Patents for H04R 3 - Circuits for transducers (18,190)
04/1996
04/09/1996US5506908 Directional microphone system
04/09/1996US5506532 Output limiter for class-D BICMOS hearing aid output amplifier
04/04/1996DE4434633A1 Woofer loudspeaker box for home use
04/03/1996EP0705054A2 Sound reproduction system
04/03/1996EP0704118A1 Signal amplifier system with improved echo cancellation
04/03/1996EP0486679B1 Method and apparatus for adaptive audio resonant frequency filtering
03/1996
03/27/1996CN1031444C Apparatus for adjusting of character of radio wave
03/21/1996DE19531778A1 Audio system with cable connection device e.g. for cassette device or CD player
03/19/1996US5500903 Method for vectorial noise-reduction in speech, and implementation device
03/14/1996WO1996008004A1 Directional ear device with adaptive bandwidth and gain control
03/13/1996EP0701386A2 Speaker and drive device therefor
03/13/1996EP0700622A1 An integrated video and audio signal distribution system for use on commercial aircraft and other vehicles
03/07/1996WO1996007293A1 Device for controlling the volume of a car radio dependently upon the ambient noise
03/07/1996WO1996007292A1 Method and apparatus for a sequential interface between an audio signal and an electro-acoustic transducer
03/07/1996DE4430931A1 Einrichtung zur fahrgeräuschabhängigen Steuerung der Lautstärke eines Autoradios Means for driving noise dependent volume control of a car radio
03/06/1996EP0700156A2 Beamformer using coefficient restrained adaptive filters for detecting interference signals
03/06/1996EP0700155A1 Method and apparatus capable of quickly identifying an unknown system with a final error reduced
02/1996
02/28/1996EP0698333A1 Voice coil excursion and amplitude gain control device
02/20/1996US5493620 High fidelity sound reproducing system
02/13/1996US5491452 Peltier element as series noise clamp
02/06/1996US5490219 Noise canceling microphone with visual feedback
02/01/1996DE4447269C1 Frequency filter for multi-path loudspeaker systems with enhanced phase characteristic
01/1996
01/31/1996EP0694833A1 Intelligent human interface system
01/31/1996EP0694246A1 A method and a coupling for reducing the harmonic distortion of a capacitive transducer
01/31/1996CN1116036A Gradient directional microphone system and method thereof
01/30/1996US5488258 Circuit for muting noises in a power amplifier
01/30/1996CA2077894C Improved audio distribution system
01/29/1996CA2151073A1 Intelligent human interface system
01/17/1996EP0692923A1 Selective sound pick-up device for reflecting and noisy environment
01/17/1996CN2217862Y Speech-sounds recording-playing voice-box directly connected with interface of microcomputor
01/09/1996US5483599 Directional microphone system
01/09/1996US5483367 Transmitting and receiving apparatus for a radio headphone
01/03/1996EP0690657A2 A directional microphone system
01/03/1996EP0690656A2 Long-time balancing of omni microphones
01/03/1996EP0690655A2 Direction finder
01/02/1996US5481617 Loudspeaker arrangement with frequency dependent amplitude regulation
01/02/1996US5479813 Sensor matching through real-time output compensation
12/1995
12/31/1995CA2149680A1 Direction finder
12/27/1995EP0689372A1 Loudspeaker with integrated capacitor
12/27/1995EP0689191A2 Mobile transceiver
12/27/1995CN1114097A Circuit capable of quickly controlling tone and dynamic acoustics
12/26/1995US5479517 Method of estimating delay in noise-affected voice channels
12/21/1995WO1995034983A1 Adaptive microphone arrangement and method for adapting to an incoming target-noise signal
12/20/1995CN1113644A Frequency Q-value balancing method for electric audio system
12/20/1995CN1113627A Noise-canceling differential microphone assembly
12/19/1995US5477270 Distance-adaptive microphone for video camera
12/12/1995US5475759 Electronic filters, hearing aids and methods
