Parametric sound system with lower sideband
First Claim
Patent Images
1. A parametric loudspeaker system, comprising:
- a carrier frequency generator to produce a carrier frequency;
a modulator that receives an audio signal and modulates the audio signal onto the carrier frequency to produce a modulated signal;
a sideband frequency divergent from the carrier frequency by a frequency value of the audio signal; and
wherein the sideband frequency operates at frequencies lower than the carrier frequency.
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Abstract
This invention provides a parametric loudspeaker system, with a carrier frequency generator to produce a carrier frequency. A modulator receives an audio signal and modulates it onto the carrier frequency, producing a modulated signal. This modulation creates at least one sideband signal that is divergent from the carrier frequency by the frequency value of the audio signal. Additionally, the sideband signal is created such that its frequency value is lower than the frequency of the carrier.
18 Citations
13 Claims
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1. A parametric loudspeaker system, comprising:
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a carrier frequency generator to produce a carrier frequency;
a modulator that receives an audio signal and modulates the audio signal onto the carrier frequency to produce a modulated signal;
a sideband frequency divergent from the carrier frequency by a frequency value of the audio signal; and
wherein the sideband frequency operates at frequencies lower than the carrier frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A parametric loudspeaker system, comprising:
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a carrier frequency generator to produce a carrier frequency;
a modulator that receives an audio signal and modulates the audio signal onto the carrier frequency to produce a modulated signal;
a sideband frequency divergent from the carrier frequency by the frequency value of the audio signal; and
wherein the sideband frequency is generated such that sideband frequencies associated with higher audio input frequencies are at frequencies associated with lower acoustic saturation in air than sideband frequencies associated with lower audio input frequencies.
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11. A parametric loudspeaker system, comprising:
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a carrier frequency generator to produce a carrier frequency;
a modulator that receives an audio signal and modulates the audio signal onto the carrier frequency to produce a modulated signal;
a sideband frequency divergent from the carrier frequency by the frequency value of the audio signal; and
a lower frequency sideband closer to a high frequency audible range than a higher frequency sideband, is on average a lower amplitude signal level than all relatively higher frequency sideband frequencies. - View Dependent Claims (12, 13)
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Specification