| Patents for H04R 3 - Circuits for transducers (18,190) |
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| 01/26/1989 | WO1989000800A1 Silencer for playback sound field |
| 01/26/1989 | WO1989000746A1 Improvements relating to noise reduction systems |
| 01/18/1989 | EP0155294B1 Method of and apparatus for realising spatial sound effects |
| 01/12/1989 | DE3821939A1 Sound-deadening (sound-absorbing) device |
| 01/11/1989 | CN2030785U Telephone receive and pick-up device with background voice adjustable arrangement |
| 01/10/1989 | US4797933 Bass amplifier with high frequency response |
| 12/28/1988 | CN87217104U Electric trumpet for vehicle |
| 12/22/1988 | DE3718337A1 Drive circuit for a bass loudspeaker |
| 12/20/1988 | US4792974 Automated stereo synthesizer for audiovisual programs |
| 12/07/1988 | EP0293806A2 Dynamic Loudspeaker driving apparatus |
| 12/06/1988 | US4790018 Frequency selection circuit for hearing aids |
| 11/16/1988 | EP0186671A4 Adaptive speech detector system. |
| 11/09/1988 | EP0290415A1 Sound surge detector for alerting headphone users |
| 11/09/1988 | EP0156826B1 Telephone transmission installation |
| 11/08/1988 | US4783819 Automatically controlled amplifier arrangement |
| 11/08/1988 | US4783817 Electronic noise attenuation system |
| 11/03/1988 | DE3713125A1 Loudspeaker system |
| 11/02/1988 | EP0289382A1 Generator for elastic pulses with a predetermined desired shape, and its use in medical treatment or diagnosis |
| 10/11/1988 | US4777649 Acoustic feedback control of microphone positioning and speaking volume |
| 10/04/1988 | US4776018 Removable sound or/and display apparatus |
| 10/04/1988 | US4775766 Tapped transformer/switch assembly |
| 09/29/1988 | DE3742929C1 Verfahren zur Verbesserung der Zuverlaessigkeit von Sprachsteuerungen von Funktionselementen und Vorrichtung zu dessen Durchfuehrung A method for improving the reliability of voice control of functional elements and device for its implementation |
| 09/13/1988 | US4771466 Multidriver loudspeaker apparatus with improved crossover filter circuits |
| 09/13/1988 | CA1242003A1 Inverse control system |
| 09/07/1988 | EP0281123A2 Loudspeaker bon with multiple cross-over networks |
| 09/06/1988 | US4769848 Loudspeaker |
| 09/06/1988 | US4769843 Stereo signal reproducing system |
| 08/24/1988 | CN88201308U Multi tone contactless electronic loudspeaker |
| 08/16/1988 | US4764957 Earpiece, telephone handset and headphone intended to correct individual hearing deficiencies |
| 08/10/1988 | EP0277798A2 Speaker Driver |
| 08/09/1988 | US4763360 Passenger entertainment system having direct coupled seat receivers |
| 07/27/1988 | CN87216711U Radio earphone |
| 07/19/1988 | US4759065 Automotive sound system |
| 07/14/1988 | WO1988005226A1 Radio receiver speech amplifier circuit |
| 07/07/1988 | DE3644288A1 Overload protection circuit |
| 06/22/1988 | EP0272244A2 Method and device for determining vibration characteristics and for driving a piezoelectric transducer |
| 06/22/1988 | EP0272084A2 Ultrasonic horn driving apparatus and method with active frequency tracking |
| 06/21/1988 | US4752961 Microphone arrangement |
| 06/14/1988 | US4751739 Apparatus and method for controlling tone quality |
| 06/14/1988 | US4751418 Electroacoustic transducer |
| 06/09/1988 | DE3740358A1 Loudspeaker volume control circuit |
| 06/08/1988 | EP0270394A1 Method of dividing the acoustical reproduction of modulated signals in transducers mounted in parallel, and set of transducers therefor |
| 06/07/1988 | US4750208 Audio-band electromechanical vibration converter |
| 06/02/1988 | WO1988004124A1 Device for processing an electric audiofrequency signal |
| 05/31/1988 | US4748501 Cable converter for television signals with stereo audio signal |
| 05/31/1988 | US4748365 Method and apparatus for supplying electric power to a vibration generator transducer |
| 05/26/1988 | DE3639499A1 Device for microphones for reducing the acoustic feedback and suppressing interfering environmental noises |
| 05/24/1988 | US4747132 Howling canceller |
