Patents for H04R 3 - Circuits for transducers (18,190)
11/1994
11/17/1994DE4413945A1 Loudspeaker
11/17/1994DE4316098A1 Interference microphone
11/16/1994CN2183064Y Microphone for karaoke
11/16/1994CN1026634C 回声添加电路 Echo adding circuit
11/11/1994CA2095911A1 Monitor receiving system and a monitor receiving device
11/10/1994WO1994026075A1 Tracking platform system
11/09/1994EP0624047A1 Asymmetrical transducing
11/09/1994EP0624046A1 Noise-compensated hands-free communication apparatus in motor vehicles
11/09/1994EP0623395A1 Attenuation circuit for ultrasoundtransducers
11/08/1994US5363434 Audio distribution system
11/02/1994EP0622896A1 Sound system gain and equalization circuit
11/01/1994US5361306 Apparatus and methods for enhancing an electronic audio signal
11/01/1994US5361304 Headphone assemblies
11/01/1994US5361013 Device comprising a piezoelectric transducer
10/1994
10/29/1994CA2121299A1 Sound system gain and equalization circuit
10/27/1994WO1994024834A1 Hearing aid having a microphone switching system
10/27/1994DE4303360C1 Method for reducing quality losses
10/26/1994EP0621737A1 Stereo ultradirectional microphone apparatus
10/23/1994CA2094667A1 Two-way communications earset with filter
10/19/1994CN2180024Y Voice grade correcting device for karaoke videocorder
10/18/1994US5357251 Electronic filters, signal conversion apparatus, hearing aids and methods
10/18/1994US5357207 Sequential amplifier
10/13/1994WO1994023547A1 A method and a coupling for reducing the harmonic distortion of a capacitive transducer
10/11/1994US5355419 On-vehicle audio system reproducing bodily-sensible sounds
09/1994
09/29/1994WO1994022275A1 System comprising multiple wireless microphone/transmitter units using a common carrier
09/29/1994DE4410741A1 Connecting device for an audio system in a car
09/28/1994EP0617405A1 Sound field control device
09/22/1994DE4303093A1 Condenser microphone of two transducers having a variable directional pattern
09/21/1994EP0616340A1 A cable for electronic equipment
09/21/1994EP0616313A1 Apparatus for generating a sound based on D/A converted analog signal
09/21/1994CN2178032Y Balance transmission audio frequency dividing apparatus
09/20/1994US5349301 Multiple amplifier system for a car
09/15/1994WO1994021093A1 Process and apparatus for improving the sound reproduction quality of electroacoustic transducers
09/14/1994EP0615387A1 Moving picture encoder
09/13/1994US5347587 Speaker driving device
09/08/1994DE4306667A1 Audio frequency filter
09/07/1994EP0613603A1 A circuit for use with microphones
09/06/1994USH1356 Bomb sensor system
09/01/1994WO1994019894A1 Voice transmission systems with voice cancellation
08/1994
08/31/1994EP0613319A1 Multimicrophone sound pick-up device and associated signal processing device
08/31/1994EP0613318A1 Microphone apparatus
08/31/1994CN1091579A Karaoke system and method of controlling the same
08/24/1994EP0612059A2 Method for estimating the propagation time in noisy speech channels
08/24/1994CA2112278A1 Noise-reduction system
08/18/1994DE4403723A1 Microphone for a video camera
08/16/1994CA2027138C Loudspeaking telephone station including directional microphone
08/09/1994US5337367 Recording device and video device using the same
08/03/1994CN2173485Y Digital audio frequency synthesis device
08/03/1994CN2173446Y 数字混响背景音乐机 Digital reverb background music machine
07/1994
07/26/1994US5332928 Battery drain reducer
07/26/1994CA2021676C Communication system with active noise cancellation
07/21/1994WO1994016536A1 Speaker containing dual coil
07/20/1994EP0606387A1 Process and system for sound pick-up, apparatus for sound pick-up and reproduction.
07/14/1994DE4300379A1 HF condenser microphone circuit
07/13/1994EP0605666A1 Mechanical-vibration-cancelling piezo ceramic microphone
07/12/1994US5329498 Signal conditioning and interconnection for an acoustic transducer
07/06/1994EP0605281A1 Method of vectorial noise reduction in speech and device for performing said method
07/05/1994US5327505 Multiple output transformers network for sound reproducing system
07/05/1994US5327504 Device to improve the bass reproduction in loudspeaker systems using closed housings
06/1994
06/23/1994WO1994014110A1 Battery drain reducer
06/23/1994CA2150226A1 Battery drain reducer
06/22/1994CN2169966Y Tone regulator for hearing aid
06/22/1994CN2169965Y Contactless automobile electric horn
06/21/1994US5323467 Method and apparatus for sound enhancement with envelopes of multiband-passed signals feeding comb filters
06/21/1994US5323257 Microphone and microphone system
06/14/1994US5321756 Loudspeaker system with sonically powered drivers and centered feedback loudspeaker connected thereto
06/14/1994CA1330201C Frequency dividing network for a multi-way speaker system
06/09/1994DE4241146A1 Electronic signalling device for monitoring e.g. fuses - has capacitance of piezoceramic sound emitter used as capacitance of RC generator
06/08/1994CN2168373Y Sound-effect amplifier special for sound and dance hall
06/08/1994CN1087769A Multiple driver electroacoustical transducing
06/01/1994EP0599450A2 Sound amplifying apparatus with automatic howl-suppressing function
05/1994
05/24/1994CA2008624C Tri-select hearing assist
05/18/1994EP0597687A1 Method and apparatus for generating sound in a digital computer
05/17/1994US5313524 Self-contained active sound reproducer with switchable control unit master/slave
05/17/1994US5313523 Sound volume controlling apparatus
05/11/1994WO1994010819A1 Hearing aid with permanently adjusted frequency response
05/11/1994EP0596663A2 A high efficiency encoding device and a noise spectrum modifying device and method
05/04/1994EP0595457A1 Noise cancellation apparatus
05/03/1994US5309518 Multiple driver electroacoustical transducing
05/03/1994US5307815 Ultrasonic transducer with integrated variable gain amplifier
04/1994
04/30/1994CA2109440A1 Noise cancellation apparatus
04/28/1994WO1994009604A1 Hearing aid compensating for acoustic feedback
04/28/1994DE4235845A1 Sound system with subtracting digital filter in signal path - varies transfer function to improve system stability against feedback and increases acoustic output power
04/26/1994US5307417 Sound system with howling-prevention function
04/20/1994EP0593191A1 Multiple driver electroacoustical transducing
04/19/1994US5305388 Bass compensation circuit for use in sound reproduction device
04/19/1994US5305307 Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths
04/12/1994US5303307 Adjustable filter for differential microphones
04/06/1994EP0590903A1 Output limiter for class-D BICMOS hearing aid output amplifier
04/02/1994CA2343560A1 Sound processing apparatus
03/1994
03/29/1994CA2032848C Automatic calibrating apparatus and method for second-order gradient microphone
03/22/1994US5297212 Loudspeaker system installed on an automobile door and including a woofer and a tweeter
03/22/1994US5297211 Acoustic device for custom installation
03/22/1994US5297210 Microphone actuation control system
03/22/1994US5297034 Telepathology diagnostic network
03/22/1994CA1328004C Aircraft cabin noise control apparatus
03/17/1994WO1994006246A1 Moving picture encoder
03/15/1994US5295192 Electronic noise attenuation method and apparatus for use in effecting such method
03/02/1994EP0584649A1 Circuit for electro-acoustic devices
03/02/1994EP0584346A1 Loudspeaker arrangement with frequency dependent amplitude regulation