H04R 23 - Transducers other than those covered by groups

Patents for H04R 23 - Transducers other than those covered by groups (1,562)
01/2005
01/27/2005	US20050018859 Optically driven audio system
01/27/2005	US20050018541 Optical displacement sensor element
01/26/2005	CN1571582A Mini-acoustical device based on magneto resistor effect
01/20/2005	US20050013455 MEMS digital-to-acoustic transducer with error cancellation
01/06/2005	US20050001510 Uniform energy megasonic transducer using vessel as resonator
01/05/2005	CN1183801C Bone conduction transducer and bone conduction speaker headset therewith
01/05/2005	CN1183691C Acoustic heterodyne device and method
12/2004
12/30/2004	US20040263028 Electroactive polymers
12/23/2004	US20040258258 Fluidic acoustic transducer
12/16/2004	US20040252930 Sensor or a microphone having such a sensor
12/14/2004	US6831266 Optical transducers of high sensitivity
12/09/2004	US20040247140 Parametric virtual speaker and surround-sound system
12/09/2004	US20040246110 Electropneumatic horn
12/07/2004	US6829131 MEMS digital-to-acoustic transducer with error cancellation
12/02/2004	US20040238267 Diaphragm structure of light sound converter
12/02/2004	US20040237676 Sensor using electro active curved helix and double helix
11/2004
11/25/2004	WO2003034778A3 Electroacoustic device and method of quality control
11/25/2004	US20040232807 Electroactive polymer transducers and actuators
11/23/2004	US6822373 Broadband triple resonant transducer
11/10/2004	CN1545612A Sensor using electro active curved helix and double helix
11/03/2004	CN2653831Y Novel belt type high frequency speaker
11/02/2004	US6812624 Electroactive polymers
10/2004
10/28/2004	DE10314731A1 Sensor bzw. Mikrofon mit einem solchen Sensor Sensor and microphone with such a sensor
10/27/2004	CN2652077Y Vibrating loudspeaker
10/21/2004	DE10315139A1 Optical sensor for detecting loudspeaker membrane deflections e.g. for controlled -operation loudspeakers, has optical sensor and opposite-facing light source mounted with oscillation coil between them for partial covering of optical sensor
10/19/2004	US6807281 Loudspeaker and method of driving the same as well as audio signal transmitting/receiving apparatus
10/12/2004	US6804371 Speaker having a laser vibration diaphragm
10/05/2004	CA2238972C Low frequency underwater sound source
09/2004
09/22/2004	EP1459293A1 Electropneumatic horn
09/21/2004	US6795374 Bias control of electrostatic transducers
09/15/2004	EP1221180A4 Electroactive polymers
09/15/2004	EP1212800A4 Improved electroactive polymers
09/14/2004	US6791519 Sound and vision system
09/14/2004	US6791242 Uniform acoustic energy cleaning of rotating objects
09/10/2004	WO2004077881A1 Thermally excited sound wave generating device
09/09/2004	US20040174076 Moving coil linear motor positioning stage with a concentric aperture
09/08/2004	CN2640177Y Self-mixing interference microphone with semiconductor laser
09/07/2004	US6788204 Surface-wave transducer device and identification system with such device
09/01/2004	EP1451547A1 Optical displacement sensor
09/01/2004	EP0880502B1 Aminoheterocyclic derivatives as antithrombotic or anticoagulant agents
09/01/2004	CN1525792A Non-microphone voice transmission device
09/01/2004	CN1165198C IEEE 1394 cable connector with short circuit switch
08/2004
08/25/2004	EP1449268A2 Radial power megasonic transducer
08/25/2004	CN1164147C Electromagnetic microphone
08/24/2004	US6781284 Electroactive polymer transducers and actuators
08/18/2004	EP1446979A1 Optical displacement sensor element
08/18/2004	CN2634771Y Speaker with telephone receiver function
08/11/2004	EP1445981A1 DIAPHRAGM STRUCTURE OF LIGHT−SOUND CONVERTER
08/10/2004	US6772962 Low frequency acoustic converter
08/04/2004	CN1160999C Sound transducer and method having light detector for detecting displacement of transducer diaphragm
07/2004
07/22/2004	US20040141420 System and method for monitoring performance of downhole equipment using fiber optic based sensors
