Amplification system, carrier tracking systems and related methods for use in parametric sound systems
First Claim
1. A signal processing system for generating an ultrasonic signal from an audio signal, comprising:
- a compressor, operable to compress the audio signal;
an equalization circuit, operable to equalize the audio signal;
a modulation circuit, operable to combine the audio signal with a carrier signal to produce at least one modulated carrier signal, the modulated carrier signal being of sufficient intensity so as to demodulate when emitted into a non-linear medium; and
a voltage detection and control circuit, operable to;
i) detect a voltage of the modulated carrier signal;
ii) compare the detected voltage of the modulated carrier signal to a desired voltage; and
iii) cause the voltage of the modulated carrier signal to be adjusted if the compared voltage differs by a predetermined amount from the desired voltage.
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0 Petitions
Accused Products
Abstract
A signal processing system for generating an ultrasonic signal from an audio signal comprises a compressor, operable to compress the audio signal, and an equalization circuit, operable to equalize the audio signal. A modulation circuit is operable to combine the audio signal with a carrier signal to produce at least one modulated carrier signal. A voltage detection and control circuit is operable to: detect a voltage of the modulated carrier signal; compare the detected voltage of the modulated carrier signal to a desired voltage; and cause the voltage of the modulated carrier signal to be adjusted if the compared voltage differs by a predetermined amount from the desired voltage.
179 Citations
20 Claims
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1. A signal processing system for generating an ultrasonic signal from an audio signal, comprising:
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a compressor, operable to compress the audio signal; an equalization circuit, operable to equalize the audio signal; a modulation circuit, operable to combine the audio signal with a carrier signal to produce at least one modulated carrier signal, the modulated carrier signal being of sufficient intensity so as to demodulate when emitted into a non-linear medium; and a voltage detection and control circuit, operable to; i) detect a voltage of the modulated carrier signal; ii) compare the detected voltage of the modulated carrier signal to a desired voltage; and iii) cause the voltage of the modulated carrier signal to be adjusted if the compared voltage differs by a predetermined amount from the desired voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal processing system for generating an ultrasonic signal from an audio signal, comprising:
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a compressor, operable to compress the audio signal; an equalization circuit, operable to equalize the audio signal; a modulation circuit, operable to combine the audio signal with a carrier signal to produce at least one modulated carrier signal, the modulated carrier signal being of sufficient intensity so as to demodulate when emitted into a non-linear medium; and a frequency detection and control circuit, operable to; i) detect a voltage of the modulated carrier signal; ii) compare the detected voltage of the modulated carrier signal to a desired voltage; and iii) cause the frequency of the modulated carrier signal to be adjusted if the compared voltage differs by a predetermined amount from the desired voltage. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of processing an audio signal to be provided to an ultrasonic emitter, the method comprising:
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compressing an audio signal; equalizing the audio signal; combining the audio signal with a carrier signal to produce at least one modulated carrier signal, the modulated carrier signal being of sufficient intensity so as to demodulate when emitted into a non-linear medium; detecting a voltage of the modulated carrier signal; comparing the detected voltage of the modulated carrier signal to a desired voltage; and causing the voltage of the modulated carrier signal to be adjusted if the compared voltage differs by a predetermined amount from the desired voltage. - View Dependent Claims (14, 15, 16)
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17. A method of processing an audio signal to be provided to an ultrasonic emitter, the method comprising:
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compressing an audio signal; equalizing the audio signal; combining the audio signal with a carrier signal to produce at least one modulated carrier signal, the modulated carrier signal being of sufficient intensity so as to demodulate when emitted into a non-linear medium; detecting an average voltage amplitude of the modulated carrier signal; comparing the detected average voltage amplitude of the modulated carrier signal to a desired reference voltage; and causing the frequency of the modulated carrier signal to be adjusted if the compared voltage differs by a predetermined amount from the desired voltage. - View Dependent Claims (18, 19, 20)
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Specification