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Matches 251 - 300 out of 2,000

Document Document Title
WO/2000/059264A2
There is provided an optical microphone system whose power consumption can be reduced and which can be driven in multiplex at high speed. In an optical microphone system comprising an optical microphone (100) having a vibrating plate (10...  
WO/2000/055806A1
The invention relates to a surface acoustic wave converter also referred to as TAG and to an identification system using the same. The surface acoustic wave converter consists of a combination of a first transmission device of the disper...  
WO/2000/047012A2
The aim of the invention is to produce a sound generator for eliminating interference by means of sound absorption and for reproducing signals, speech and music. The sound is preferably generated by means of micro- and nanomechanical air...  
WO/2000/044199A1
A compound electrolytic loudspeaker (10) comprising two major elements: a capacitive transducer (12) and a transducer driver unit (116). The capacitive transducer (12) consist of a compound diaphragm (14) that is suspended within a frame...  
WO/2000/019771A1
The present invention includes the use of linear optical transducers in several configurations to detect the motion of one or more conventional microphone diaphragms in proportional response to incident acoustic signals. A light source (...  
WO/2000/018031A1
A method for providing multiple speaker locations around a listener (53) in a room with a sound source at a single location. The method comprising the steps of a) generating primary audio output by emitting audio compression waves from a...  
WO2000001195A9
An electrostatic speaker device, comprising a first foam stator having an interior surface, and a second foam stator having an interior surface positioned adjacent to the interior surface of the first stator. The interior surfaces of the...  
WO1999052323A8
A folded Sagnac fiber optic acoustic sensor array (700) operates in a manner similar to a Sagnac interferometer but uses a common delay path to reduce distributed pickup in downlead fibers. The fiber optic acoustic sensor array is used t...  
WO/2000/011910A1
In the field of sound reproduction it is customary to use diaphragms excited by magnetic motors or tape electrostatic systems. All these products have important volumes being actuated to produce sound. Inversely, sound is an impact betwe...  
WO/2000/008894A1
The invention relates to an infrared helmet having the shape of a receiver associated to a strap to be placed around the chin. Said helmet is designed to receive infrared signals and to convert said signals into acoustic signals which ar...  
WO/2000/001195A2
An electrostatic speaker device, comprising a first foam stator having an interior surface, and a second foam stator having an interior surface positioned adjacent to the interior surface of the first stator. The interior surfaces of the...  
WO/1999/063787A1
The invention relates to a device for rendering high-quality sounds in equipment with limited space, for example notebooks. Said device consists of two very small loudspeakers (L1, L2) working in frequency ranges (f1, f2) which are each ...  
WO/1999/052323A1
A folded Sagnac fiber optic acoustic sensor array (700) operates in a manner similar to a Sagnac interferometer but uses a common delay path to reduce distributed pickup in downlead fibers. The fiber optic acoustic sensor array is used t...  
WO/1999/041942A1
In the field of sound reproduction the movements of membranes have too high amplitude levels relative to the deformations of low amplitude levels propagated on the surfaces of materials of the objects which have emitted the original soun...  
WO1999029139A3
The invention relates to an optical acoustic sensor, especially a microphone. According to the invention, a light beam is guided diagonally over a reflecting surface (3a) of a deflecting body or a membrane (3), by means of optical wavegu...  
WO/1999/035881A1
An audio signal outputted from a sound source is modulated into a signal with a frequency in a frequency band higher than the audio frequency band by a modulator. An ultrasonic wave generating device is driven by the signal whose frequen...  
WO/1999/029139A2
The invention relates to an optical acoustic sensor, especially a microphone. According to the invention, a light beam is guided diagonally over a reflecting surface (3a) of a deflecting body or a membrane (3), by means of optical wavegu...  
WO/1999/021399A1
A wear ring assembly (22) for an air gun includes a support ring (128) having a receiving recess (130) of a first length formed in a surface of an end of the support ring (128). An elastic ring (124) is adjacent an end of the receiving r...  
WO/1999/003146A1
A vibratory transducer comprises a housing, a vibrating member (112) disposed within the housing (108), and an inertial mass (100) attached to a free end of the vibratory member (112). The other end of the vibratory member is anchored to...  
WO/1998/057522A1
A compilation of improvements and modifications to U.S. patent 5,392,358 which discloses an electrolytic loudspeaker assembly (10) which reproduces a broad band of audio signals. The assembly (10) is comprised of a thin, non-magnetic cap...  
WO1998035529A3  
WO/1998/051123A1
Transducer circuitry, and an associated method, converts acoustic signals into electrical signals. The transducer circuitry includes a diaphragm which is positioned to receive acoustic signals, such as voice signals. Displacement of the ...  
WO/1998/035529A2
A sonic actuator including a multi-layer membrane having an elastomeric dielectric polymer layer with a first surface and a second surface, a first compliant electrode layer contacting the first surface of the polymer layer, and a second...  
WO/1998/014033A1
The invention concerns methods and devices for automatic control of transducers with variable reluctance. It consists in determining (201) in non- linear manner independent of the mechanical load of the transducer the field required for ...  
WO/1998/006234A1
A projector (10) for creating electrohydraulic acoustic and pressure waves conprising an energy source (21) (such as a capacitor) within approximately one meter of an electrode array (23). Larger projectors may be formed by arraying the ...  
WO/1998/002977A1
The present invention is the emission of new sonic or subsonic compression waves from a region of interference of at least two ultrasonic wave trains (30, 32). In one embodiment, two ultrasonic emitters (20) are oriented so as to cause i...  
