Power amplification for parametric loudspeakers
First Claim
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1. A power amplifier system to provide improved power efficiency in a parametric loudspeaker system, comprising:
- (a) a switching power stage in the power amplifier;
(b) wherein a carrier frequency signal can be amplified by the switching power stage;
(c) and wherein an audio frequency range signal giving rise to at least one corresponding sideband frequency signal different from the carrier frequency signal when the carrier signal is modulated by the audio frequency range signal can be used to modulate the carrier and a corresponding at least one sideband frequency is also amplified by the switching power stage;
(d) at least one transducer, electrically coupled to the power amplifier; and
,(e) wherein a switching frequency of the switching power stage is less than ten times the highest frequency of a modulated carrier frequency signal to be reproduced in the parametric loudspeaker system.
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Abstract
A power amplifier for a parametric loudspeaker system which utilizes switch-mode power conversion to increase efficiency. The power amplifier is configured to coordinate the switching frequency of the amplifier with the carrier frequency of the parametric loudspeaker system, so a lower switching frequency may be used even though the power amplifier must amplify ultrasonic signals. The amplifier can be further optimized to counteract the reactance of the transducer load at the carrier frequency.
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Citations
24 Claims
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1. A power amplifier system to provide improved power efficiency in a parametric loudspeaker system, comprising:
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(a) a switching power stage in the power amplifier; (b) wherein a carrier frequency signal can be amplified by the switching power stage; (c) and wherein an audio frequency range signal giving rise to at least one corresponding sideband frequency signal different from the carrier frequency signal when the carrier signal is modulated by the audio frequency range signal can be used to modulate the carrier and a corresponding at least one sideband frequency is also amplified by the switching power stage; (d) at least one transducer, electrically coupled to the power amplifier; and
,(e) wherein a switching frequency of the switching power stage is less than ten times the highest frequency of a modulated carrier frequency signal to be reproduced in the parametric loudspeaker system. - 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 power amplifier system to provide improved power efficiency in a parametric loudspeaker system, comprising:
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(a) a switching power stage in the power amplifier; (b) wherein an ultrasonic carrier frequency signal can be amplified by the switching power stage; (c) and wherein an audio frequency range is used to modulate the carrier frequency signal so as to have at least one corresponding sideband frequency divergent from the carrier frequency in a modulated ultrasonic carrier frequency signal which can be likewise amplified; (d) at least one transducer configured for parametric signal reproduction, electrically coupled to the power amplifier; and (e) wherein the switching frequency in the switching power stage is less than ten times the highest frequency to be parametrically reproduced at the transducer based on the modulated carrier signal. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification