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7536020 |
Wearable communication device
A wearable communication device includes a bone conduction actuator which is applicable for being in contact with a user's wrist, hand, back of the hand, finger or nail in order to transmit voice...
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7391873 |
Microphone with voltage pump
An integrated circuit ( 102 ) configured to provide a microphone output signal, comprising: a preamplifier ( 108 ) coupled to receive an input signal, generated by a first microphone member that is...
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7378776 |
Piezoelectric ceramic composition and piezoelectric elements using the same
A piezoelectric ceramic composition includes a top-layer, a bottom-layer and at least one intermediate-layer ceramic sheets stacked to each other for sintering. An alloy layer of silver and...
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7247976 |
Piezoelectric vibrator
A piezoelectric vibrator having excellent shock resistance and high reliability is offered. The centers of first and second piezoelectric vibrating plates are supported by pillars on a main surface...
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7216417 |
Method for manufacturing an electromechanical sensor element
Method for manufacturing an electromechanical sensor element for converting mechanical forces produced by the movements and vital functions or a person into electric signals, in which method a...
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7181181 |
Multi-band transceiver for a wireless communication system
A local oscillation signal generator and a multi-band transceiver including the local oscillation signal generator are provided. The multi-band transceiver includes a fractional-N phased locked...
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7130434 |
Microphone PCB with integrated filter
The present invention provides a solution to the needs described above through a microphone PCB with an integrated filter. The invention provides for an electret microphone assembly. The microphone...
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7092539 |
MEMS based acoustic array
Embodiments of the present invention described and shown in the specification and drawings include a combination responsive to an acoustic wave that can be utilized as a dynamic pressure sensor. In...
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7072478 |
Microphone preamplifier
A microphone preamplifier. An electrical signal from a microphone is received via a shielded cable by an input stage cascaded with an output stage. The input stage contains an impedance converter...
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7019439 |
High power ultrasonic transducer with broadband frequency characteristics at all overtones and harmonics
A transducer assembly for receiving a stimulating signal and producing ultrasound therefrom at one or more frequencies, over an ultrabroad bandwidth at each frequency, includes a front mass...
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6996891 |
Method for the manufacture of a sensor element
The invention relates to a method for the manufacture of a sensor element and to a sensor element. In the method, both surfaces of a sensor film are provided with metallic electrodes. The sensor...
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6912288 |
Piezoelectric electroacoustic transducer and manufacturing method of the same
A piezoelectric electroacoustic transducer, including a plurality of piezoelectric layers deposited to define a deposited product, flexurally vibrates the deposited product by polarizing the entire...
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6731763 |
Audio A/D converter using frequency modulation
According to the exemplary embodiments, a voltage or current-controlled oscillator is controlled in frequency by the signal (i.e., voltage or current) from a microphone. The frequency modulated...
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6606389 |
Piezoelectric film sonic emitter
A speaker device for emitting subsonic, sonic or ultrasonic compression waves comprising a a rigid emitter plate attached to the drum, and a plurality of apertures formed within the plate which are...
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6554761 |
Flextensional microphones for implantable hearing devices
This relates to flextensional microphones which are made up of a piezoelectric substrate having opposing surfaces, typically parallel surfaces when the substrate is crystalline or ceramic, and at...
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6347147 |
High noise suppression microphone
A noise suppressing microphone employing a thin film of piezoelectric material sandwiched between two conductive layers, one of which is laminated to a flat inflexible laminate. The sandwich is...
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6339368 |
Circuit for automatically driving mechanical device at its resonance frequency
A circuit for automatically driving a mechanical device at its resonance frequency is provided. To do so, the circuit detects non-resonance driving conditions of the mechanical device being coupled...
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6321428 |
Method of making a piezoelectric transducer having protuberances for transmitting acoustic energy
A method of forming an ultrasound transducer having thermoformed protuberances comprises providing a substrate having a plurality of perforations of a given dimension. The perforations or apertures...
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6295365 |
Acoustic sensor and electric stethoscope device incorporating the same therein
An acoustic sensor includes the following: a piezoelectric element constituted of a piezoelectric substance on which at least one electrode is provided, and a diaphragm on which the piezoelectric...
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6275594 |
Piezoelectric acoustic device
A piezoelectric acoustic device capable of permitting an increase in area or space of an operation face section of an electronic equipment required for arranging parts for the electronic equipment,...
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6222928 |
Universal impedance matcher for a microphone-to-radio connection
An impedance matching circuit couples a microphone's output to a radio's microphone input. A tap circuit is coupled to the microphone's output for extracting an audio signal therefrom. An amplifier...
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6122387 |
Piezoelectric loudspeaker
A piezoelectric loudspeaker has a membrane and at least two flexural piezoresonators, one end of which is fixed, while the other end acts mechanically upon the membrane. The membrane is a flat...
