| Patents for H04R 3 - Circuits for transducers (18,190) | 
|---|
| 04/07/1998 | US5737428 For detecting the highest relative signal of input signals | 
| 04/07/1998 | US5737409 Echo removing apparatus | 
| 04/02/1998 | WO1998013942A1 Vehicular loudspeaker system | 
| 04/01/1998 | EP0833302A2 Sound field reproducing device | 
| 03/31/1998 | US5734729 Apparatus for eliminating audio noise when power is cycled to a computer | 
| 03/31/1998 | US5734728 Portable sound speaker system and driving circuit therefor | 
| 03/31/1998 | US5734715 Process and device for adaptive identification and adaptive echo canceller relating thereto | 
| 03/31/1998 | US5734320 Emergency warning gear having a multitude of functions | 
| 03/25/1998 | EP0831458A2 Method and apparatus for separation of sound source, program recorded medium therefor, method and apparatus for detection of sound source zone; and program recorded medium therefor | 
| 03/24/1998 | US5732143 Noise cancellation apparatus | 
| 03/24/1998 | US5732142 Musical sound reproduction controller with two-stage adjustment of tone | 
| 03/17/1998 | US5729614 For amplifying a sound while suppressing a howling noise | 
| 03/17/1998 | US5729611 Loudspeader overload protection | 
| 03/11/1998 | EP0648166B1 Process and circuitry for supplying signals to loudspeakers and other electric consumers arranged in vehicle doors | 
| 03/11/1998 | CN1176042A Apparatus and method for adaptively precompensating for loudspeaker distortions | 
| 03/05/1998 | WO1998009477A1 Signal correcting device, signal correcting method, and coefficient adjusting device and coefficient adjusting method for signal correcting device | 
| 03/05/1998 | DE19635878A1 Device for improving the transmission signal of an echo reduction device e.g. for open line telephone system | 
| 03/04/1998 | EP0826140A1 Intensity acoustic calibrator | 
| 03/04/1998 | CN2275750Y Contactless electric horn | 
| 03/03/1998 | US5724485 Adaptive cross correlator apparatus comprising adaptive controller for adaptively adjusting transfer functions of two filters | 
| 03/03/1998 | CA2122371C Moving picture coding apparatus | 
| 02/25/1998 | EP0824845A1 Process for controlling a programmable or program-controlled hearing aid for its in-situ fitting adjustment | 
| 02/25/1998 | EP0824786A1 Audio crossover circuit | 
| 02/25/1998 | CN1174623A Voice activity detection | 
| 02/24/1998 | US5721784 Asymmetrical driver for asymmetrical loudspeakers | 
| 02/19/1998 | WO1998007294A1 High back emf, high pressure subwoofer | 
| 02/19/1998 | WO1998007234A1 Apparatus and methods for the harmonic enhancement of electronic audio signals | 
| 02/19/1998 | CA2263177A1 High back emf, high pressure subwoofer | 
| 02/19/1998 | CA2262736A1 Apparatus and methods for the harmonic enhancement of electronic audio signals | 
| 02/18/1998 | CN2274854Y Frequence modulated receiver of wireless microphone | 
| 02/12/1998 | WO1997049196A3 Echo suppressor and non-linear processor of echo canceller | 
| 02/12/1998 | DE19733888A1 Electric circuit for emphasising an audio zoom signal e.g. for camcorder | 
| 02/11/1998 | EP0823829A2 Digital hearing aid system | 
| 02/11/1998 | CN1173105A Pseudo-zero impedance loudspeaking technology and loudspeaking system | 
| 02/11/1998 | CN1173007A Circuit for emphasizing audio zooming signal | 
| 02/10/1998 | US5717773 Sound system gain and equalization circuit | 
| 02/10/1998 | US5717772 Method and apparatus for suppressing acoustic feedback in an audio system | 
| 02/10/1998 | US5717766 Stereophonic sound reproduction apparatus using a plurality of loudspeakers in each channel | 
| 02/07/1998 | CA2212131A1 Digital hearing aid system | 
| 02/05/1998 | WO1998005135A1 Acoustic feedback elimination using adaptive notch filter algorithm | 
| 02/04/1998 | CN1172573A Noise cancellation headset for use with stand or worn on ear | 
| 02/04/1998 | CN1172422A Noise cancellation apparatus | 
| 02/03/1998 | US5715321 Noise cancellation headset for use with stand or worn on ear | 
| 02/03/1998 | US5715319 Method and apparatus for steerable and endfire superdirective microphone arrays with reduced analog-to-digital converter and computational requirements | 
| 01/28/1998 | CN2273448Y Device for preventing accomplice from ganging up to make a false confession | 
| 01/22/1998 | WO1998002978A1 Acoustic heterodyne device and method | 
| 01/21/1998 | EP0820210A2 A method for elctronically beam forming acoustical signals and acoustical sensorapparatus | 
| 01/20/1998 | US5710823 Howling remover having cascade connected equalizers suppressing multiple noise peaks | 
