Resonant tuned, ultrasonic electrostatic emitter
First Claim
1. An ultrasonic emitter device for converting electrical signals to audio output by acoustic heterodyning of ultrasonic emissions, said device comprising:
- a rigid core member having a top surface which includes an array of cavities of predetermined size and including means for enhancement of at least one resonant frequency operable as a carrier frequency within an ultrasonic frequency range;
means for developing an electrostatic field at the top surface of the core member;
a resilient, dielectric diaphragm disposed in tension along the top surface and across the cavities of the core member to allow an intended range of orthogonal displacement of emitting sectors of the diaphragm which are positioned over the cavities of the core member and within a strong portion of the electrostatic field;
a conductive medium applied to one face of the diaphragm and being electrically isolated from the core member; and
modulating means coupled to the conductive medium for enabling a variable electrostatic field to be applied to the diaphragm which interacts with the electrostatic field of the core member to develop a series of ultrasonic compression waves emanating from the emitting sectors of the diaphragm within a desired ultrasonic resonant frequency range which propagate the series of ultrasonic compression waves which are demoduled within a nonlinear air medium to generate audio output.
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Abstract
An ultrasonic emitter device for converting electrical signals to audio output by acoustic heterodyning of ultrasonic emissions. The device comprises a rigid core member having a top surface which includes an array of cavities of predetermined size and means for enhancement of at least one resonant frequency operable as a carrier frequency within an ultrasonic frequency range. An electrostatic field is generated at the top surface of the core member, and operates with respect to a resilient, dielectric diaphragm disposed in tension along the top surface and across the cavities to allow an intended range of orthogonal displacement of emitting sectors of the diaphragm positioned over the cavities and within a strong portion of the electrostatic field. A conductive medium is applied to one face of the diaphragm and is electrically isolated from the core member. A modulating circuit coupled to the conductive medium develops a variable electrostatic field to be applied to the diaphragm which interacts with the electrostatic field of the core member to develop a series of ultrasonic compression waves emanating from the emitting sectors of the diaphragm within the desired ultrasonic resonant frequency range and which propagate the series of ultrasonic compression waves which are demoduled within a nonlinear air medium to generate audio output.
63 Citations
21 Claims
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1. An ultrasonic emitter device for converting electrical signals to audio output by acoustic heterodyning of ultrasonic emissions, said device comprising:
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a rigid core member having a top surface which includes an array of cavities of predetermined size and including means for enhancement of at least one resonant frequency operable as a carrier frequency within an ultrasonic frequency range; means for developing an electrostatic field at the top surface of the core member; a resilient, dielectric diaphragm disposed in tension along the top surface and across the cavities of the core member to allow an intended range of orthogonal displacement of emitting sectors of the diaphragm which are positioned over the cavities of the core member and within a strong portion of the electrostatic field; a conductive medium applied to one face of the diaphragm and being electrically isolated from the core member; and modulating means coupled to the conductive medium for enabling a variable electrostatic field to be applied to the diaphragm which interacts with the electrostatic field of the core member to develop a series of ultrasonic compression waves emanating from the emitting sectors of the diaphragm within a desired ultrasonic resonant frequency range which propagate the series of ultrasonic compression waves which are demoduled within a nonlinear air medium to generate audio output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for emitting audio output from interfering ultrasonic frequencies which include a carrier frequency and modulated side bands corresponding to mixed audio signals within the ultrasonic frequencies, the method comprising the steps of:
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(a) providing a uniform array of cavities across a surface of a supporting core member wherein the array of cavities are configured to generate a predetermined ultrasonic frequency operable as the carrier frequency; (b) maintaining a movable diaphragm in stretched configuration across the cavities and along the core member to allow an intended range of orthogonal displacement of the diaphragm with respect to the cavities and within a strong portion of a variable electrostatic field; and (c) inductively coupling a variable current flow having the modulated ultrasonic frequencies to the movable diaphragm for developing a second electrostatic field which variably interacts with the first electrostatic field to displace the diaphragm in response to the carrier frequency and modulated side bands. - View Dependent Claims (20, 21)
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Specification