| Patents for H04R 3 - Circuits for transducers (18,190) |
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| 02/05/2004 | DE10325430A1 Signalverarbeitunssystem und zugehöriges Verfahren Signalverarbeitunssystem and associated method |
| 02/04/2004 | EP1386415A1 Parametric virtual speaker and surround-sound system |
| 02/04/2004 | EP0943130B1 Method for non-stationary separation of signals of various sources |
| 02/04/2004 | CN1473451A Portable multi-channel amplifier |
| 02/04/2004 | CN1473430A Mixed-media telecommunication call set-up |
| 02/04/2004 | CN1137601C Power supply for microphone |
| 02/03/2004 | US6687380 Active sub-woofer speaker system |
| 02/03/2004 | US6687379 System and method for adjusting the low-frequency response of a crossover that supplies signal to subwoofers in response to main-speaker low-frequency characteristics |
| 02/03/2004 | US6687187 Method for directional location and locating system |
| 02/03/2004 | US6686833 Compound acoustic actuator drive circuit and portable information terminal |
| 02/03/2004 | CA2273858C Power supply for microphone |
| 01/31/2004 | CA2436388A1 Sound processing system using distortion limiting techniques |
| 01/29/2004 | US20040019277 Digital receive-focusing apparatus using analogue multiplexers |
| 01/29/2004 | US20040017921 Electrical impedance based audio compensation in audio devices and methods therefor |
| 01/29/2004 | DE10328827A1 Sende- und Empfangsisolation für ein Ultraschallabtasten und Verfahren der Verwendung Transmit and receive isolation for an Ultraschallabtasten and methods of use |
| 01/28/2004 | CN1136759C Audio signal controller and reproducing device comprising the same |
| 01/27/2004 | US6683964 Direction finder |
| 01/27/2004 | US6683962 Method and system for driving speakers with a 90 degree phase shift |
| 01/27/2004 | US6683961 Process and apparatus for eliminating loudspeaker interference from microphone signals |
| 01/22/2004 | WO2004008804A1 Electronic devices, methods of operating the same, and computer program products for detecting noise in a signal based on a combination of spatial correlation and time correlation |
| 01/22/2004 | WO2003061344A3 Multichannel echo canceller system using active audio matrix coefficients |
| 01/22/2004 | US20040015252 Audio signal processing device |
| 01/22/2004 | US20040013275 Apparatus and method for estimating the direction of arrival of a source signal using a microphone array |
| 01/22/2004 | US20040013274 Circuit for providing a high-voltage audio signal to an electrostatic loudspeaker and method of operating the same |
| 01/22/2004 | US20040012440 Circuit and method for a transimpedance audio amplifier providing variable gain while maintaining load impedance |
| 01/22/2004 | US20040011191 Method and circuit for creating a sub-harmonic of a periodic signal |
| 01/21/2004 | CN1470147A Method and apparatus for filtering & compressing sound signals |
| 01/21/2004 | CN1469684A Method and apparatus for generating multi-sound channel sound |
| 01/21/2004 | CN1469683A Hand-free earphone for mobile phone and external blue-tooth module |
| 01/21/2004 | CN1135753C Adaptive noise cancelling arrangement, noise reduction system and transceiver |
| 01/21/2004 | CN1135525C Apparatus for processing microphone signal of karaoke equipment |
| 01/20/2004 | US6681020 Microphone circuit with mute and keep alive function |
| 01/20/2004 | US6681019 Polarity determining circuit for loudspeakers, an audio circuit having a function of determining polarities of loudspeakers, and an audio circuit having functions of determining polarities of loudspeakers and switching the polarities |
| 01/15/2004 | US20040008850 Electronic devices, methods of operating the same, and computer program products for detecting noise in a signal based on a combination of spatial correlation and time correlation |
| 01/15/2004 | US20040008847 Method and apparatus for producing multi-channel sound |
| 01/15/2004 | DE10230480A1 Akustische Erfassungsvorrichtung Acoustic detection device |
| 01/14/2004 | EP1381254A2 Method and apparatus for producing multi-channel sound |
| 01/14/2004 | EP1380187A1 Directional controller and a method of controlling a hearing aid |
| 01/14/2004 | EP1380186A2 Vehicle accessory microphone |
| 01/14/2004 | CN2599886Y Digital voice mixing device |
| 01/14/2004 | CN1134767C Muffle module and speech recognition apparatus and consumer electronics system |
| 01/13/2004 | US6678381 Ultra-directional speaker |
| 01/13/2004 | US6678380 Audio system |
| 01/08/2004 | WO2004004411A1 Piezoelectric biological sound monitor with printed circuit board |
