| Patents for H04R 3 - Circuits for transducers (18,190) |
|---|
| 10/30/1997 | DE19715498A1 Stereo acoustic image enhancement device |
| 10/23/1997 | DE19615862A1 Loud-speaker system drive circuit |
| 10/22/1997 | EP0802699A2 Method for electronically enlarging the distance between two acoustical/electrical transducers and hearing aid apparatus |
| 10/22/1997 | EP0801785A1 Industrial headset |
| 10/22/1997 | CN1162896A Electric signal and accoustic signal converter |
| 10/21/1997 | US5680465 Personal portable communication device |
| 10/16/1997 | WO1997038552A1 Acoustic feedback correction |
| 10/15/1997 | EP0681717A4 Battery drain reducer. |
| 10/15/1997 | EP0651907B1 Method and device for active noise reduction in a local area |
| 10/14/1997 | US5677987 Feedback detector and suppressor |
| 10/09/1997 | WO1997037512A1 Six-axis surround sound processor with improved matrix and cancellation control |
| 10/08/1997 | CN2264455Y Single carrier wave wireless remote-control microphone |
| 10/07/1997 | US5675658 Active noise reduction headset |
| 10/07/1997 | US5675655 Sound input apparatus |
| 10/07/1997 | US5675296 Capacitive-component reducing circuit in electrostatic-type transducer means |
| 10/02/1997 | WO1997036458A1 Three-dimensional sound reproduction system |
| 10/02/1997 | WO1997036454A1 Process and arrangement for converting an acoustic signal to an electrical signal |
| 10/02/1997 | WO1997036391A1 Computer controlled home entertainment system |
| 10/02/1997 | DE19612068A1 Verfahren und Anordnung zum Umwandeln eines akustischen Signals in ein elektrisches Signal Method and apparatus for converting an acoustic signal into an electrical signal |
| 10/02/1997 | CA2250189A1 Computer controlled home entertainment system |
| 10/01/1997 | EP0797875A1 An adaptive filter for signal processing and method therefor |
| 09/30/1997 | US5673326 Audio bass speaker driver circuit |
| 09/30/1997 | US5673325 Noise cancellation apparatus |
| 09/24/1997 | EP0797339A2 Method and circuit for improving the transmission properties of a transmission link subjected to echo in a telecommunication network |
| 09/18/1997 | WO1997034441A1 Process and device for transmitting sound |
| 09/18/1997 | CA2248019A1 Process and device for transmitting sound |
| 09/17/1997 | EP0796033A1 Telephone provided with an electromechanical transducer, method for adapting the frequency response of such a transducer and method for coding a melody |
| 09/17/1997 | EP0795851A2 Method and system for microphone array input type speech recognition |
| 09/17/1997 | CN1159725A Induction type audio-frequency divider |
| 09/17/1997 | CN1035917C Microphone of video camera |
| 09/16/1997 | US5668885 Low frequency audio conversion circuit |
| 09/16/1997 | US5668883 Headphone apparatus including an equalizer system having an open loop characteristic with a rising slope outside the cancellation band |
| 09/10/1997 | EP0794686A2 Microphone with associated amplifier |
| 09/10/1997 | EP0793896A1 Audio signal reproduction apparatus |
| 09/09/1997 | US5666428 For use in a facility |
| 09/09/1997 | US5666424 Six-axis surround sound processor with automatic balancing and calibration |
| 09/03/1997 | EP0792568A1 Noise cancellation apparatus |
| 09/03/1997 | EP0792567A1 Noise cancellation headset for use with stand or worn on ear |
| 09/03/1997 | EP0732034B1 Improvement to a power amplifier/loudspeaker interface |
| 09/02/1997 | US5664021 Microphone system for teleconferencing system |
| 09/02/1997 | US5664019 Systems for feedback cancellation in an audio interface garment |
| 09/02/1997 | US5664014 Two-way communications earset |
| 08/28/1997 | WO1997031506A1 Acoustic element and method for sound processing |
| 08/28/1997 | WO1997031439A1 Systems for feedback cancellation in an audio interface garment |
| 08/27/1997 | EP0791279A1 Loudspeaker system with controlled directional sensitivity |
| 08/21/1997 | WO1997030564A1 Electronic acoustic device |
| 08/20/1997 | CN1157522A Echo Removing apparatus |
| 08/19/1997 | US5659662 Processor controlled system |
| 08/14/1997 | WO1997029614A1 Directional microphone utilizing spaced-apart omni-directional microphones |
| 08/14/1997 | WO1997023068A3 An adaptive noise cancelling arrangement, a noise reduction system and a transceiver |
