| Patents for H04R 3 - Circuits for transducers (18,190) |
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| 08/04/2004 | CN1518395A Electroacoustical transducing by low frequency augmenting devices |
| 08/04/2004 | CN1161000C Mechanical acoustic dividing network and transducer thereof |
| 08/04/2004 | CN1160998C Digital and analog directional microphone |
| 08/04/2004 | CN1160996C Earphone device for providing dynamic voice with vibration and method for the same device |
| 08/04/2004 | CN1160857C Electric circuit apparatus for producing output signal |
| 08/04/2004 | CN1160696C Synchronous device and method for compressed audio/video frequency signal receiver |
| 08/03/2004 | US6771784 Sub woofer system |
| 08/03/2004 | US6771781 Amplifier, at least one loudspeaker, a pair of connectors between the amplifier and the loudspeaker, and a reactive component wired in parallel with a resistor connected to one of the pair of connectors between the amplifier and |
| 08/03/2004 | US6771771 Method and device for echo cancellation |
| 08/03/2004 | US6771769 Method and apparatus for active reduction of speakerphone singing |
| 08/03/2004 | US6771701 Adaptive filter divergence control in echo cancelers by means of amplitude distribution evaluation with configurable hysteresis |
| 07/29/2004 | WO2004064449A1 Piezoelectric speaker, speaker system employing it, and electronic apparatus employing piezoelectric speaker |
| 07/29/2004 | WO2004064447A1 Loudspeaker system with extended output and field cancellation |
| 07/29/2004 | WO2004064444A2 Audio speaker crossover having two or more filter housings |
| 07/29/2004 | WO2003034780A8 Signal processing device for acoustic transducer array |
| 07/29/2004 | CA2512880A1 Audio speaker crossover having two or more filter housings |
| 07/28/2004 | EP1440603A2 Bass frequency amplifying apparatus |
| 07/28/2004 | EP1440601A2 Transponder with a changeable circuit configuration |
| 07/28/2004 | EP1285554B1 Directional microphone arrangement and method for signal processing in a directional microphone arrangement |
| 07/28/2004 | CN1159948C Device and method for processing speech |
| 07/27/2004 | US6768803 Method and apparatus for selective acoustic signal filtering |
| 07/22/2004 | WO2004062283A1 Digital television transmitter and receiver for transmitting and receiving dual stream using 4 level vestigial side band robust data |
| 07/22/2004 | WO2004014104A3 Electroacoustic transducer with built in transducer circuit |
| 07/22/2004 | US20040143433 Speech communication apparatus |
| 07/22/2004 | US20040141418 Speaker distance detection apparatus using microphone array and speech input/output apparatus |
| 07/22/2004 | DE10359198A1 System und Verfahren mit Lauthörtelefon System and method with speakerphone |
| 07/22/2004 | DE10300507A1 Subwoofer has at least one rotary knob connected in force-locking manner to axle of control motor attached to subwoofer and addressed by controller that receives its information from input device |
| 07/21/2004 | EP1439526A2 Adaptive beamforming method and apparatus using feedback structure |
| 07/21/2004 | EP1438871A1 Device for capturing and restoring sound using several sensors |
| 07/21/2004 | EP1438870A1 Interference cancelling method and system for multisensor antenna |
| 07/21/2004 | EP1438833A2 Device and method for multichannel acoustic echo cancellation with a variable number of channels |
| 07/21/2004 | EP1438785A2 Method and circuit for creating a sub-harmonic of a periodic signal |
| 07/21/2004 | EP0962120B8 High-fidelity and high-efficiency analog amplifier combined with digital amplifier |
| 07/21/2004 | CN2627775Y Loudspeaker apparatus |
| 07/21/2004 | CN2627774Y Six-channel supper bass vibrating earphone structure |
| 07/21/2004 | CN1515129A Solid angle corss-talk cancellation for beam forming arrays |
| 07/21/2004 | CN1158898C Means for bass enhancement in audio system |
| 07/21/2004 | CN1158643C Pressure gradient microphone |
| 07/20/2004 | US6766033 Modular bass arraying |
| 07/20/2004 | US6766029 Method for electronically selecting the dependency of an output signal from the spatial angle of acoustic signal impingement and hearing aid apparatus |
| 07/20/2004 | US6766025 Intelligent speaker training using microphone feedback and pre-loaded templates |
| 07/15/2004 | US20040137846 Method for fast dynamic estimation of background noise |
| 07/15/2004 | US20040136546 Tone converter and tone converting method of the same |
| 07/15/2004 | US20040136541 Hearing aid device, and operating and adjustment methods therefor, with microphone disposed outside of the auditory canal |
| 07/15/2004 | US20040136540 Sound apparatus, method of changing sound characteristics, and data recording medium on which a sound correction program |
