Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2005-09-09
2008-12-02
Mottola, Steven J (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C381S120000
Reexamination Certificate
active
07459968
ABSTRACT:
An audio power amplifier IC which is capable of suppressing degradation in sound quality resulting from the frequency of a reference clock, and an audio system provided with the audio power amplifier IC are provided. The audio power amplifier IC includes a clock generation circuit generating an internal clock, a clock terminal for outputting the internal clock or receiving an external clock, a clock selection circuit selecting the internal clock or the external clock as a reference clock, a first audio signal input terminal for receiving a first audio signal, and a first digital power amplifier circuit performing pulse modulation on the first audio signal based on the reference clock to output a pulse synchronized with the reference clock.
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Ohama Shigeji
Oishi Satoshi
Souma Masatsugu
Fish & Richardson P.C.
Mottola Steven J
Rohm & Co., Ltd.
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