| 05/19/1988 | DE3637666A1 Phase- and amplitude-controlled loudspeaker with an arbitrary number of paths |
| 05/18/1988 | CN86107860A Double-winding voice-coil speaker and its power amplifier circuit |
| 05/10/1988 | CA1236607A1 Microphone arrangement |
| 05/10/1988 | CA1236406A1 Fader arrangement in electrical reproducing apparatus and fader control for such an arrangement |
| 05/03/1988 | US4742548 Unidirectional second order gradient microphone |
| 04/26/1988 | US4741040 Bass-reflex loudspeaker system |
| 04/26/1988 | US4741038 Signal processing arrangement |
| 04/19/1988 | US4739514 Automatic dynamic equalizing |
| 04/12/1988 | US4736631 Ultrasonic probes |
| 04/06/1988 | EP0262172A1 Sound reproduction systems |
| 03/30/1988 | EP0261954A2 Digital signal gain control circuitry |
| 03/29/1988 | US4734659 Ultrasonic oscillator |
| 03/23/1988 | EP0260726A2 Passenger entertainment system having direct coupled seat receivers |
| 03/22/1988 | US4733193 Arrangement for eliminating signal hum |
| 02/23/1988 | US4727584 Loudspeaker with motional feedback |
| 02/18/1988 | DE3627002A1 Method and circuit arrangement for acoustically compensating for the environmental noise in headphone reception |
| 02/09/1988 | US4724406 Device for attenuating noise in electrical apparatus |
| 02/02/1988 | US4723294 Noise canceling system |
| 02/02/1988 | US4723277 Loudspeaking telephone set having an anti-Larsen device for instability detection and control |
| 02/02/1988 | US4722517 Mechanical spring having negative spring stiffness useful in an electroacoustic transducer |
| 02/01/1988 | EP0162855A4 Effects box system and method. |
| 01/28/1988 | WO1988000761A1 Device for attenuating noise in electrical apparatus |
| 01/28/1988 | DE3624764A1 Method and device for the frequency shifting of AF signals |
| 01/26/1988 | US4721923 Radio receiver speech amplifier circuit |
| 01/26/1988 | US4721902 Noise rejection in a sonic transducer |
| 01/19/1988 | US4720665 Signal transducer |
| 01/14/1988 | WO1988000410A1 Emulated guitar loudspeaker |
| 01/13/1988 | EP0252647A1 Aircraft cabin noise control apparatus |
| 01/07/1988 | EP0251865A1 Method and apparatus for improving the sensitivity and signal to noise ratio of piezoelectric transducers comprising several sensors connected in parallel |
| 01/07/1988 | DE3630478C1 Motion sensor for dynamic loudspeakers |
| 01/05/1988 | USH417 Headset for ambient noise suppression |
| 12/30/1987 | WO1987007974A1 Aircraft cabin noise control apparatus |
| 12/29/1987 | CA1230828A1 Digital graphic equalizer |
| 12/23/1987 | EP0249965A1 Ultrasonic apparatus |
| 12/23/1987 | EP0249640A1 Multi-channel stereo reproducing apparatus |
| 12/22/1987 | CA1230666A1 Acoustic direction identification system |
| 12/10/1987 | DE3633156A1 Circuit arrangement for improving the sound of loudspeakers |
| 12/08/1987 | US4712247 Electro-acoustic system having a variable reflection/absorption characteristic |
| 12/08/1987 | US4712244 Directional microphone arrangement |
| 12/02/1987 | EP0247554A2 Special balancing wire to eliminate potential differences and to make signals linear |
| 11/25/1987 | EP0246528A2 regulated ultrasonic generator |
| 11/24/1987 | US4709391 Arrangement for converting an electric signal into an acoustic signal or vice versa and a non-linear network for use in the arrangement |
| 11/17/1987 | US4707813 Ultrasound apparatus permitting dynamic variation of the position of the reception focus |
| 11/17/1987 | CA1229309A1 Filter system |
| 11/10/1987 | US4705980 Drive control method of ultrasonic vibrator |
| 10/27/1987 | US4703506 Directional microphone apparatus |
| 10/21/1987 | EP0241994A1 Multi-way loudspeaker system |
| 10/21/1987 | CN86102641A Muffling feedback circuit of electroacoustic equipment |
| 10/15/1987 | DE3707620A1 Acceleration sensor for dynamic loudspeakers |
| 10/15/1987 | DE3617798A1 Special compensation line for eliminating potential differences and for linearising signals |
| 10/08/1987 | DE3627320C1 Loudspeaker controlled with respect to the radiated sound pressure |
| 10/07/1987 | EP0240360A2 Ultrasonic oscillator |