Patents
Sitemap › H04 - Electric communication technique › H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems › H04R 23 - Transducers other than those covered by groups
Patents for H04R 23 - Transducers other than those covered by groups (1,562)
12/2003
12/16/2003CA2214462C Passive acousto-optic modulator
12/10/2003EP1163632B1 Surface acoustic wave converter and identification system using the same
12/04/2003WO2002082858A3 Sound and vision system
12/03/2003EP1367855A1 Vibration detector
11/2003
11/20/2003WO2003096223A1 Mutant sequence analyzer
11/20/2003WO2003014774A3 Amplified tree structure technology for fiber optic sensor arrays
11/20/2003US20030215103 Parametric virtual speaker and surround-sound system
11/20/2003US20030214199 Electroactive polymer devices for controlling fluid flow
11/13/2003US20030209656 Optical transducers and method of making same
11/12/2003EP0715801B1 Airborne sensor for listening to acoustic signals
11/11/2003US6647537 IEEE 1394 cable connector with short circuit switch
11/06/2003WO2003092321A1 Sound focus speaker of gas-filled sound lens attachment type
11/06/2003US20030207882 Aminoheterocyclic derivatives as antithrombotic or anticoagulant agents
10/2003
10/30/2003WO2003047306A3 Radial power megasonic transducer
10/23/2003WO2002080616A3 Optical microphone for communication devices
10/22/2003CN1125576C Very thin loudspeaker and its manufacture method
10/14/2003CA2261108C Acoustic heterodyne device and method
10/09/2003WO2003084285A1 Sound-to-vibration conversion apparatus
10/09/2003WO2002104067A3 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology
10/02/2003WO2003081762A1 Electroactive polymer devices for moving fluid
09/2003
09/25/2003US20030179384 Membrane type optical transducers particularly useful as optical microphones
09/18/2003US20030173507 Optical transducers of high sensitivity
09/18/2003US20030173506 Optical transducers and methods of making same
09/11/2003US20030168946 Radial power megasonic transducer
09/09/2003US6618124 Optical microphone/sensor
08/2003
08/28/2003WO2003014674A3 Two delay coil sagnac-based sensor array
08/12/2003US6604363 Matching an acoustic driver to an acoustic load in an acoustic resonant system
08/06/2003EP1333245A1 Fine displacement detection device by sound or the like
08/05/2003US6603105 Smart optical microphone/sensor
07/2003
07/30/2003EP1330867A1 Actuating member and method for producing the same
07/30/2003CN1433663A 光学声电换能器 Optical acoustic-electric transducer
07/30/2003CN1433661A Piezoelectric film sonic emitter
07/16/2003EP1327376A2 Optical heads for optical microphone/sensors
07/15/2003US6594198 Digital signal demodulator calibration system and method for optical hydrophones
07/10/2003WO2003056545A1 Electropneumatic horn
07/10/2003US20030128958 Optical microphone for communication and other devices
07/02/2003CN1113493C Electronic circuits having noise eliminating element
06/2003
06/24/2003US6583533 Electroactive polymer electrodes
06/18/2003CN1425264A Bone conduction transducer and bone conduction speaker headset therewith
06/12/2003WO2003049494A1 Optical microphone
06/12/2003WO2003049491A2 High frequency thermoacoustic energy converter
06/10/2003US6578165 Internal guardband for semiconductor testing
06/10/2003US6577738 Parametric virtual speaker and surround-sound system
06/05/2003WO2003047306A2 Radial power megasonic transducer
06/05/2003WO2003046498A1 Optical displacement sensor
05/2003
05/22/2003WO2003043377A1 Optical displacement sensor element
05/22/2003WO2003043376A1 Diaphragm structure of light-sound converter
05/13/2003US6562650 Microfabricated transducers formed over other circuit components on an integrated circuit chip and methods for making the same
05/02/2003EP0720810B1 Rotary low-frequency sound reproducing apparatus and method
05/01/2003WO2002087279A3 Matching an acoustic driver to an acoustic load in an acoustic resonant system
