Audio signal output control device that suppresses pop sound

Details Audio signal output control device that suppresses pop sound Audio signal output control device that suppresses pop sound

2011-06-07

2011-06-07

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Soft switching, muting, or noise gating

C381S120000, C381S123000, C330S010000

Reexamination Certificate

active

07957544

ABSTRACT:
The potential of a smoothing capacitor for a speaker is smoothly changed by controlling the potential with use of a PWM signal and switching between outputting the PWM signal and an actual audio signal, thereby suppressing a pop sound. The scale of circuitry is reduced and cost is lowered by implementing a PWM circuit in a one-chip microcontroller. Noise is eliminated by outputting a pulse that has been divided in the PWM signal generation stage.

REFERENCES:
patent: 6720825 (2004-04-01), Hansen et al.
patent: 7142048 (2006-11-01), Miyagaki et al.
patent: 7279965 (2007-10-01), Hansen et al.
patent: 7312654 (2007-12-01), Roeckner et al.
patent: 7417504 (2008-08-01), Strydom et al.
patent: 2003/0058040 (2003-03-01), Miyagaki et al.
patent: 2005/0246163 (2005-11-01), Ono et al.
patent: 2001-223536 (2001-08-01), None

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