12/07/1995WO1995033357A1 Process and equipment for the reproduction of sound signals, and associated control device and sound reproduction device
12/07/1995DE19505435C1 Tonality evaluation system for audio signal
12/06/1995EP0685133A1 Voice transmission systems with voice cancellation
12/05/1995US5473702 Adaptive noise canceller
12/05/1995US5473701 Adaptive microphone array
12/05/1995US5473684 Noise-canceling differential microphone assembly
11/1995
11/30/1995WO1995028034A3 Signal amplifier system with improved echo cancellation
11/30/1995DE4418360A1 Multiple direction loudspeaker
11/30/1995DE4418337A1 Verfahren und Vorrichtung zur Wiedergabe von Schallsignalen sowie Steuergerät und Schallwiedergabegerät A method and apparatus for reproducing sound signals as well as the control unit and the sound reproduction device
11/28/1995US5471538 Microphone apparatus
11/23/1995WO1995031805A1 Multimedia personal computer with active noise reduction and piezo speakers
11/23/1995WO1995028816A3 Infrared audio transmitter system
11/22/1995EP0683621A2 Transmitter-receiver having ear-piece type acoustic transducing part
11/22/1995EP0682801A1 A noise reduction system and device, and a mobile radio station
11/22/1995EP0464222B1 Sound reproducing device
11/22/1995CN1112329A Microphone of video camera
11/21/1995US5469511 Method and apparatus for presentation of on-line directional sound
11/15/1995EP0682436A2 Voice actuated switching system
11/15/1995EP0681717A1 Battery drain reducer
11/15/1995CN2212871Y Contactless electric horn
11/14/1995US5467400 Solid state audio amplifier emulating a tube audio amplifier
11/14/1995US5467393 Method and apparatus for volume and intelligibility control for a loudspeaker
11/09/1995WO1995030221A1 Industrial headset
11/08/1995EP0681366A1 Sequential amplifier
11/07/1995US5463893 Sensor matching through real-time output compensation
11/07/1995CA2056292C Sound volume controlling apparatus
11/02/1995WO1995029479A1 Methods and apparatus for adaptive beamforming
10/1995
10/31/1995US5463694 Gradient directional microphone system and method therefor
10/26/1995WO1995028816A2 Infrared audio transmitter system
10/26/1995CA2185905A1 Infrared audio transmitter system
10/25/1995EP0679044A2 Noise-canceling differential microphone assembly
10/24/1995US5461676 Device for improving bass reproduction in loudspeaker system with closed housings
10/19/1995WO1995028034A2 Signal amplifier system with improved echo cancellation
10/18/1995EP0677978A2 Appliance for signal transmission from an amplifier to a loudspeaker
10/18/1995EP0677931A2 Moise shaping of differntially encoded and compressed audiosignals
10/17/1995US5459792 Audio input circuit for voice recognition
09/1995
09/28/1995DE4410671A1 Correction of frequency response e.g. of loudspeakers
09/27/1995CN1109254A Playback system with dynamic error feedforward
09/21/1995WO1995025413A1 Self-damping speaker matching device and method
09/18/1995CA2144782A1 Microphone with infrared on/off switch
09/14/1995DE19508368A1 Audio output equaliser and amplifier for personal computer
09/13/1995EP0671114A1 Hearing aid compensating for acoustic feedback
09/12/1995US5450494 Automatic volume controlling apparatus
09/05/1995US5448637 Two-way communications earset
08/1995
08/30/1995EP0627139A4 Feedback level estimator between loudspeaker and microphone.
08/23/1995EP0668007A1 Mobile radiotelephone set with handsfree device
08/22/1995US5444785 Echo attaching circuit and audio device using the same
08/22/1995US5444783 Automatic sound volume control device for acoustic instruments
08/15/1995US5442712 Sound amplifying apparatus with automatic howl-suppressing function
08/10/1995DE4403792A1 Pre-amplifier with inputs to music source and microphone
08/08/1995US5440644 Audio distribution system having programmable zoning features
08/08/1995US5440642 Analog noise cancellation system using digital optimizing of variable parameters
08/02/1995CN1106178A Electrical circuits having noise eliminating element