| 摘要 |
PROBLEM TO BE SOLVED: To make effectively cancelable an external noise. SOLUTION: This external noise reducing device is provided with a sound collection part 22R of an external noise arranged in a sound field to reduce the external noise, a noise cancel signal generation means 30 supplied with the sound collected external noise and generating a noise cancel signal for canceling the external noise and a sound emission part 24R sound emitting the noise cancel signal. The sound emission part 24R is arranged in the sound field canceling the external noise N. Thus, since the noise cancel signal -N is emitted to the same place as the sound collection place, the noise cancel effect becomes high.
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