Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 3 - Circuits for transducers
Patents for H04R 3 - Circuits for transducers (18,190)
10/2003
10/23/2003US20030197965 Digital audio precompensation
10/22/2003EP1355513A2 Enhanced Sound Processing System For Use With Sound Radiators
10/22/2003EP1355510A2 Loudspeaker arrangement and switching apparatus therefor
10/22/2003EP1355509A2 Digital audio precompensation
10/22/2003EP1355418A1 Audio superpositioning
10/22/2003EP1354401A1 Circuits and methods for controlling transients during audio device power-up and power-down, and systems using the same
10/22/2003CN2582309Y Hand-free receiver able to eliminate feedback voice and background echo
10/22/2003CN1451254A Infrabass
10/21/2003US6636611 Combined receiver and speaker
10/21/2003US6634455 Thin-wall multi-concentric sleeve speaker
10/19/2003CA2424157A1 Enhanced sound processing system for use with sound radiators
10/16/2003WO2003086016A1 Dual range horn with acoustic crossover
10/16/2003WO2003086014A1 Impedance converter for capacitor microphone
10/16/2003WO2003086009A1 Switched-geometry microphone array arrangement and method for processing outputs from a plurality of microphones
10/16/2003WO2003001843A3 Variable multi-dimensional apodization control for ultrasonic transducers
10/16/2003WO2002060122A3 Vehicle audio system
10/16/2003US20030194101 Audio superpositioning
10/16/2003US20030194099 Method and apparatus for processing microphone audio signals
10/16/2003US20030194098 Mid-range loudspeaker
10/15/2003EP1352509A1 Signal routing for reduced power consumption in a conferencing system
10/15/2003EP1352387A2 Systems and methods for controlling a phased array focused ultrasound system
10/15/2003CN1449261A Systems and methods for reducing secondary hot spots in a phased array focused ultrasound system
10/14/2003CA2261108C Acoustic heterodyne device and method
10/09/2003WO2003083828A1 Nicrophone and voice activity detection (vad) configurations for use with communication systems
10/09/2003WO2003036406A3 Apparatus and method of controlling signal levels
10/09/2003WO2002104067A3 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology
10/09/2003CA2479758A1 Microphone and voice activity detection (vad) configurations for use with communication systems
10/08/2003EP1351543A2 Speaker control apparatus and speaker system
10/08/2003CN1447624A Automatic audio system equalization
10/02/2003US20030185410 Orthogonal circular microphone array system and method for detecting three-dimensional direction of sound source using the same
10/02/2003US20030185409 Noise reduction method
10/02/2003US20030185405 Modulator processing for a parametric speaker system
10/02/2003US20030185404 Phased array sound system
10/02/2003US20030185403 Method of improving the audibility of sound from a louspeaker located close to an ear
10/01/2003EP1349427A2 Automatic audio equalising system
10/01/2003EP1349419A2 Orthogonal circular microphone array system and method for detecting three-dimensional direction of sound source using the same
10/01/2003EP1348314A1 Directional microphone
10/01/2003CN1122963C Method and apparatus for measuring signal level and delay at multiple sensors
09/2003
09/30/2003US6628793 Speaker system
09/30/2003US6628791 Signal derived bias supply for electrostatic loudspeakers
09/25/2003WO2003079725A2 Resonator device and associated circuits
09/25/2003WO2003079722A1 Active audio compressing in telecommunication
09/25/2003WO2003079721A1 Audio feedback processing system
09/25/2003WO2003079572A1 Parametric loudspeaker system for pre-encoded signal playback
09/25/2003WO2003079486A1 Beam forming array of transducers
09/25/2003WO2003061167A3 Digital linking of multiple microphone systems
09/25/2003WO2002013572A3 Method and apparatus for filtering and compressing sound signals
09/25/2003US20030179899 Loudspeaker with shaped sound field
09/25/2003US20030179891 Automatic audio system equalizing
09/25/2003US20030179890 Microphone array
09/24/2003EP1346600A2 Loudspeaker systems
