer used to generate sound and ultrasound vibrations |
| 04/04/1990 | EP0361445A2 Acoustic apparatus |
| 04/04/1990 | EP0361444A2 Driving apparatus |
| 04/03/1990 | US4914707 Balanced vehicular speaker system |
| 03/27/1990 | US4912393 Voltage regulator with variable reference outputs for a hearing aid |
| 03/15/1990 | DE3929481A1 Noise reduction equipment in speech signal processing system - couples microphones by hierarchical neuronal networks to digital processor |
| 03/14/1990 | CN1007198B Telephone set equipped for amplified listening and with an anti-larsen device |
| 03/13/1990 | US4908870 Motional load driver |
| 02/28/1990 | EP0356327A1 Apparatus for picking up sound signals with noise cancellation |
| 02/27/1990 | US4905290 Howling protective apparatus |
| 02/27/1990 | US4905284 Audio system for vehicular applications |
| 02/13/1990 | US4901354 Method for improving the reliability of voice controls of function elements and device for carrying out this method |
| 02/06/1990 | US4899388 Infrared stereo speaker system |
| 01/30/1990 | US4897879 Multi-way loudspeaker system |
| 01/30/1990 | CA1265063A1 Methods and means for deafening externally generated noises reaching the eardrum and for improving the clarity of perceived electro-acoustic communications |
| 01/17/1990 | EP0350652A1 Electrodynamic loudspeaker |
| 01/10/1990 | CN2051030U Audio equipment with double voice-coil loud-speaker and self phase-reverse function |
| 01/03/1990 | EP0348396A1 Radio receiver speech amplifier circuit. |
| 12/19/1989 | US4888811 Loudspeaker device |
| 12/19/1989 | US4888809 Method of and arrangement for adjusting the transfer characteristic to two listening position in a space |
| 12/19/1989 | US4888807 Variable pattern microphone system |
| 12/12/1989 | US4887298 Electronic circuit for sensing disconnect or failure of a power output sense line in an audio power system |
| 12/06/1989 | EP0344545A2 Temperature compensation circuit in a negative impedance driving amplifier |
| 12/05/1989 | US4885782 Single and double symmetric loudspeaker driver configurations |
| 12/05/1989 | CA1263608A2 Microphone actuation control system suitable for teleconference systems |
| 11/29/1989 | EP0343691A2 An apparatus for changing a sound field |
| 11/29/1989 | EP0343675A2 A microphone apparatus for a video camera |
| 11/29/1989 | EP0343529A2 Driving circuit with control information memory |
| 11/23/1989 | EP0342782A2 Electroacoustic system with electronic filters |
| 11/21/1989 | US4882773 Audio microphone system with digital output and volume control feedback input |
| 11/21/1989 | US4882525 Method for controlling the working frequency of an electro-acoustic vibrating device |
| 11/15/1989 | EP0191836B1 Movable apparatus for sound wiring and/or visualization |