Circuit and method for reducing popping sound

Details Circuit and method for reducing popping sound Circuit and method for reducing popping sound

2011-07-26

2011-07-26

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S172000

Reexamination Certificate

active

07986179

ABSTRACT:
A circuit for reducing popping sound comprises a waveform generator, a voltage accumulator, and a comparator. The waveform generator is configured for generating a periodic waveform, and the voltage accumulator is configured for generating an increased voltage. The comparator is configured for comparing the periodic waveform with the increased voltage for generating a successive pulse signal. A percentage of a duty cycle in the successive pulse signal is increased gradually.

REFERENCES:
patent: 6137240 (2000-10-01), Bogdan
patent: 6674272 (2004-01-01), Hwang
patent: 7046082 (2006-05-01), Komiya et al.
patent: 7138841 (2006-11-01), Li et al.
patent: 7772903 (2010-08-01), Jiang et al.
patent: 2008/0143408 (2008-06-01), Paillet et al.

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