Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Counterwave generation control path
Patent
1995-11-24
1998-10-13
Lee, Thomas D.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Counterwave generation control path
381 711, 381 715, 381 941, A61F 1106
Patent
active
058224394
ABSTRACT:
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 which is arranged near the tail pipe and of which the open surface has a constant angle with respect to a vertical plane, an enclosure which closes the rear portion of the speaker, and a silencing sound guide portion which guides silencing sounds emitted from the front surface of the speaker to the outlet of the tail pipe. A closed space into which a bumper for absorbing impact in case of collision is made, is used as a resonant-cavity of said speaker. Based on the amount of silencing noise which becomes greater as a plurality of microphones are arranged to be closer to the speaker, the outputs of the plurality of microphones apart a constant distance from said speaker are synthesized.
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Babasaki Masahiro
Nagami Masaaki
Sakiyama Kazuhiro
Sako Kazuya
Fujitsu Ten Limited
Grant II Jerome
Lee Thomas D.
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