| Patents for H04R 3 - Circuits for transducers (18,190) |
|---|
| 03/02/1994 | EP0584299A1 Improved audio distribution system |
| 02/23/1994 | EP0583900A1 Improved headphone apparatus |
| 02/22/1994 | US5289355 Portable lighted microphone |
| 02/16/1994 | CN1082302A Application of time-shared correspondent accumulators and sound synthesizer to directly drive loudspeaker |
| 02/10/1994 | DE4326746A1 Stereo loudspeaker vol. control equipment responsive to ambient noise - provides feedback from both audio channel amplifiers via adaptive digital filters for subtraction from noise microphone signal |
| 02/10/1994 | DE4308307C1 Automatic switching device for multi-purpose loudspeaker system - uses relay energised by current from power supply circuit or mains socket of entertainment appts. to which priority is assigned |
| 02/09/1994 | CN2155646Y All-numbers reverberation microphone |
| 02/03/1994 | WO1994002935A1 Method and device for active noise reduction in a local area |
| 02/03/1994 | DE4308961A1 Vorrichtung zur aktiven Simulation einer akustischen Impedanz An active simulation of an acoustic impedance |
| 02/01/1994 | CA2043718C Speaker system enclosure integrated with amplifier circuit board |
| 01/27/1994 | DE4224404A1 Connection circuit between loudspeaker and output stage - connects passive bass tone and high tone divider networks directly to output stage terminals acoustically removed from loudspeaker |
| 01/26/1994 | CN2154577Y Channal unit for radio microphone |
| 01/26/1994 | CN1081307A Circuit for processing audio signal based on mechanical and electrical property of loudspeaker |
| 01/20/1994 | WO1994001304A1 Process and circuitry for supplying signals to loudspeakers and other electric consumers arranged in vehicle doors |
| 01/19/1994 | EP0579152A1 Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adapted filtering |
| 01/19/1994 | EP0578744A1 Minimum wire interface for multiple accessories |
| 01/19/1994 | CN1081057A Loudspeakers |
| 01/19/1994 | CN1080878A Electronic gaming device with pseude-stereophonic sound generating cap abilities |
| 01/18/1994 | US5280543 Acoustic apparatus and driving apparatus constituting the same |
| 01/18/1994 | CA1326285C Electronic filters, hearing aids and methods |
| 01/14/1994 | CA2098679A1 Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adaptive filtering |
| 01/13/1994 | DE4222465A1 Acoustic feedback susceptible electroacoustic system regulation - setting selected amplifier stage with feedback control off whenever system is put into operation. |
| 01/13/1994 | DE4222321A1 Verfahren und Schaltungsanordnung zum Versorgen von Lautsprechern und anderen elektrischen Verbrauchern in Fahrzeugtüren mit Signalen Method and circuit for supplying speakers and other electrical loads in vehicle doors with signals |
| 01/12/1994 | EP0578008A1 Vehicular radio receiver with speed compensated tone control |
| 12/29/1993 | EP0575598A1 Multi-zone audio distribution amplifier |
| 12/29/1993 | CN2151602Y “卡拉-ok”话筒 "Kara -ok" Mic |
| 12/23/1993 | WO1993026134A1 Stereophonic sound reproduction device using several loudspeakers in each channel |
| 12/23/1993 | CA2137695A1 Strereophonic sound reproduction device using several loudspeakers in each channel |
| 12/15/1993 | CN2149739Y Digital type arrangement for correcting frequency response |
| 12/14/1993 | US5271062 Device for noise attenuation of weaving machine |
| 12/14/1993 | US5270633 Ternary energy supply circuit with a high frequency rejection filter |
| 12/09/1993 | DE4318529A1 Application of sec. audio signal for noise suppression in prim. audio signal - filtering sec. signal according to set of coeffts. to generate determined noise signal |
| 12/08/1993 | CN1023052C Sound imaging system for video game |
| 12/01/1993 | EP0572303A1 Signal processing method and system |
| 12/01/1993 | EP0571635A1 Device for correcting frequency characteristic of sound field |
| 11/30/1993 | US5267321 Acoustical transceiver system |
| 11/29/1993 | CA2097136A1 Directional microphone system |
| 11/16/1993 | US5263188 In a vehicle sound system |
| 11/16/1993 | US5263019 Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone |
| 11/11/1993 | WO1993022890A1 Method and apparatus for attenuating acoustic feedback and improving sound definition in acoustic transducers |
| 11/11/1993 | WO1993020665A3 Electronic device for controlling a plurality of sound sources |
| 11/10/1993 | EP0569216A1 Microphone apparatus |
| 11/10/1993 | EP0568721A1 Loudspeaker filter |
| 11/09/1993 | US5260920 Acoustic space reproduction method, sound recording device and sound recording medium |
| 11/03/1993 | EP0348396B1 Radio receiver speech amplifier circuit |
| 11/03/1993 | CN1022649C Method and apparatus for magnetic transducing |