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5610987 |
Active noise control stethoscope
An active noise control stethoscope enables a physician or paramedic to check vital signs in the presence of high background noise levels. A digital processing technique is used to remove noise...
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5357577 |
Vacuum tube microphone apparatus
A microphone apparatus including a vacuum-tube amplifier amplifying an electric signal converted from an acoustic signal includes a thermo-ionic cooling element having two surfaces, in which a...
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5321761 |
Piezoelectric sound generator and method of its manufacture
A piezoelectric sound generator includes a piezoelectric device consisting of a metal diaphragm and a piezoelectric porcelain plate affixed to the diaphragm, a pair of connecting members having...
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5251264 |
Mechanical-vibration-cancelling piezo ceramic microphone
In applications where mechanical vibrations should not cause a microphone to produce an output signal, opposing and series connected PZT elements (A and B) are used to cancel mechanical shock or...
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5179595 |
Electrodynamic-fluidic transducer element for pneumatic loudspeaker
The support (17) forming the element has a diameter of a magnitude order higher than its height which is itself of a magnitude order higher than its thickness. It is rigidified by means of two...
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5151944 |
Headrest and mobile body equipped with same
The present invention provides a headrest (1C, 2C) in which a bone-conduction microphone (1B, 2B) is mounted in such a position as to be in contact with the back side of the head of the operator....
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4908855 |
Electronic telephone terminal having noise suppression function
An electronic telephone terminal having a transmitter and a receiver, both having an approximately linear acoustic-to-electric transduction characteristics, and having a surrounding noise...
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4899636 |
Instrument for tuning musical instruments
A tuning apparatus comprises a piezoelectric element provided on a tuner case, and a mounting member which enable the tuning apparatus to be mounted on a musical instrument to be tuned. The...
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4696045 |
Ear microphone
An ear microphone includes a bimorph piezoelectric transducer mounted on a PC board having an amplifier therein and surrounded by a helically wound spring. The piezoelectric transducer and spring...
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4692942 |
Electroacoustic transducer with piezoelectric diaphragm
The invention relates to electroacoustic transducers and more particularly to microphones in which the conversion of an acoustic vibration into an electric voltage is provided by a piezoelectric...
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4598417 |
Electronic stethoscope
An electronic stethoscope for reproducing at a user's ear as exactly as possible the sound pressure signals originating from a conventional diaphragm or bell type of chestpiece. The subject...
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4535205 |
Electroacoustic transducer of the piezoelectric polymer type
In a piezoelectric microphone or hydrophone, the elastic structure which reacts directly to the acoustic pressure is formed of piezoelectric polymer. The electroacoustic transducer according to the...
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4524247 |
Integrated electroacoustic transducer with built-in bias
Disclosed is an electroacoustic transducer structure which can be formed in a semiconductor substrate and incorporated as part of an integrated circuit, and which provides a built-in dc bias for...
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4280018 |
Integrated piezoelectric sound transducer and preamplifier
An integrated piezoelectric sound transducer and preamplifier is provided within a sealed enclosure and the preamplifier is powered through a coaxial cable utilized for the AC signal output of the...
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4156800 |
Piezoelectric transducer
A piezoelectric transducer including a member composed of at least two superposed plastics layers at least one of which is piezoelectric, the said at least one piezoelectric layer being sandwiched...
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3894198 |
Electrostatic-piezoelectric transducer
An electrostatic type electroacoustic transducer having improved acoustic characteristics is composed of a piezoelectric polymer-type oscillator having a stretching-type piezoelectric effect, such...
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3825848 |
INTEGRATED AMPLIFIER
An integrated circuit preamplifier formed on a single substrate divided into regions by insulation frames connected with the microphone of a telephone subset via transistor preamplifier and...
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3816671 |
ELECTRET TRANSDUCER CARTRIDGE AND CASE
An electret microphone is made of a cartridge subassembly including an electret diaphragm fastened to an apertured backplate having diaphragm support means and air vent means for balancing static...
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3660602 |
MICROPHONE CARTRIDGE WITH AMPLIFIER
The microphone of the invention obtains damping from a perforated baffle closely adjacent the diaphragm with fabric covering the perforations, and from resistive structures behind the baffle. The...
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3621154 |
STRAIN-SENSITIVE SEMICONDUCTIVE THIN FILM ELECTROACOUSTICAL TRANSDUCER
A transducer for converting low-level pressure variations (such as sound waves) into electrical signal variations. A strain-sensitive coating is applied to selected surface regions on a flexible...
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3440352 |
PIEZORESISTANCE ELEMENT MICROPHONE CIRCUIT
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3436493 |
ELECTROACOUSTIC TRANSDUCER WITH UNILATERAL DIRECTIONAL CHARACTERISTIC
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3431357 |
TONE CONTROL
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3385930 |
Electronic sound detector
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2795648 |
Dielectric amplifier employing ferroelectric materials
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