| 摘要 |
The noise canceling system includes: a microphone unit picking up ambient noise and outputting a noise signal; a cancel signal generator generating and outputting a cancel signal eliminating the noise, and having a filter circuit outputting a signal in a predetermined frequency band included in the noise signal, an inverting amplifier circuit inverting and amplifying the output signal of the filter circuit, an amplification degree being greater than zero and smaller than one, and an adding circuit outputting a signal obtained by adding the output signal of the inverting amplifier circuit to the noise signal; and a speaker unit outputting an audio signal and the cancel signal.
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