| 11/02/1993 | US5259035 Automatic microphone mixer |
| 10/27/1993 | EP0567061A1 Method and system for reproducing audio frequencies |
| 10/21/1993 | DE4212622A1 High-pass filter for loudspeaker in multichannel audio system - is specially matched for use in middle- and high-frequency path to implement acoustic high-pass characteristic of bass channel |
| 10/20/1993 | EP0566194A2 Conference system with automatic speaker detection and speaker unit for use in the conference system |
| 10/20/1993 | EP0565526A1 Adaptive acoustic echo canceller |
| 10/19/1993 | US5255322 Multi-zone audio distribution amplifier |
| 10/14/1993 | WO1993020665A2 Electronic device for controlling a plurality of sound sources |
| 10/14/1993 | DE4212528A1 Loudspeaker coupling circuit for power amplifier end stage - uses 2 power lines and 2 measuring lines for positive and negative loudspeaker signals |
| 10/13/1993 | EP0565479A1 Multi-channel signal separation using cross-polyspectra |
| 10/13/1993 | EP0565369A2 Loudspeakers |
| 10/13/1993 | EP0564874A1 Two-way communications earset with filter |
| 10/11/1993 | CA2093705A1 Loudspeakers |
| 10/05/1993 | US5251264 Mechanical-vibration-cancelling piezo ceramic microphone |
| 10/05/1993 | US5251260 Audio surround system with stereo enhancement and directivity servos |
| 09/30/1993 | WO1993019561A1 Mechanical-vibration-cancelling piezo ceramic microphone |
| 09/30/1993 | DE4307008A1 Acoustic field corrector using cascaded delay circuits - operates by addn. of outputs of cascaded combinations of echo-generating delay stages and coefft. multipliers |
| 09/29/1993 | EP0562738A2 Microphone power supply |
| 09/29/1993 | EP0561881A1 Compensating filters |
| 09/23/1993 | DE4215519C1 Hi-fi loudspeaker with foil membrane - has coils attached to membrane corresponding to radial magnetic field lines of concentric magnetic rings of drive system |
| 09/16/1993 | WO1993018626A1 Loudspeaker arrangement with frequency dependent amplitude regulation |
| 09/14/1993 | US5245668 Device for aurally compensated loudness control |
| 09/14/1993 | US5245665 Method and apparatus for adaptive audio resonant frequency filtering |
| 09/14/1993 | US5245664 Active noise control system for automotive vehicle |
| 09/08/1993 | CN1076072A Apparatus for adjusting of character of radio wave |
| 09/07/1993 | US5243661 Microphone apparatus |
| 09/07/1993 | US5243660 Directional microphone system |
| 09/07/1993 | US5243656 Audio circuit |
| 09/02/1993 | WO1993017510A1 Feedback level estimator between loudspeaker and microphone |
| 09/01/1993 | EP0558312A1 Adaptive noise reduction circuit for a sound reproduction system |
| 09/01/1993 | CN2141630Y 混响卡拉ok话筒 Karaoke microphone reverb ok |
| 08/31/1993 | US5241605 Tone control apparatus for front and rear channels |
| 08/25/1993 | EP0557166A1 Noise reduction method in a speech signal |
| 08/24/1993 | CA1321637C Microphone probe for acoustic measurement in turbulent flow |
| 08/11/1993 | EP0554848A1 Device comprising a piezoelectric transducer |
| 08/04/1993 | EP0553906A2 Method and apparatus for sound enhancement with envelopes of multiband passed signals feeding comb filters |
| 08/04/1993 | CN2139742Y Leakage alarm plug |
| 08/03/1993 | US5233664 Speaker system and method of controlling directivity thereof |
| 08/03/1993 | US5233661 Sound field variable apparatus |
| 07/28/1993 | CN1074795A Echo-adding circuit |
| 07/22/1993 | DE4200811A1 Acoustic reduction circuitry counteracting sound interference for ear muffs - compares microphone output signal with max. permissible sound pressure reference signal and generates counter phase signal |
| 07/20/1993 | US5230022 Low frequency compensating circuit for audio signals |
| 07/10/1993 | WO1993014611A1 Improved audio distribution system |
| 07/10/1993 | WO1993014575A1 Multi-zone audio distribution amplifier |
| 07/10/1993 | CA2105059A1 Audio distribution system |
| 07/10/1993 | CA2104947A1 Multi-zone audio distribution amplifier |
| 07/07/1993 | EP0550371A1 Method and system for associating audio components with positions on a data processing system display to produce audio outputs |
| 07/07/1993 | EP0550159A2 Loudspeaker for television set |
| 07/07/1993 | CN2137810Y Connecting apparatus for reverberation of frequency-modulated sound and tape sound of frequency-modulated recorder |
| 07/06/1993 | US5226089 Circuit and method for compensating low frequency band for use in a speaker |
| 07/06/1993 | US5226087 Microphone apparatus |
| 07/06/1993 | US5225836 Electronic filters, repeated signal charge conversion apparatus, hearing aids and methods |
| 07/06/1993 | CA1319891C Electro-acoustical system |
| 06/30/1993 | EP0548836A1 A bass reproduction speaker apparatus |
| 06/30/1993 | CN2137411Y Extended phone for radiotelephone |