| 摘要 |
<p>A noise control device disposed at the outlet of a tail pipe which emits exhaust noise of an automobile to silence noise from the tail pipe comprises a speaker (3).</p><p>Based on the amount of silencing noise which becomes greater as a plurality of microphones (5-1, 5-2, 5-3) are arranged to be closer to the speaker (3,4), the outputs of the plurality of microphones (5-1, 5-2, 5-3) apart a constant distance from said speaker (3) are synthesized.</p> |
