Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-04-24
2007-04-24
Nguyen, Khanh Van (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S20700P, C330S251000
Reexamination Certificate
active
10536999
ABSTRACT:
In an audio amplifier having a D-class power amplifier, a noise upon muting is suppressed. A sampling rate converter circuit for sampling rate converting a digital audio signal into a digital audio signal, and a ΔΣ modulation circuit for re-quantizing the digital audio signal into a bit-reduced digital audio signal are provided. Further, a PWM modulation circuit for converting the digital audio signal into a PWM signal, and a D-class power amplifier to which the PWM signal are supplied. Still further, a dither signal forming circuit for superimposing a dither signal SDI on the digital audio signal, and a forming circuit for forming a muting signal SDET are provided. Upon muting, an input side of the sampling rate converter circuit is stopped by the muting signal SDET.
REFERENCES:
patent: 5777512 (1998-07-01), Tripathi et al.
patent: 6014055 (2000-01-01), Chester
patent: 6586991 (2003-07-01), Masuda et al.
patent: 6842070 (2005-01-01), Nilsson
patent: 4-115722 (1992-04-01), None
patent: 2001-237708 (2001-08-01), None
patent: 2002-158543 (2002-05-01), None
patent: 2002-158550 (2002-05-01), None
Masuda Toshihiko
Ohkuri Kazunobu
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