| 08/13/1997 | EP0789472A2 Telephone handset interface with feedback control |
| 08/13/1997 | EP0788722A1 Apparatus and method of enhancing audio signals |
| 08/12/1997 | US5657393 Beamed linear array microphone system |
| 08/12/1997 | US5657349 Method and apparatus capable of quickly identifying an unknown system with a final error reduced |
| 08/08/1997 | CA2169029A1 Loudspeaker overload protection |
| 08/07/1997 | WO1997028123A1 Distamycin derivatives, process for preparing them, and their use as antitumor and antiviral agents |
| 08/06/1997 | CN2259033Y Sound controller capable of control of tone and dynamics |
| 08/05/1997 | US5655058 Segmentation of audio data for indexing of conversational speech for real-time or postprocessing applications |
| 07/31/1997 | WO1997027723A1 Sound pick-up and reproduction system for a headset in a noisy environment |
| 07/31/1997 | CA2214094A1 Sound pick-up and reproduction system for a headset in a noisy environment |
| 07/30/1997 | EP0786920A1 Transmission system of correlated signals |
| 07/30/1997 | CN1155724A Contactless electric horn |
| 07/24/1997 | WO1997026715A1 Enhanced concert audio process utilizing a synchronized headgear system |
| 07/24/1997 | DE19609554C1 Transmission of tape-recorded music and speech to a listener |
| 07/24/1997 | DE19601786A1 Pneumatic audio graph linearisation for music reproduction |
| 07/24/1997 | CA2242397A1 Enhanced concert audio process utilizing a synchronized headgear system |
| 07/23/1997 | EP0785501A2 Apparatus for eliminating audio noise when power is cycled to a computer |
| 07/17/1997 | WO1997025833A1 A method of correcting non-linear transfer behaviour in a loudspeaker |
| 07/17/1997 | WO1997025790A2 Noise cancellation and noise reduction apparatus |
| 07/16/1997 | EP0784386A2 Wireless audio signal transmission system |
| 07/16/1997 | CA2167219A1 Active speaker system with automatic power on/off capability |
| 07/15/1997 | US5649019 Digital apparatus for reducing acoustic feedback |
| 07/15/1997 | US5649015 Speaker simulator |
| 07/10/1997 | WO1997009842A3 Acoustic device |
| 07/10/1997 | DE4227601C1 Call tone control for telephone handset |
| 07/08/1997 | US5647006 Mobile radio terminal comprising a speech |
| 07/08/1997 | US5647005 Pitch and rate modifications of audio signals utilizing differential mean absolute error |
| 07/03/1997 | DE19705898A1 Cycle time error compensation circuit |
| 07/02/1997 | EP0782369A2 Method and apparatus for controlling the output level of the loudspeakers in a vehicle |
| 07/02/1997 | EP0781446A1 Directional ear device with adaptive bandwidth and gain control |
| 07/01/1997 | US5644641 Noise cancelling device capable of achieving a reduced convergence time and a reduced residual error after convergence |
| 06/26/1997 | WO1997023068A2 An adaptive noise cancelling arrangement, a noise reduction system and a transceiver |
| 06/26/1997 | WO1997023005A1 Resonant coupled transducer drive |
| 06/26/1997 | DE19548149A1 In-car audio device with adjustable voice frequency characteristic |
| 06/25/1997 | EP0781071A1 Method to control a buzzer |
| 06/25/1997 | EP0781070A1 Acoustic antenna for computer workstation |
| 06/25/1997 | CN1152830A Noise controllable mobile telephone |
| 06/24/1997 | US5642425 Sound field control device |
| 06/24/1997 | US5642424 Device for connecting external sound generator |
| 06/19/1997 | WO1997022226A1 Speaker and amplifier system |
| 06/19/1997 | DE19547093A1 Circuit for improvement of noise immunity of audio signal |
| 06/18/1997 | EP0779732A2 Multi-point voice conferencing system over a wide area network |
| 06/18/1997 | EP0779706A2 Circuitry for improving signal to noise ratio |
| 06/18/1997 | EP0779014A1 Device for controlling the volume of a car radio dependently upon the ambient noise |
| 06/18/1997 | CN1152159A Digital multi-tone contactless electronic vehicle horn |
| 06/12/1997 | WO1997021322A1 Portable speakers with phased arrays |
| 06/12/1997 | DE19650521A1 Protective circuit for audio amplifier |
| 06/10/1997 | US5637947 Method and apparatus for operating a generator supplying a high-frequency power to an ultrasonic transducer |
| 06/05/1997 | WO1997020449A1 Method for reproducing ball sounds during a sporting event, and ball therefor |
| 06/04/1997 | EP0777404A1 System for attenuation of noise |