07/08/2004	US20040131222 Universal ribbon element-module for two or more membrane-widths with optimized flow and drive
07/07/2004	EP1435190A2 Magnetostrictive actuator
07/06/2004	US6760454 Passive voice-activated microphone and transceiver system
06/2004
06/30/2004	EP1391136A4 Matching an acoustic driver to an acoustic load in an acoustic resonant system
06/30/2004	CN1509120A Time-limit-use earphone
06/23/2004	CN1507701A Parametric virtual speaker and surround-sound system
06/02/2004	EP1423987A2 Amplified tree structure technology for fiber optic sensor arrays
06/02/2004	EP1423986A2 Apparauts and method for processing optical signals from two delay coils to increase the dynamic range of a sagnac-based fiber optic sensor array
05/2004
05/27/2004	US20040099799 Fine displacement detection device by sound or the like
05/25/2004	US6740862 Optical transducers and methods of making same
05/19/2004	CN1498514A System and methods for sensing acoustic signal using micro-electronical system technology
05/13/2004	WO2003049494A9 Optical microphone
05/13/2004	US20040092808 Ultrasonic receiving apparatus and ultrasonic receiving method
05/13/2004	US20040091125 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology
05/13/2004	US20040090686 Displacement/quantity of light converter
05/11/2004	US6735306 Infrared helmet
04/2004
04/28/2004	CN1493169A Sound and vision system
04/21/2004	EP1411463A2 Surface acoustic wave converter and identification system using the same
04/20/2004	US6722206 Force sensing MEMS device for sensing an oscillating force
04/15/2004	US20040069939 Phantom power optical microphone system
04/13/2004	US6721429 Electro-magnetic microphone
04/08/2004	US20040067005 Vibration detector
04/07/2004	CN1488232A Structuro of diaphragm for optoacoustic transducer
04/01/2004	US20040062406 Diaphragm structure of light-sound converter
04/01/2004	US20040062404 Speaker system
03/2004
03/31/2004	EP1404150A1 Diaphragm structure of light sound converter
03/24/2004	EP1400149A2 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology
03/18/2004	WO2002087278A3 Optical microphone construction
03/18/2004	WO2002076142A3 Phanton power optical microphone system
03/18/2004	US20040051420 Electromechanical transducer and method for manufacturing an electromechanical transducer
03/11/2004	US20040047478 Coaxial speaker with step-down ledge to eliminate sound wave distortions and time delay
03/10/2004	EP1395798A1 Device for detecting pressure fluctuations, display device, recording device and sound reproduction system
02/2004
02/26/2004	WO2003049491A3 High frequency thermoacoustic energy converter
02/25/2004	EP1391136A2 Matching an acoustic driver to an acoustic load in an acoustic resonant system
02/19/2004	WO2002047434A3 Optical microphone system and a method for forming same
02/19/2004	US20040032966 Speaker having a laser vibration diaphragm
02/17/2004	US6694031 Optical microphone/sensors
02/10/2004	US6688169 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology
02/04/2004	EP1386519A2 Sound and vision system
02/04/2004	EP1386415A1 Parametric virtual speaker and surround-sound system
01/2004
01/22/2004	US20040012301 Actuating member and method for producing the same
01/15/2004	US20040008853 Electroactive polymer devices for moving fluid
01/15/2004	DE20316318U1 Anordnung zur Darbietung von Bild und Ton Arrangement for the performance of image and sound
12/2003
12/31/2003	WO2004001943A1 Tactile device
12/24/2003	CN1463357A Device for detecting pressure fluctuations, display device, recording device and sound reprodn. system
12/23/2003	US6668065 Bone-conduction transducer and bone-conduction speaker headset therewith
12/18/2003	WO2002076141A3 Magnetostrictive actuator
12/17/2003	EP1371956A1 Displacement/quantity of light converter
12/16/2003	US6664718 Monolithic electroactive polymers

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