| 01/15/1998 | WO1998001956A2 Microphone noise rejection system | 
| 01/15/1998 | WO1997025790A3 Noise cancellation and noise reduction apparatus | 
| 01/15/1998 | CA2259641A1 Microphone noise rejection system | 
| 01/14/1998 | EP0818122A1 Improvements in or relating to loudspeakers | 
| 01/14/1998 | EP0818121A1 Sound pick-up and reproduction system for a headset in a noisy environment | 
| 01/14/1998 | EP0818120A2 Audio bass speaker driver circuit | 
| 01/14/1998 | EP0772764B1 Process and device for determining the tonality of an audio signal | 
| 01/13/1998 | US5708354 Portable electromagnetic acoustic transducer pulser controller | 
| 01/08/1998 | DE19628014A1 Frequency dividing network for loudspeaker enclosures | 
| 01/07/1998 | EP0815641A1 Dual action automatic sound level control | 
| 01/06/1998 | US5706357 Sound signal output circuit and method | 
| 01/06/1998 | CA2071708C Audio surround system with stereo enhancement and directivity servos | 
| 12/31/1997 | CN1169092A Loud-speaker system | 
| 12/31/1997 | CN1169077A Apparatus and method for providing telephone user with control of threshold volume at which user's voice will take control of half-duplex speakerphone conversation | 
| 12/31/1997 | CN1169076A Telephone including electromechanical transducer, method of adapting frequency response of such transducer and method of coding melody | 
| 12/29/1997 | EP0814633A1 Digital loudspeaker with sound volume control | 
| 12/24/1997 | WO1997049196A2 Echo suppressor and non-linear processor of echo canceller | 
| 12/23/1997 | US5701352 Tone suppression automatic gain control for a headset | 
| 12/18/1997 | WO1997048253A1 Electroacoustic transducer | 
| 12/18/1997 | WO1997048252A1 Method and apparatus for localization of an acoustic source | 
| 12/18/1997 | CA2257447A1 Electroacoustic transducer | 
| 12/17/1997 | EP0813331A2 Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation | 
| 12/17/1997 | EP0813296A2 Amplifier arrangements with high damping factor | 
| 12/17/1997 | EP0812492A1 Dual audio program system | 
| 12/11/1997 | WO1997047090A1 An audio a/d converter using frequency modulation | 
| 12/11/1997 | CA2207529A1 Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation | 
| 12/10/1997 | EP0811301A1 Apparatus and method for adaptively precompensating for loudspeaker distortions | 
| 12/10/1997 | CN1167419A Sound equipment for vehicle | 
| 12/04/1997 | WO1997046048A1 Superdirective microphone arrays | 
| 12/04/1997 | WO1997045995A1 Arrangement for suppressing an interfering component of an input signal | 
| 12/03/1997 | EP0810810A2 Digital loudspeaker and sound reproduction system employing such a loudspeaker | 
| 12/03/1997 | EP0809906A1 Very low power cordless headset system | 
| 12/03/1997 | EP0809900A2 An adaptive noise cancelling arrangement, a noise reduction system and a transceiver | 
| 12/03/1997 | EP0809841A1 Voice activity detection | 
| 12/02/1997 | US5694476 Adaptive filter for correcting the transfer characteristic of electroacoustic transducer | 
| 12/02/1997 | US5694474 Adaptive filter for signal processing and method therefor | 
| 11/26/1997 | EP0809413A1 Audio devide for a vehicle | 
| 11/26/1997 | EP0809353A2 Amplifier for cancelling noise between circuit systems | 
| 11/25/1997 | US5692059 Two active element in-the-ear microphone system | 
| 11/25/1997 | US5692058 Dual audio program system | 
| 11/25/1997 | US5692057 Wireless electronic power defeat techniques | 
| 11/25/1997 | US5692051 Television receiver | 
| 11/25/1997 | CA2060661C Device for improving bass reproduction in loudspeaker systems with closed housing | 
| 11/19/1997 | EP0808076A1 Surround system | 
| 11/19/1997 | CN1165468A Thin wall coaxial multi-layer barrel-shaped louderspeaker box with audio-frequency amplifier capable of tuning according to sound chamber | 
| 11/18/1997 | US5689570 Sound reproducing array processor system | 
| 11/13/1997 | WO1997042789A1 Circuit, audio system and method for processing signals, and a harmonics generator | 
| 11/12/1997 | EP0806092A1 A directional acoustic signal processor and method therefor | 
| 11/05/1997 | EP0723733A4 Microphone system for teleconferencing system | 
| 11/05/1997 | CN2266851Y Wired and multiplex wireless microphone expanding device for audio-video compact disk machine | 
| 11/04/1997 | US5684882 System for selective sound capture for reverberant and noisy environment | 
| 10/30/1997 | WO1997040642A1 Six-axis surround sound processor with automatic balancing and calibration |