09/24/2003EP1346552A1 A sound-based proximity detector for use in a mobile telephone apparatus
09/24/2003EP0801785B1 Communications headset
09/23/2003US6625287 Enhancing automatic noise reduction using negative output resistance
09/18/2003WO2003077594A1 Howling control device and howling control method
09/18/2003WO2003076889A1 Method and system for measuring a system's transmission quality
09/18/2003WO2002049211A3 Dynamic allocation of power supplied by a power supply and frequency agile spectral filtering of signals
09/18/2003US20030174852 Directional microphone arrangement and method for signal processing in a directional microphone arrangement
09/18/2003CA2447144A1 Howling control device and howling control method
09/17/2003EP1004222A4 A distributed stereo system
09/17/2003CN2574325Y Alternate audio signal playback line
09/17/2003CN1443432A Directional microphone arrangement and method for signal processing in directional microphone arrangement
09/17/2003CN1443020A Signal excitation type electric microphone system
09/16/2003US6621910 Method and arrangement for improving leak tolerance of an earpiece in a radio device
09/12/2003WO2003075610A1 Acoustic signal transducing device and method
09/12/2003WO2003075606A1 Loudspeaker with shaped sound field
09/12/2003WO2003075603A2 Digital microphone
09/11/2003US20030169892 Microphone-speaker apparatus
09/11/2003US20030169890 Audio receiving system
09/11/2003US20030169189 Robust system for transmitting and receiving map data
09/10/2003EP1343352A1 Microphone-speaker apparatus
09/10/2003EP1343351A1 A method and an apparatus for enhancing received desired sound signals from a desired sound source and of suppressing undesired sound signals from undesired sound sources
09/10/2003EP1342316A1 Playback device for audio signals that are transmitted over potentially disturbed channels
09/10/2003CN2572702Y Sound controlled loudspeaker with lighting
09/10/2003CN1442003A Method and means for receiving digital transmission comprising plurality of digital audio signals and for simultaneous reproduction of these signals as analog audio programmes
09/09/2003US6618485 Microphone array
09/09/2003US6618481 Method for improving acoustic sidetone suppression in hands-free telephones
09/09/2003US6617966 Compound acoustic actuator drive circuit and portable information terminal
09/04/2003WO2003073786A1 Multiple beam microphone array having automatic mixing processing via speech detection
09/04/2003WO2003025508A3 Station identification for a local area augmentation system on a visual display
09/04/2003WO2002074008A3 Improvements in noise cancellation
09/04/2003WO2002021879A3 Digital system to compensate power compression of loudspeakers
09/03/2003EP1341394A1 Electronic audio signal processing device
09/03/2003EP1341302A2 Btl amplifying system
09/03/2003EP1340224A1 Method for control of a unit comprising an acoustic output device
09/03/2003EP1133899A4 Binaural signal processing techniques
09/03/2003CN1440628A Interference suppression technologies
09/02/2003US6614911 Microphone assembly having a windscreen of high acoustic resistivity and/or hydrophobic material
08/2003
08/28/2003WO2003071829A1 Rapidly optimized wireless microphone system and method for controlling thereof
08/28/2003WO2003071827A2 Compact surround-sound system
08/28/2003WO2003034780A3 Signal processing device for acoustic transducer array
08/28/2003WO2003026174A3 Digital audio system
08/28/2003US20030163303 Memory sharing scheme in audio post-processing
08/28/2003US20030161488 Audio circuit having noise cancelling function
08/28/2003US20030161485 Multiple beam automatic mixing microphone array processing via speech detection
08/28/2003US20030161484 Built-in microphone device
08/28/2003US20030160653 BTL amplifying system
08/27/2003EP1337184A1 Miniature ultrasound transducer
08/27/2003EP1044584A4 Mechanical acoustic crossover network and transducer therefor
08/27/2003CN1438819A Method and apparatus for eliminating touch noise of microphone
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