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)
06/2000
06/06/2000US6072921 Method of operating a fiber-optic acoustical sensor, apparatus for practicing the method, and in-line fiber-optic polarizer usable in such apparatus
04/2000
04/26/2000EP0995337A1 Electrolytic loudspeaker assembly
04/25/2000US6055080 Optical microphone
04/12/2000EP0992977A2 Acoustic vibration generator
04/11/2000US6049511 High sensitivity fiber optic hydrophone
04/06/2000WO2000019771A1 Microphone having linear optical transducers
03/2000
03/30/2000WO2000018031A1 Method and device for developing a virtual speaker distant from the sound source
03/30/2000WO2000001195A9 Electrostatic speaker with foam stator
03/30/2000CA2345336A1 Method and device for developing a virtual speaker distant from the sound source
03/29/2000CN2371619Y Examination instrument for driving vehicle
03/23/2000WO1999052323A8 Folded sagnac sensor array
03/21/2000US6041020 Gas-coupled laser acoustic detection
03/08/2000CN1050247C Vibrator, resonator and resonance component utilizing width expansion vibration type
03/07/2000US6034924 Folded sagnac sensor array
03/02/2000WO2000011910A1 Harmonic amplifier and corresponding electroacoustic transducer
02/2000
02/23/2000EP0980639A1 Sound transducer and method having light detector for detecting displacement of transducer diaphragm
02/17/2000WO2000008894A1 Infrared helmet
02/17/2000DE19835947A1 Optical microphone has a mirror surface only partially over the membrane to reduce the membrane mass for increased sensitivity and pliability without loss of recording quality
02/08/2000US6023123 Acoustic vibration generator
01/2000
01/12/2000EP0880788A4 Optical transceiver
01/11/2000US6014239 Optical microphone
01/06/2000WO2000001195A2 Electrostatic speaker with foam stator
12/1999
12/30/1999DE19809920C1 Optischer, insbesondere optoakustischer Sensor sowie optisches Mikrofon Optical, in particular opto-acoustic sensor and optical microphone
12/29/1999EP0966864A1 Combination seal and wear ring for an air gun
12/21/1999US6004209 Body-acoustic device, playing apparatus and its control method, light-beam utilizing playing apparatus, and acoustic apparatus
12/14/1999US6002649 Tapered cylinder electro-acoustic transducer with reversed tapered driver
12/14/1999US6002646 Portable optical range tracking array
12/09/1999WO1999063787A1 Device for reproducing sounds
12/09/1999DE19824156A1 Vorrichtung zur Wiedergabe von Klängen An apparatus for reproducing sounds
12/07/1999US5999491 Low frequency underwater sound source
11/1999
11/30/1999US5995260 Sound transducer and method having light detector for detecting displacement of transducer diaphragm
11/23/1999US5991423 Planar magnetic continuous-tone transducer
10/1999
10/19/1999US5969838 System for attenuation of noise
10/14/1999WO1999052323A1 Folded sagnac sensor array
09/1999
09/28/1999US5959217 Fluid flow measuring device as a microphone and system comprising such a microphone
09/22/1999CN1229542A Acoustic heterodyne device and method
08/1999
08/19/1999WO1999041942A1 Acoustic membrane oscillator
08/05/1999WO1999029139A3 Optical acoustic sensor, especially a microphone, with an addtional reflection device
08/03/1999CA2050843C Noise eliminating element and electrical circuit having the same
07/1999
07/15/1999WO1999035881A1 Loudspeaker device and method for driving the same, and audio signal transmitter/receiver
06/1999
06/30/1999CA2257058A1 Suppression of polarization hole burning with an acousto-optic modulator
06/17/1999DE19839289A1 Electroacoustic converter e.g. for ultrasound transmitter especially for medical applications and diagnosis
06/17/1999DE19826565A1 Optischer Schallsensor, insbesondere Mikrofon Optical sound sensor, in particular microphone
06/10/1999WO1999029139A2 Optical acoustic sensor, especially a microphone, with an addtional reflection device
06/08/1999US5910855 For the modulation of a light beam
04/1999
04/29/1999WO1999021399A1 Combination seal and wear ring for an air gun
04/29/1999CA2272303A1 Combination seal and wear ring for an air gun
