Substantially planate parametric emitter and associated methods
First Claim
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1. A parametric speaker, comprising:
- a substantially rigid, planate radiating element, suitable for radiating ultrasonic vibrations into a nonlinear medium, the planate radiating element comprising a continuous sheet of material devoid of openings;
an emitter, having an output frequency that is in the ultrasonic audio range, the emitter being intimately coupled in direct contact with the radiating element; and
a signal processing system, electronically coupled to the emitter, the signal processing system operable to deliver to the emitter a modulated ultrasonic signal;
whereinthe radiating element is physically configured to have a mechanical resonance that substantially matches the output frequency of the emitter.
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Abstract
A parametric speaker comprises a generally planate radiating element, suitable for radiating ultrasonic vibrations into a fluid medium, and an emitter, having an ultrasonic output and/or resonant frequency, the emitter being intimately coupled to the radiating element. The radiating element is physically configured to have a mechanical resonance that substantially matches the output and/or resonant frequency of the emitter.
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Citations
19 Claims
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1. A parametric speaker, comprising:
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a substantially rigid, planate radiating element, suitable for radiating ultrasonic vibrations into a nonlinear medium, the planate radiating element comprising a continuous sheet of material devoid of openings; an emitter, having an output frequency that is in the ultrasonic audio range, the emitter being intimately coupled in direct contact with the radiating element; and a signal processing system, electronically coupled to the emitter, the signal processing system operable to deliver to the emitter a modulated ultrasonic signal;
whereinthe radiating element is physically configured to have a mechanical resonance that substantially matches the output frequency of the emitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A parametric speaker, comprising:
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a substantially rigid, planate radiating element, suitable for radiating ultrasonic vibrations into a nonlinear medium, the planate radiating element comprising a continuous sheet of material devoid of openings; an emitter, having an output and/or resonant frequency that is in the ultrasonic audio range, the emitter being intimately coupled in direct contact with the radiating element; a signal processing system, electronically coupled to the emitter, the signal processing system operable to deliver to the emitter a modulated ultrasonic signal; the radiating element being physically configured to have a mechanical resonance that substantially matches the output frequency of the emitter; and a mechanical stiffening system, the mechanical stiffening system serving to alter a mechanical resonance of the radiating element.
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18. A method of forming a parametric speaker, comprising:
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obtaining a substantially rigid, planate radiating element, the planate radiating element comprising a continuous sheet of material devoid of openings; intimately bonding an emitter in direct contact with the radiating element, the emitter having an ultrasonic output and/or resonant frequency; physically altering the radiating element such that it exhibits a mechanical resonance that substantially matches the output and/or resonant frequency of the emitter, if the radiating element does not already exhibit a mechanical resonance that substantially matches the emitter frequency; and electronically coupling to the emitter a signal processing system suitable for delivering to the emitter an ultrasonic signal having an audio signal modulated thereon.
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19. A method of providing an audible audio signal, comprising:
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obtaining a substantially rigid planate radiating element comprising a continuous sheet of material devoid of openings, the radiating element having an emitter intimately bonded thereto in direct contact therewith, the radiating element having a mechanical resonance that substantially matches an output and/or resonant, ultrasonic frequency of the emitter; providing to the emitter an ultrasonic signal modulated by an audio signal to cause the radiating element to radiate the modulated ultrasonic signal to thereby cause an audible difference signal being produced in a fluid medium adjacent the radiating element.
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Specification