WO/1998/002978A1
The present invention is the emission of new sonic or subsonic compression waves from a resonant cavity (80) as a result of interference of at least two ultrasonic wave trains (30, 32). In one embodiment, two ultrasonic emitters (20) are...  
WO/1997/043870A1
A system and method for registration and reproduction of sensory fields is provided whereby single or multiple sounds or images can be created or registered. The system and method utilize combinations of self-demodulation, scattering and...  
WO/1997/040643A1
An opto-acoustic detector (10) includes a fiber laser (17) having a cavity which includes an optical fiber (11) having an active medium portion (13) doped with a gain material so that the detector may be used in high frequency, high dens...  
WO/1997/028129A1
Compounds of formula (I), wherein G1 is CH or N; G2 is CH or N; R1 is a variety of optional substituents; L1 is (1-4C)alkylene; T1 is CH or N; R2 and R3 are independently hydrogen or (1-4C)alkyl or are joined to form a ring; X1 and X2 re...  
WO/1997/021321A1
A photothermal apparatus is provided for controllably heating and cooling a gas in order to alter and thereby control the acoustic, mechanical or optical properties of the gas. For acoustic applications, the photothermal device may be us...  
WO/1997/020233A1
An acoustic generating system is described incorporating a bubble generator (1) for forming pressurised gas bubbles and directing the bubbles in a plume from an outlet (7), and a low frequency sound source (2) to apply a varying pressure...  
WO/1996/036983A1
An apparatus and method are provided for determining the position of a reflective target surface (60) using one or more laser cavities (40, 41). A transmitting laser cavity (40) produces a stable-resonator output beam (42) which is modul...  
WO/1996/035313A1
The invention relates to an arrangement for generating sound waves or anti-sound waves. For the sound wave transducer, use can be made of window glass (1) or other types of transparent material, which is set into vibration by means of on...  
WO/1996/028001A1
A passive acousto-optic modulator for the modulation of a light beam as a function of a variation in air pressure comprising a beam splitter arranged relative to the beam so as to produce a signal beam and reference beam, the beam splitt...  
WO/1996/000488A1
Use of a fluid flow measuring device as a microphone for detecting acoustic waves, said fluid flow measuring device comprising at least one heating element (H), at least a first temperature sensor (S1) arranged at a first predetermined s...  
WO/1995/033355A1
A sound feeling device (1) having a case main body (4) which is constituted of, at least, a case (3) having a bottom (3x) in contact with the body when the device (1) is used and a partition plate (5) which is mounted with a loudspeaker ...  
WO/1995/031083A1
An acoustic sensor for use in a typical atmospheric condition, which contains both winds and turbulence, such as a wind and turbulence encountered on the exterior surface of a moving airborne flight vehicle includes a probe housing (10) ...  
WO/1995/014363A1
An electromagnetic acoustic transducer (1) for generating ultrasound waves in an electrically conducting sample (2) comprises magnetic means (7) for producing a static magnetic field, and a coil (5) through which brief current pulses are...  
WO/1994/019914A1
Apparatus (21) is described for reproducing low frequency sound in response to an applied electrical signal having a rotary acoustic radiator (22) comprised of a chamber (26) having a rotor assembly (58) including a shaft (61) and movabl...  
WO/1994/001979A1
A hydraulic powered low-damped loudspeaker including a hydraulic cylinder (21) attached to the cone (22) of a speaker which can be used in a bandpass loudspeaker.  
WO/1993/024813A1
There is described an optical acoustic sensor (110) that is pressure-compensated for operation in high-pressure environments such as the deep sea and that may be employed in multi-sensor arrays. The sensor (110) includes an acoustically ...  
WO/1993/023178A1
A low frequency sonar projector (100) for use with a projector array having at least one ceramic stack (102) comprised of lead magnesium niobate-lead titanate (PMN-PT) having a Curie temperature Tm approximately equal to the operating te...  
WO/1993/018628A1
Transducer comprising a wall (1) delimiting a cavity (3), an output channel (5) crossing the wall (1) and opening into the cavity (3), a light-transmitting member (6) extending through the wall and opening into the cavity (3), the output...  
WO/1993/014609A1
The sensor is comprised of a casing (1) supporting a light input member (9) and a light output member (14) arranged facing each other and defining a light beam (12), and a membrane (6) arranged adjacent to the light beam (12) and present...  
WO/1992/005458A1
A method of making modular micro-optical systems of great flexibility and adaptability. A substrate (22) is formed with a relief pattern (23), optical components such as optical fibers (24) are added, another relief pattern (25) is forme...  
WO/1990/015513A1
A multi-driver, coaxially mounted loudspeaker array (10) utilizing a high frequency bi-morph driving element (36) that is totally contained within the voice coil (18) former (16) (air core) of a lower frequency loudspeaker. The outwardly...  
WO/1990/012296A1
A semiconductor transducer (30, 80) or actuator (101) is disclosed. The transducer and actuator each include a defecting member (38, 83, 108) with corrugations (34, 88, 110) producing increased vertical travel which is a linear function ...  
WO/1990/007250A1
The microphone, by means of which acoustic signals whose spectrum is above 20Hz, may be measured, comprises a reference space exempt from this signal. It further comprises a monomode light source (10) and an optical interferometer with a...  
WO/1989/012375A1
An optical microphone is described that is composed of the body of the microphone proper, of a proof laser (7), of a thin film (1), and of a detector (11) sensitive to position. The pressure waves due for instance to the absorption by a ...  

Matches 251 - 300 out of 2,000