04/14/1999EP0908019A1 Acoustic heterodyne device and method
03/1999
03/30/1999US5889870 Acoustic heterodyne device and method
03/30/1999US5889278 Optical communication device
03/24/1999EP0903960A1 Antenna formed by a plurality of acoustic detectors
03/02/1999US5877493 Optical sensing apparatus
02/1999
02/09/1999US5869892 Noise eliminating element and electrical circuit having the same
02/03/1999CN1041987C Electroacoustic energy transmission conversion method and full spectrum electroacoustic energy transducer
01/1999
01/21/1999WO1999003146A1 Vibrational transducer and method for its manufacture
12/1998
12/17/1998WO1998057522A1 Electrolytic loudspeaker assembly
12/10/1998WO1998035529A3 Elastomeric dielectric polymer film sonic actuator
12/02/1998EP0880788A1 Optical transceiver
12/02/1998EP0880502A1 Aminoheterocyclic derivatives as antithrombotic or anticoagulant agents
12/02/1998EP0813802B1 Passive acousto-optic modulator
11/1998
11/12/1998WO1998051123A1 Sound transducer and method having light detector for detecting displacement of transducer diaphragm
10/1998
10/20/1998US5825901 Rotary low-frequency sound reproducing apparatus and method
10/20/1998US5825720 Combination seal and wear for an air gun
10/14/1998EP0766904B1 Use of a fluid flow measuring device as a microphone and system comprising such a microphone
09/1998
09/16/1998EP0864107A1 Low frequency underwater sound source
09/01/1998US5802189 For producing sound in response to an audio signal
08/1998
08/13/1998WO1998035529A2 Elastomeric dielectric polymer film sonic actuator
06/1998
06/23/1998US5771091 Sensor and a method for measuring distances to, and/or physical properties of, a medium
06/10/1998CN1184554A Optical transceiver
05/1998
05/07/1998DE19646764A1 Electro-acoustic transducer generating short acoustic pulses for industrial measurement engineering acoustic sensors
05/05/1998US5748758 Acoustic audio transducer with aerogel diaphragm
04/1998
04/30/1998DE19549527A1 Sound signal reception method especially for short sound pulses
04/22/1998CN1179831A Compact sleeve air gun
04/21/1998US5742561 Transversely driven piston transducer
04/02/1998WO1998014033A1 Method for automatic control of a transducer with variable reluctance, and linear motor for implementing same
03/1998
03/24/1998US5732046 Active fiber-optic opto-acoustic detector
03/10/1998US5726396 Folded acoustical horn
02/1998
02/25/1998EP0824844A1 Acoustic vibration generator
02/24/1998US5721379 For generating ultrasound waves in an electrically conducting sample
02/12/1998WO1998006234A1 Electrohydraulic pressure wave projectors
02/10/1998US5717774 Photothermal acoustic device
01/1998
01/22/1998WO1998002978A1 Acoustic heterodyne device and method
01/22/1998WO1998002977A1 Acoustic mixing device and method
12/1997
12/29/1997EP0813802A1 Passive acousto-optic modulator
12/02/1997US5694477 Photothermal acoustic device
11/1997
11/20/1997WO1997043870A1 System and method for registration and reproduction of sensory fields
11/12/1997CN2267594Y Easily repaired and long service life type ear phone
10/1997
10/30/1997WO1997040643A1 Active fiber-optic opto-acoustic detector
09/1997
09/10/1997EP0794414A2 Fiber optic hydrophone having rigid mandrel
08/1997
08/07/1997WO1997028129A1 Aminoheterocyclic derivatives as antithrombotic or anticoagulant agents
07/1997
07/10/1997DE19623504C1 Optical microphone using Fabry-Perot interferometer and fibre=optics feed line
07/08/1997US5646910 Pneumatic gun for rapid repetitive firing
07/08/1997US5646909 Pneumatic gun for rapid repetitive acoustic firing
07/08/1997US5646396 Optical position system
07/03/1997DE19548882A1 Apparatus for generating or receiving very short sound pulses
06/1997
06/12/1997WO1997021321A1 Photothermal acoustic device
06/05/1997WO1997020233A1 Low frequency underwater sound source
06/04/1997EP0777404A1 System for attenuation of noise
06/04/1997CN1151241A Use of a fluid flow measuring device as a microphone and system comprising such a microphone
05/1997
05/28/1997EP0775433A1 Electromagnetic acoustic transducers
1 ... 3 4 5 6 7 8 9 10 11 12 13 14 15 16