Parametric audio system for operation in a saturated air medium
First Claim
Patent Images
1. A method for operating a parametric loudspeaker system in both a non-saturated air medium and a saturated air medium, comprising:
- a) receiving at least one audio input signal;
b) generating an ultrasonic carrier signal;
c) parametrically modulating the audio input signal and ultrasonic carrier signal to produce a parametric ultrasonic signal;
d) operating a signal processor in a first predetermined signal processing mode when the parametric loudspeaker is operating in the non-saturated air medium to create a double sideband parametric ultrasonic signal having a low modulation index;
e) operating the signal processor in a second predetermined signal processing mode that is distinct from the first predetermined signal processing mode when the parametric loudspeaker is operating in the saturated air medium to create a double sideband parametric ultrasonic signal having a higher modulation index than that of the first predetermined signal processing mode; and
f) emitting a parametric ultrasonic wave into the air medium to produce a decoupled audio wave.
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Abstract
A parametric loudspeaker system and method for reducing distortion in a decoupled audio wave by creating a double sideband parametric ultrasonic signal that substantially approximates a non-square-rooted modulation envelope and emitting a parametric ultrasonic wave that corresponds to the double sideband parametric ultrasonic signal from a parametric loudspeaker at a sufficient amplitude to drive the surrounding air into saturation.
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Citations
17 Claims
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1. A method for operating a parametric loudspeaker system in both a non-saturated air medium and a saturated air medium, comprising:
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a) receiving at least one audio input signal; b) generating an ultrasonic carrier signal; c) parametrically modulating the audio input signal and ultrasonic carrier signal to produce a parametric ultrasonic signal; d) operating a signal processor in a first predetermined signal processing mode when the parametric loudspeaker is operating in the non-saturated air medium to create a double sideband parametric ultrasonic signal having a low modulation index; e) operating the signal processor in a second predetermined signal processing mode that is distinct from the first predetermined signal processing mode when the parametric loudspeaker is operating in the saturated air medium to create a double sideband parametric ultrasonic signal having a higher modulation index than that of the first predetermined signal processing mode; and f) emitting a parametric ultrasonic wave into the air medium to produce a decoupled audio wave. - View Dependent Claims (2, 3, 4, 5)
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6. A parametric loudspeaker system for operating in both a non-saturated air medium and a saturated air medium, comprising:
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ultrasonic carrier and audio input signal sources for providing an ultrasonic carrier signal and an audio input signal; a signal processor coupled to the ultrasonic carrier and audio input signal sources, operating in a first predetermined signal processing mode when the parametric loudspeaker is operating in the non-saturated air medium configurable to reduce distortion introduced in a decoupled audio wave in the non-saturated air medium, and operating in a second predetermined signal processing mode when the parametric loudspeaker is operating in the saturated air medium for creating a double sideband parametric ultrasonic signal; wherein the first predetermined signal processing mode is configured to create a double sideband parametric ultrasonic signal having a modulation envelope that substantially matches an amplitude modulated version of a square-rooted audio input signal, and the second predetermined signal processing mode is configured to produce the double sideband parametric ultrasonic signal wherein the double sideband parametric ultrasonic signal having a modulation envelope that substantially matches an amplitude modulated version of a non-square-rooted audio input signal; and an electro-acoustical emitter coupled to the signal processor for emitting a parametric ultrasonic wave. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for operating a parametric loudspeaker system in both a non-saturated air medium and a saturated air medium, comprising:
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a) receiving at least one audio input signal; b) generating an ultrasonic carrier signal; c) parametrically modulating the audio input signal and ultrasonic carrier signal to produce a parametric ultrasonic signal; d) operating a signal processor in a first predetermined signal processing mode when the parametric loudspeaker is operating in the non-saturated air medium to create a double sideband parametric ultrasonic signal, wherein a modulation envelope of the double sideband parametric ultrasonic signal substantially matches an amplitude modulated version of a square-rooted audio input signal; e) operating the signal processor in a second predetermined signal processing mode that is distinct from the first predetermined signal processing mode when the parametric loudspeaker is operating in the saturated air medium to create a double sideband parametric ultrasonic signal, wherein the modulation envelope substantially matches an amplitude modulated version of a non-square-rooted audio input signal; and f) emitting a parametric ultrasonic wave into the air medium to produce a decoupled audio wave. - View Dependent Claims (14, 15)
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16. A method for operating a parametric loudspeaker system in both a non-saturated air medium and a saturated air medium, comprising:
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a) receiving at least one audio input signal; b) generating an ultrasonic carrier signal; c) parametrically modulating the audio input signal and ultrasonic carrier signal to produce a parametric ultrasonic signal; d) operating a signal processor in a first predetermined signal processing mode when the parametric loudspeaker is operating in the non-saturated air medium to create a double sideband parametric ultrasonic signal from a preprocessed square-rooted audio input signal; e) operating the signal processor in a second predetermined signal processing mode that is distinct from the first predetermined signal processing mode when the parametric loudspeaker is operating in the saturated air medium to create a double sideband parametric ultrasonic signal from a non-square-rooted audio input signal; and f) emitting a parametric ultrasonic wave into the air medium to produce a decoupled audio wave.
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17. A parametric loudspeaker system for operating in both a non-saturated air medium and a saturated air medium, comprising:
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ultrasonic carrier and audio input signal sources for providing an ultrasonic carrier signal and an audio input signal; a signal processor coupled to the ultrasonic carrier and audio input signal sources, operating in a first predetermined signal processing mode when the parametric loudspeaker is operating in the non-saturated air medium configurable to reduce distortion introduced in a decoupled audio wave in the non-saturated air medium, and operating in a second predetermined signal processing mode when the parametric loudspeaker is operating in the saturated air medium for creating a double sideband parametric ultrasonic signal; wherein the first predetermined signal processing mode is configured to create the double sideband parametric ultrasonic signal from a preprocessed square-rooted audio input signal, and the second predetermined signal processing mode is configured to create the double sideband parametric ultrasonic signal from a non-square-rooted audio input signal; and an electro-acoustical emitter coupled to the signal processor for emitting a parametric ultrasonic wave.
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Specification