| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital amplifier capable of preventing analog audio signals from being reproduced from a speaker when the volume of the analog audio signals reproduced from the speaker is turned to zero and when the input of digital audio signals or input signals is stopped. SOLUTION: In the case that a coefficient detection part detects that a coefficient to be multiplied with the digital audio signals by an amplification degree adjusting part is zero, and in the case that a silence signal discrimination part discriminates that inputted digital audio signals are the digital audio signals at a silent level, a silent PWM signal output part outputs PWM signals whose duty ratio is 50%. COPYRIGHT: (C)2004,JPO&NCIPI
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