04/2003
04/30/2003CN2548382Y Terminal assembling mechanism of earphone microphone
04/24/2003WO2003034778A2 Electroacoustic device and method of quality control
04/15/2003US6549631 Pressure transducing assembly
04/10/2003US20030067841 Digital signal demodulator calibration system and method for optical hydrophones
04/08/2003US6545384 Electroactive polymer devices
04/08/2003US6543110 Electroactive polymer fabrication
04/02/2003EP1297721A2 Gas flow sensor, speaker system and microphone
04/01/2003US6542244 Variable sensitivity acoustic transducer
03/2003
03/19/2003EP1084590A4 Folded sagnac sensor array
03/13/2003US20030048913 Bone-conduction transducer and bone-conduction speaker headset therewith
03/13/2003US20030048698 Bias control of electrostatic transducers
03/12/2003CN1402955A Acoustoelectric transducer using optical device
03/04/2003US6529444 Folded sagnac sensor array
02/2003
02/27/2003US20030039368 Optical microphone noise suppression system
02/20/2003WO2003014774A2 Amplified tree structure technology for fiber optic sensor arrays
02/20/2003WO2003014674A2 Two delay coil sagnac-based sensor array
02/20/2003US20030035343 Optical microphone/sensor
02/13/2003US20030032211 Microfabricated transducers formed over other circuit components on an integrated circuit chip and methods for making the same
02/13/2003DE10138434C1 Fokussierender elektroakustischer Wandler und Verfahren zum Test seiner Ausgangsleistung The focusing electroacoustic transducer and method for testing of its output
02/12/2003EP1283517A2 Focussed electro-acoustic transducer and method for testing its output power
02/06/2003US20030026435 Focussing electroacoustic transducer and method for testing its output power
01/2003
01/23/2003US20030016838 Optical microphone systems and method of operating same
01/15/2003EP1275268A1 Bone-conduction transducer and bone-conduction speaker headset therewith
01/09/2003US20030008625 Microphone arrangement for mobile telephones
01/09/2003US20030007890 Light reflecting surfaces
01/09/2003US20030007656 Device for detecting pressure fluctuations, display device, recording device and sound reproduction system
01/09/2003US20030006184 Low frequency acoustic converter
01/03/2003WO2002034009A3 Optical heads for optical microphone/sensors
01/03/2003WO2001087009A3 Gas flow sensor, speaker system and microphone
01/02/2003US20030002129 Optical acoustoelectric transducer
12/2002
12/27/2002WO2002104069A1 Diaphragm structure of light sound converter
12/27/2002WO2002104067A2 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology
12/27/2002WO2002103294A1 Sensor using electro active curved helix or double helix
12/24/2002US6498853 Echo-cancelling optical microphone
12/19/2002US20020191802 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology
12/11/2002EP1265456A2 Low frequency acoustic converter
12/10/2002US6493451 Communication helmet
12/05/2002US20020181049 Optical heads for optical microphone/sensors
12/05/2002US20020178831 Force sensing device
12/05/2002US20020178736 Matching an acoustic driver to an acoustic load in an acoustic resonant system
12/03/2002US6489707 Method and apparatus for generating acoustic energy
11/2002
11/28/2002WO2002095342A1 Device for detecting pressure fluctuations, display device, recording device and sound reproduction system
11/27/2002EP1260116A1 Folded sagnac sensor array
11/21/2002WO2002093773A1 Parametric virtual speaker and surround-sound system
11/21/2002US20020171822 Thin optical microphone/sensor
11/21/2002US20020171636 Sound and vision system
11/21/2002CA2446645A1 Parametric virtual speaker and surround-sound system
11/20/2002EP1258714A2 Optical converting type ultrasonic receiving apparatus
11/19/2002US6483619 Optical-interference microphone
11/14/2002US20020166955 Optical converting type ultrasonic receiving apparatus
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