Audio system for improving a signal to noise ratio

Details Audio system for improving a signal to noise ratio Audio system for improving a signal to noise ratio

2008-05-15

2011-11-08

Nguyen, Cuong Q (Department: 2811)

Electrical audio signal processing systems and devices

Binaural and stereophonic

C381S121000

Reexamination Certificate

active

08054979

ABSTRACT:
An audio system performing a class-D amplification includes a first pulse width modulation (PWM) signal generation unit and a second PWM signal generation unit. The first PWM signal generation unit generates a first switching signal based on a first audio signal. The second PWM signal generation unit generates a second switching signal based on a second audio signal. The second switching signal has a frequency difference with respect to the first switching signal such that a harmonic frequency component generated by interference between the first switching signal and the second switching signal is removed. Accordingly, the audio system performing the class-D amplification may improve a signal to noise ratio by minimizing influence of the harmonic frequency components on the first and second switching signals.

REFERENCES:
patent: 5848168 (1998-12-01), Shipps et al.
patent: 2009/0116654 (2009-05-01), Hansen et al.
patent: 2004-048333 (2004-02-01), None
patent: 1020050036812 (2005-04-01), None
patent: 1020050050608 (2005-05-01), None

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