Modulator—amplifier
First Claim
1. A modulator-amplifier configured for use in parametric sound reproduction systems for reproducing audio information in a medium, comprising:
- an input configured for receiving at least one input signal including audio information;
at least one reference signal generator configured for generating at least one reference signal;
at least one comparator coupled to the input and the reference signal generator configured for detecting a relationship between a first signal based on the at least one input signal and the at least one reference signal and generating a second signal based thereon;
at least one switching power stage coupled to the at least one comparator and configured to receive the second signal and drive an output signal including at least one sideband and audio information; and
wherein the relationship between the at least one input signal and the timing of state transitions in the switching power stage is non-linear.
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Accused Products
Abstract
A modulator-amplifier configured for use in parametric sound reproduction systems, including an input configured for receiving at least one input signal, a reference signal generator configured for generating a reference signal, and a comparator stage coupled to the input and the reference signal generator, the comparator stage configured for detecting relationships between a first signal based on the input signal and the reference signal. A switching power stage coupled to the comparator is configured to receive a second signal derived from a combination of an output from the comparators and the input signal, wherein there is a non-linear relationship between the input signal and the timing of state transitions in the switching power stage for the purpose of generating an output that has been shifted in frequency relative to a frequency of the input signal, and which includes at least one sideband.
94 Citations
39 Claims
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1. A modulator-amplifier configured for use in parametric sound reproduction systems for reproducing audio information in a medium, comprising:
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an input configured for receiving at least one input signal including audio information; at least one reference signal generator configured for generating at least one reference signal; at least one comparator coupled to the input and the reference signal generator configured for detecting a relationship between a first signal based on the at least one input signal and the at least one reference signal and generating a second signal based thereon; at least one switching power stage coupled to the at least one comparator and configured to receive the second signal and drive an output signal including at least one sideband and audio information; and wherein the relationship between the at least one input signal and the timing of state transitions in the switching power stage is non-linear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 39)
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29. A modulator-amplifier configured for use in parametric sound reproduction systems, comprising:
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a reference signal generator for generating a reference signal; an event detector-signal generator comprising at least one comparator configured for comparing an input signal with the reference signal and generating a timing signal based upon detected events in the input signal; a switching power output stage configured for modulating the reference signal based upon the timing signal, whereby signal modulation is integrated with power amplification of the signal to embody a non-linear relationship between the input signal and the timing of state transitions in the modulator-output stage. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A modulator-amplifier, comprising:
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a carrier signal generator; an event detector configured to generate a state change signal based upon detected events in an audio input signal, said event detector comparing the input signal to a reference signal; a modulator-switching power output stage configured for modulating a carrier for parametric sound reproduction based upon the state change signal, and wherein the timing of switching between steady state levels in said output stage is related to the audio input signal by a non-linear function; and wherein the switching frequency is selected from the group consisting of 2, 3, and 4 times the carrier frequency. - View Dependent Claims (36, 37, 38)
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Specification