| Patents for H04R 3 - Circuits for transducers (18,190) |
|---|
| 10/13/1999 | EP0948787A1 Improved audio reproduction arrangement and telephone terminal |
| 10/13/1999 | EP0615387B1 Moving picture encoder |
| 10/07/1999 | DE19814971A1 Verfahren zur Störbefreiung eines Mikrophonsignals Method for eliminating interference of a microphone signal |
| 10/06/1999 | EP0948237A2 Method for noise suppression in a microphone signal |
| 09/30/1999 | WO1999049698A1 Method and device for operating a microphone system, especially in a motor vehicle |
| 09/30/1999 | DE19812697A1 Verfahren und Einrichtung zum Betrieb einer Mikrofonanordnung, insbesondere in einem Kraftfahrzeug Method and apparatus for operating a microphone system, in particular in a motor vehicle |
| 09/28/1999 | CA2149563C Transmitter-receiver having ear-piece type acoustic transducing part |
| 09/23/1999 | WO1999047998A1 Apparatus for sound reproduction |
| 09/23/1999 | WO1999041897A3 Method for improving acoustic noise attenuation in hand-free devices |
| 09/22/1999 | EP0943225A1 Power supply for microphone |
| 09/22/1999 | EP0943130A1 Method and device for non-stationary separation of signals of various sources |
| 09/22/1999 | EP0886990B1 Process and device for transmitting sound |
| 09/22/1999 | CN1229542A Acoustic heterodyne device and method |
| 09/16/1999 | WO1999046957A1 Microphone and receiver for automatic accompaniment |
| 09/16/1999 | DE19818611C1 Frequency range equalization method for microphone array e.g. for hands-free phone device in automobile |
| 09/16/1999 | DE19742803A1 Modification of a known electronic bass booster with loudspeaker protection, esp. for car radios |
| 09/15/1999 | EP0941631A1 Architecture for a universal serial bus-based pc speaker controller |
| 09/15/1999 | EP0682801B1 A noise reduction system and device, and a mobile radio station |
| 09/14/1999 | US5953434 Headband with audio speakers |
| 09/14/1999 | US5953432 Line source speaker system |
| 09/14/1999 | US5953431 Acoustic replay device |
| 09/14/1999 | US5953408 Telephone including an electromechanical transducer, method of adapting the frequency response of such a transducer and method of coding a melody |
| 09/14/1999 | CA2129102C Feedback level estimator between loudspeaker and microphone |
| 09/10/1999 | WO1999045743A1 Radio telecommunication terminal |
| 09/10/1999 | WO1999045741A2 Directional microphone system |
| 09/10/1999 | CA2288942A1 Radio telecommunication terminal |
| 09/08/1999 | EP0941013A1 Radio telecommunication terminal |
| 09/08/1999 | EP0901726A4 Microphone noise rejection system |
| 09/08/1999 | CN1228205A Apparatus and methods for harmonic enhancement of electronic audio signals |
| 09/07/1999 | US5949897 Sound reproduction device with active noise compensation |
| 09/02/1999 | DE19905826A1 Integrated stereophonic sound amplifier circuit |
| 09/01/1999 | EP0938830A1 Improved directional microphone audio system |
| 09/01/1999 | CN1227680A A audio A/D converter using frequency modulation |
| 08/26/1999 | DE19806015A1 Verfahren zur Verbesserung der akustischen Rückhördämpfung in Freisprecheinrichtungen A method for improving the acoustic sidetone suppression in hands-free |
| 08/25/1999 | CN2335331Y Infrared ray microphone device |
| 08/19/1999 | WO1999041943A1 Loudspeaker with movable virtual point source |
| 08/19/1999 | WO1999041898A1 Method for improving acoustic noise attenuation in hand-free devices |
| 08/19/1999 | WO1999041897A2 Method for improving acoustic noise attenuation in hand-free devices |
| 08/19/1999 | DE19901835A1 Self-tuning crystal notch filter for removing a signal of predefined frequency from an analogue reception signal in an ultrasonic imaging system |
| 08/19/1999 | DE19804992C1 Loudspeaker drive circuit |
| 08/18/1999 | EP0936837A2 Electroacoustic transducer of digital type |
| 08/17/1999 | US5940520 Power circuit for condenser microphone |
| 08/17/1999 | US5940518 In a vehicle radio |
| 08/17/1999 | US5940499 Voice switch used in hands-free communications system |
| 08/17/1999 | US5940118 System and method for steering directional microphones |
| 08/12/1999 | WO1999027522A3 Audio processing arrangement with multiple sources |
| 08/12/1999 | DE19805942C1 Verfahren zur Verbesserung der akustischen Rückhördämpfung in Freisprecheinrichtungen A method for improving the acoustic sidetone suppression in hands-free |
| 08/10/1999 | US5937074 High back emf, high pressure subwoofer having small volume cabinet, low frequency cutoff and pressure resistant surround |
| 08/10/1999 | US5937072 Audio crossover circuit |
| 08/10/1999 | US5937071 Sound field expanding apparatus with improved tone control system |
| 08/10/1999 | US5937070 Noise cancelling systems |
| 08/10/1999 | US5937009 Sub-band echo canceller using optimum wavelet packets and cross-band cancellation |
| 08/05/1999 | WO1999039545A2 Directional microphone assembly for mounting behind a surface |
| 08/05/1999 | WO1999039497A1 Generating calibration signals for an adaptive beamformer |
| 08/05/1999 | WO1998056208A3 Cabin communication system |
| 08/04/1999 | EP0801785A4 Industrial headset |
| 08/03/1999 | US5933506 Transmitter-receiver having ear-piece type acoustic transducing part |
| 08/03/1999 | CA2174271C Microphone selection process for use in a multiple microphone voice actuated switching system |
| 08/03/1999 | CA2050843C Noise eliminating element and electrical circuit having the same |
| 07/29/1999 | WO1999038355A1 Method and arrangement for voice communications |
| 07/27/1999 | US5930733 Stereophonic image enhancement devices and methods using lookup tables |
| 07/27/1999 | US5930374 Phase coherent crossover |
| 07/27/1999 | US5930373 Method and system for enhancing quality of sound signal |
| 07/22/1999 | WO1999037120A1 Microphone apparatus for producing signals for surround reproduction |
| 07/22/1999 | WO1999037119A1 Feedback control circuit |
| 07/21/1999 | EP0929825A1 Two-dimensional array transducer and beamformer |
| 07/21/1999 | CN2330132Y Combined multifunctional earphone |
| 07/15/1999 | WO1999035883A1 Thin loudspeaker |
| 07/15/1999 | WO1999035882A1 Audio signal processors |
| 07/15/1999 | WO1999035881A1 Loudspeaker device and method for driving the same, and audio signal transmitter/receiver |
| 07/15/1999 | WO1999022366A3 Improved audio reproduction arrangement and telephone terminal |
| 07/14/1999 | CN1223036A Echo suppressor and non-linear processor of echo canceller |
| 07/13/1999 | US5923766 Low frequency audio conversion circuit |
| 07/13/1999 | US5923576 Parallel recursive digital filters |
| 07/13/1999 | CA2157418C Beamformer using coefficient restrained adaptive filters for detecting interference signals |
| 07/07/1999 | CN2328142Y Hi-Fi stereo amplifier |
| 07/06/1999 | US5920633 Thin-wall multi-concentric cylinder speaker enclosure with audio amplifier tunable to listening room |
| 07/01/1999 | WO1999033324A1 Digital and analog directional microphone |
| 07/01/1999 | WO1999033201A1 System and method for factoring a merged wave field into independent components |
| 07/01/1999 | WO1999033173A1 Method and system for driving speakers with a 90 degree phase shift |
| 06/29/1999 | US5918203 Method and device for determining the tonality of an audio signal |
| 06/29/1999 | US5917923 Loudspeaker system |
| 06/29/1999 | US5917922 Method of operating a single loud speaker drive system |
| 06/29/1999 | US5917921 Noise reducing microphone apparatus |
| 06/24/1999 | WO1999031932A1 Mechanical acoustic crossover network and transducer therefor |
| 06/17/1999 | WO1999030534A1 Peak to peak signal detector for audio system |
| 06/17/1999 | WO1999030414A1 Apparatus and methods for enhancing electronic audio signals |
| 06/17/1999 | WO1999009787A8 A distributed stereo system |
| 06/17/1999 | CA2313695A1 Apparatus and methods for enhancing electronic audio signals |
| 06/15/1999 | CA2157652C Method of operating an ultrasonic piezoelectric transducer and circuit arrangement for performing the method |
| 06/08/1999 | US5910996 Dual audio program system |
| 06/08/1999 | US5910994 Method and apparatus for suppressing acoustic feedback in an audio system |
| 06/08/1999 | US5910990 Apparatus and method for automatic equalization of personal multi-channel audio system |
| 06/08/1999 | US5910115 Method and apparatus for coherence filtering of ultrasound images |
| 06/03/1999 | WO1999027754A1 A system for a monolithic directional microphone array and a method of detecting audio signals |
| 06/03/1999 | WO1999027522A2 Audio processing arrangement with multiple sources |
| 06/02/1999 | EP0919107A1 High back emf, high pressure subwoofer |
| 06/02/1999 | EP0919096A1 Method for cancelling multichannel acoustic echo and multichannel acoustic echo canceller |
| 06/02/1999 | CN2322343Y Microphone capable of circulation recording/playing |
| 06/02/1999 | CN1218603A Process and device for transmitting sound |