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)
05/2006
05/04/2006DE102004052767A1 Optical microphone, has membrane with protuberance arranged between transmitter and receiver, which are arranged below membrane in such a way that axis of optical path of rays between transmitter and receiver is parallel to membrane axis
05/03/2006CN1254665C Device for detecting pressure fluctuations
05/02/2006US7038576 Electropneumatic horn
04/2006
04/27/2006DE102004051697A1 Optical microphone, has optical transmitter and optical receiver arranged opposite each other, parallel to surface of diaphragm
04/26/2006EP1451547B1 Optical displacement sensor
04/25/2006US7034432 Electroactive polymer generators
04/19/2006EP1648196A2 Devices and transducers with cavity resonator to control 3-D characteristics/harmonic frequencies for all sound/sonic waves
04/18/2006US7028543 System and method for monitoring performance of downhole equipment using fiber optic based sensors
04/12/2006EP1121768A4 Method and device for developing a virtual speaker distant from the sound source
03/2006
03/28/2006US7019955 MEMS digital-to-acoustic transducer with error cancellation
03/23/2006WO2006011650A3 Acoustic wave sensor
03/01/2006CN2760949Y Intelligent irrigation controller
02/2006
02/02/2006CA2574028A1 Acoustic wave sensor
01/2006
01/18/2006CN1237732C System and method for generating virtual speaker by using parametric sound system
01/12/2006US20060006766 Wedge shaped uniform energy megasonic transducer
01/10/2006US6984819 Optical converting type ultrasonic receiving apparatus
01/04/2006CN1714770A Hearing system
01/03/2006CA2262581C Electrohydraulic pressure wave projectors
12/2005
12/29/2005WO2005125274A1 Acoustic wave amplifier
12/22/2005WO2005122637A1 Acoustic transducer comprising a plurality of coaxially arranged diaphragms
12/22/2005CA2567733A1 Acoustic transducer comprising a plurality of coaxially arranged diaphragms
12/15/2005WO2005120130A1 Electrostatic capacity type ultrasonic vibrator, manufacturing method thereof, and electrostatic capacity type ultrasonic probe
12/15/2005US20050276544 Optical digital audio system
12/13/2005US6975735 Sound collecting device minimizing electrical noise
11/2005
11/24/2005US20050259837 Sound collecting device minimizing electrical noise
11/23/2005EP1599068A1 Thermally excited sound wave generating device
11/16/2005CN1698400A Thermally excited sound wave generating device
11/10/2005WO2005107318A1 Pressure wave generator and method for fabricating the same
11/08/2005US6963650 Coaxial speaker with step-down ledge to eliminate sound wave distortions and time delay
11/03/2005WO2005104617A1 Acoustic element
11/02/2005CN1691341A Thin film circuit substrate, piezoelectric speaker device, display device, and sound-generating display device
10/2005
10/27/2005US20050239191 Tactile device
10/27/2005US20050238188 Optical microphone transducer with methods for changing and controlling frequency and harmonic content of the output signal
10/27/2005US20050237685 Thin film circuit substrate, piezoelectric speaker device, display device, and sound-generating display device
10/20/2005WO2005099307A2 Technique and device for through-the-wall audio surveillance
10/20/2005US20050232447 Microphone
10/13/2005US20050224282 Sound focus speaker of gas-filled sound lens attachment type
10/12/2005EP1585363A2 Improved audio frequency speaker
10/06/2005US20050220310 Technique and device for through-the-wall audio surveillance
09/2005
09/29/2005US20050213771 Propagating sound information to acoustically isolated environments
09/20/2005US6946774 Segmented uniform energy megasonic transducer
09/15/2005WO2005040727A3 Improvements in and relating to fibre optic sensors
09/15/2005US20050201663 Hydrophone mandrel for precise placement of gratings
09/15/2005US20050201584 Helmet with a magnetostrictive actuator
09/15/2005US20050201575 Thermally excited sound wave generating device
09/13/2005US6944306 Harmonic amplifier and corresponding electro-acoustic transducer
09/08/2005DE102004006226A1 Converting sound into electrical signals with temperature measurement involves using any measurement method for measuring temperature change with which changes of electrical characteristics are caused by temperature changes
