Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Reexamination Certificate
2005-07-19
2005-07-19
Mis, David (Department: 2817)
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
C332S107000, C330S010000, C360S029000
Reexamination Certificate
active
06919771
ABSTRACT:
An object of the present invention is to provide a digital amplifier which is capable of preventing a reproduction of an analogue audio signal from a loud speaker, when an output sound volume from the loud speaker is set to zero and when inputting of a digital audio signal or an input signal is stopped. In order to achieve the object, in the digital amplifier of the present invention, a silent PWM signal output section7outputs a PWM signal having a duty ratio of 50%, instead of a PWM signal generated by the PWM signal generating section6, in the following cases: the factor detecting section3detects that the digital audio signal is multiplied by the factor “0” in the gain regulation section2, the silent signal determining section4determines that the signal input from the reproducing unit13is stopped, and the silent signal determining section4determines that the digital audio signal is a signal at a silent level.
REFERENCES:
patent: 4142066 (1979-02-01), Ahamed
patent: 4371972 (1983-02-01), Schwarz et al.
patent: 4812815 (1989-03-01), Miyakoshi et al.
patent: 5200750 (1993-04-01), Fushiki et al.
patent: 5682162 (1997-10-01), Hamasaki et al.
patent: 5986498 (1999-11-01), Rodriguez
patent: 6392476 (2002-05-01), Rodriguez
patent: 6683494 (2004-01-01), Stanley
patent: 2002/0001342 (2002-01-01), Berkhout
patent: 2001-292040 (2001-10-01), None
Denon Ltd.
Dickstein , Shapiro, Morin & Oshinsky, LLP
Mis David
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