Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2006-06-13
2006-06-13
Pascal, Robert (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
Reexamination Certificate
active
07061312
ABSTRACT:
Systems and methods for reducing the noise level in a multi-channel digital audio system by staggering the timing of the pulse-width modulation in the different channels and thereby reducing the magnitude and increasing the frequency characteristics of the generated switching noise. One embodiment comprises a multi-channel digital PWM amplifier in which the timing signals used by each channel's modulator are staggered to evenly space the switching edges of the generated PWM signals. An additional, complementary delay is implemented in each of the channels to equalize the total delay for each channel so that the outputs of the channels are synchronized. The different channels may be implemented on different chips, in which case the chips may be synchronized prior to staggering the signals processed in each of the channels.
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Andersen Jack B.
Taylor Wilson E.
D2Audio Corporation
Flanagan Krista M.
Law Office of Mark L. Berrier
Pascal Robert
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