| 01/08/2004 | WO2004004409A1 Mobile communication terminal |
| 01/08/2004 | WO2004004298A1 Echo processing devices for single-channel or multichannel communication systems |
| 01/08/2004 | WO2004004297A2 Stationary spectral power dependent audio enhancement system |
| 01/08/2004 | WO2004004178A1 Wireless audio signal transmission method for a three-dimensional sound system |
| 01/08/2004 | WO2004002383A1 Noise cancellation system and headphone therefor |
| 01/08/2004 | WO2003030589A3 Sound reproduction systems |
| 01/08/2004 | WO2003026343A3 Controller interface for directional sound system |
| 01/08/2004 | WO2002078388A3 Method and apparatus to create a sound field |
| 01/08/2004 | US20040005069 Dual range horn with acoustic crossover |
| 01/08/2004 | DE10228157B3 Hörgerätesystem mit einem Hörgerät und einer externen Prozessoreinheit Hearing aid system with a hearing aid and an external processor unit |
| 01/08/2004 | CA2490438A1 Piezoelectric biological sound monitor with printed circuit board |
| 01/07/2004 | EP1377961A2 Active noise cancelling headset and devices with selective noise suppression |
| 01/06/2004 | US6675125 Statistics generator system and method |
| 01/06/2004 | US6674866 Audio reproduction apparatus |
| 01/06/2004 | US6674865 Automatic volume control for communication system |
| 01/06/2004 | US6674864 Adaptive speaker compensation system for a multimedia computer system |
| 01/06/2004 | US6674863 Microphone-speaker apparatus |
| 01/06/2004 | US6674690 Acoustic transducer damping method |
| 01/02/2004 | EP1377123A1 Equalization for audio mixing |
| 01/02/2004 | EP1377118A2 Hearing aid system with hearing aid and external processing unit |
| 01/02/2004 | EP1377114A2 Multi-channel reproducing apparatus and multi-channel reproducing loudspeaker apparatus |
| 01/02/2004 | EP1377041A2 Integrated design for omni-directional camera and microphone array |
| 01/02/2004 | EP1376541A2 Extraction of external noise components |
| 01/02/2004 | EP1374635A1 Bone conduction hearing aid |
| 01/02/2004 | EP1372482A2 Ear microphone apparatus and method |
| 01/01/2004 | US20040002781 Methods and apparatuses for adjusting sonic balace in audio reproduction systems |
| 01/01/2004 | US20040002435 Transmit and receive isolation for ultrasound scanning and methods of use |
| 01/01/2004 | US20040001601 Electronic apparatus for adjusting brightness and flashing of lights in response to audio signals |
| 01/01/2004 | US20040001598 System and method for adaptive multi-sensor arrays |
| 01/01/2004 | US20040001137 Integrated design for omni-directional camera and microphone array |
| 12/31/2003 | WO2004001552A2 Identification system and method for recognizing any one of a number of different types of devices |
| 12/31/2003 | WO2003094570A3 Improvements in and relating to speaker systems |
| 12/31/2003 | WO2003071827A3 Compact surround-sound system |
| 12/31/2003 | WO2003065570A9 Modulator- amplifier |
| 12/31/2003 | CN2596442Y Electronic accordatura device |
| 12/31/2003 | CN1133352C Earphone |
| 12/30/2003 | US6671503 Wireless microphone system |
| 12/30/2003 | US6671379 Ear microphone apparatus and method |
| 12/30/2003 | US6671360 Intercom system for a building or apartment house |
| 12/25/2003 | US20030235319 Hearing aid system with a hearing aid and an external processor unit |
| 12/25/2003 | US20030235317 Equalization for audio mixing |
| 12/25/2003 | US20030235315 Digital microphone |
| 12/24/2003 | WO2003107719A1 Method of digital equalisation of a sound from loudspeakers in rooms and use of the method |
| 12/24/2003 | WO2003088711A3 Loudspeaker with gps receiver |
| 12/24/2003 | WO2003039115A3 Device and method for carrying out multichannel acoustic echo cancellation with a variable number of channels |
| 12/24/2003 | WO2003026350A3 Audio distributor |
| 12/24/2003 | CN2595117Y Dual-drive loudspeaker |
| 12/24/2003 | CN1463507A Echo processing appts. |
| 12/24/2003 | CN1132498C Loudspeaker phase distortion control using velocity feedback |
| 12/23/2003 | US6668062 FFT-based technique for adaptive directionality of dual microphones |
| 12/18/2003 | WO2003105525A1 P.a. system installation method |
| 12/18/2003 | WO2003105524A1 Method and system for reducing noise |
| 12/18/2003 | WO2003105111A1 Multi-section decoding lens |
| 12/18/2003 | WO2003104924A2 Acoustical virtual reality engine and advanced techniques for enhancing delivered sound |
| 12/18/2003 | WO2003103857A1 Electronic control circuit and acoustic-signal emitting device for vehicles |
| 12/18/2003 | WO2003009642A3 Method for at least two audio signals |