| 07/14/2004 | EP1437029A1 Passive and active escapement for sound resonance |
| 07/14/2004 | EP1437028A2 Signal processing device for acoustic transducer array |
| 07/14/2004 | EP1436958A1 A digital implementation of multi-channel demodulators |
| 07/14/2004 | EP1436812A1 Multi-media apparatus |
| 07/14/2004 | CN1513278A Detecting voiced and unvoiced speech using both acoustic and nonacoustic sensors |
| 07/14/2004 | CN1512823A Sound device, method for changing sound property |
| 07/14/2004 | CN1157995C Echo eliminating device and method thereof |
| 07/14/2004 | CN1157991C Speaker device |
| 07/13/2004 | US6763113 Speaker driving circuit |
| 07/13/2004 | CA2301216C A method for electronically beam forming acoustical signals and acoustical sensor apparatus |
| 07/08/2004 | WO2004057914A1 Microphone system with directional response |
| 07/08/2004 | US20040133426 Vocal sound input apparatus for automotive vehicle |
| 07/08/2004 | US20040133291 Digital mixer and control method for digital mixer |
| 07/08/2004 | US20040131338 Method of reproducing audio signal, and reproducing apparatus therefor |
| 07/08/2004 | US20040131205 Device for monitoring musical performances and/or audio signals from video games or similar |
| 07/08/2004 | US20040131201 Multiple wireless microphone speakerphone system and method |
| 07/08/2004 | US20040131197 Method for adaptive control of multichannel acoustic echo cancellation system and device therefor |
| 07/08/2004 | US20040131192 System and method for integral transference of acoustical events |
| 07/08/2004 | US20040130565 Assist diplay apparatus for use with audio mixer |
| 07/08/2004 | DE10043064B4 Verfahren und Vorrichtung zur Elimination von Lautsprecherinterferenzen aus Mikrofonsignalen Method and apparatus for eliminating interference from speaker microphone signals |
| 07/08/2004 | CA2451285A1 Multiple wireless microphone speakerphone system and method |
| 07/07/2004 | EP1435137A1 Apparatus and method for level-dependent companding for wireless audio noise reduction |
| 07/07/2004 | CN2624570Y Active servo low-distortion loud-speaker system |
| 07/07/2004 | CN2624569Y Telephone wow converter |
| 07/07/2004 | CN1511430A Howling control device and howling control method |
| 07/06/2004 | US6760690 Background noise eliminating apparatus and method, and storage medium storing program realizing such method |
| 07/06/2004 | US6760451 Compensating filters |
| 07/06/2004 | US6760450 Microphone array apparatus |
| 07/06/2004 | US6760449 Microphone array system |
| 07/06/2004 | US6760436 Echo canceling apparatus determining dynamically changing echo component |
| 07/01/2004 | WO2004056153A1 Audio information support system |
| 07/01/2004 | US20040125966 Feedback compensation method and circuit for an acoustic amplification system, and hearing aid device employing same |
| 07/01/2004 | US20040125703 Play-back device |
| 07/01/2004 | US20040125694 Acoustic device |
| 07/01/2004 | US20040125487 Digital audio precompensation |
| 07/01/2004 | DE10259393A1 Amplifier circuit especially low frequency amplifier has passive frequency diplexer that divides signal amplified by power amplifier into two paths and has passive negative feedback between frequency diplexer and power amplifier |
| 06/30/2004 | EP1433361A2 Sound reproduction systems |
| 06/30/2004 | EP1433359A1 Dynamic range compression using digital frequency warping |
| 06/30/2004 | EP1433354A2 Dynamic carrier system for parametric arrays |
| 06/30/2004 | CN2622973Y Full-frequency constant loudspeakers |
| 06/30/2004 | CN1509583A Electric-acoustic coversion apparatus |
| 06/30/2004 | CN1509117A Earphone with volume protection |
| 06/29/2004 | US6757399 Anti-noise-electret pick-up with an electret |
| 06/29/2004 | US6757397 Method for controlling the sensitivity of a microphone |
| 06/29/2004 | US6757395 Noise reduction apparatus and method |
| 06/29/2004 | US6757394 Microphone array |
| 06/29/2004 | US6757385 Symmetry based subband acoustic echo cancellation |
| 06/24/2004 | WO2004054321A1 Audio signal reproducing method and reproducing apparatus |
| 06/24/2004 | WO2004054319A1 Method and device for measuring sound wave propagation time between loudspeaker and microphone |
| 06/24/2004 | WO2004054316A1 Resonance frequency sensing method, resonance frequency selecting method, and resonance frequency sensor |
| 06/24/2004 | WO2004054314A1 Array speaker equipped with projection screen |
| 06/24/2004 | WO2004054099A1 A fully parametric equalizer |
| 06/24/2004 | US20040122544 Delta-sigma modulator, method of switching delta-sigma modulator, and digital amplifier |
| 06/24/2004 | US20040122543 Method of selecting a frequency band of an output audio signal by a computer |
| 06/24/2004 | US20040120535 Audio signal processing |