09/06/2005US6940211 Electroactive polymers transducers and actuators
08/2005
08/31/2005CN1663104A Tactile device
08/25/2005US20050185809 Audio frequency speaker
08/18/2005DE202005006661U1 Laser supported contactless scanning of membrane defelected by acoustic pressure for microphone with wide acoustic frequency spectrum
08/17/2005EP1084590B1 Folded sagnac sensor array
08/03/2005CN1213635C Optical acoustoelectric transducer
08/02/2005US6924475 Optical transducers and method of making same
07/2005
07/28/2005US20050164198 Mutant sequence analyzer
07/28/2005US20050163509 Acoustoelectric transducer using optical device
07/27/2005EP1181837B1 Ieee 1394 cable connector with short circuit switch
07/14/2005US20050152222 Convex folded shell projector
07/13/2005EP1552722A2 Vibration detectors, sound detectors, hearing aids, cochlear implants and related methods
07/13/2005CN1638533A Sound heterodyne apparatus and method
07/12/2005US6916979 Electromechanical transducer and method for manufacturing an electromechanical transducer
06/2005
06/29/2005EP1546683A1 Photoacoustic detector
06/28/2005US6911764 Energy efficient electroactive polymers and electroactive polymer devices
06/16/2005WO2005036921A3 Parametric loudspeaker system for isolated listening
06/14/2005US6906807 Membrane type optical transducers particularly useful as optical microphones
06/09/2005DE10026474B4 Wandler mit halbleitender Membran Converter with semi-conducting membrane
06/08/2005CN2704174Y Micro acoustic device based on magneto resistance effect
06/08/2005CN1623368A Intelligent spray irrigation controlling device
06/03/2005CA2489840A1 Convex folded shell projector
05/2005
05/26/2005US20050111687 Noise attenuating headset
05/26/2005US20050111678 Electro-optical device and electronic apparatus
05/25/2005CN1203727C Acoustoelectric transducer using optical device
05/19/2005WO2005044140A2 Noise attenuating headset
05/19/2005US20050105098 Optical displacement sensor
05/19/2005US20050103706 Ionic liquid is selected from substituted or unsubstituted pyridinium compounds, pyridazinium compounds, pyrimidinium compounds, pyrazonium compounds, imadazolium compounds, pyrazolium compounds, thiazolium compounds, oxazolium compounds, and triazolium compounds;
05/10/2005US6891286 Magnetostrictive actuator
05/06/2005WO2005041590A1 Array for rendering image and sound
05/06/2005WO2005040727A2 Improvements in and relating to fibre optic sensors
04/2005
04/26/2005US6885116 Moving coil linear motor positioning stage with a concentric aperture
04/21/2005WO2005036921A2 Parametric loudspeaker system for isolated listening
04/20/2005CN1608283A Electropneumatic horn
04/19/2005US6882087 Uniform energy megasonic transducer using vessel as resonator
04/06/2005CN1603903A Electric light device and electronic apparatus
03/2005
03/30/2005EP1518315A1 Tactile device
03/24/2005US20050061770 MEMS digital-to-acoustic transducer with error cancellation
03/22/2005US6870937 Electroacoustic transducer, process of producing the same and electroacoustic transducing device using the same
03/15/2005US6868166 Chord-like vibration loudspeaker
03/09/2005EP1512215A1 Electroactive polymer devices for moving fluid
03/09/2005CN2684504Y An audio device
03/08/2005US6865335 Optical microphone for communication and other devices
03/02/2005EP1260116A4 Folded sagnac sensor array
02/2005
02/23/2005CN1190996C Electrolytic loudspeaker assembly
02/22/2005US6857312 Systems and methods for sensing an acoustic signal using microelectromechanical systems technology
02/17/2005US20050035689 Segmented uniform energy megasonic transducer
02/16/2005CN1190107C Piezoelectric film sonic emitter
02/10/2005US20050029878 Magnetostrictive actuator
02/09/2005EP1505517A1 Mutant sequence analyzer
02/09/2005CN2678297Y Voice transmission device without microphone
02/09/2005CN1579026A Radial power megasonic transducer
02/02/2005CN1187906C Method and device for producing a virtual speaker having a certain distance from sound source
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