发明名称 |
CONTROL METHOD FOR ACTIVE SOUNDPROOFING DEVICE |
摘要 |
PURPOSE:To attain the silencing of a selective sound and to simplify the maintenance and inspection of the device because a microphone which has a little durability isn't used by detecting the oscillation of a noise generating source so as to make a control sound. CONSTITUTION:On the cylinder head 12 of an internal combustion engine 11 an accelerating pickup 13 is attached as the detector of oscillation and the oscillation signal (v) of the engine from the accelerating pickup 13 is conducted to a filter 14. And in the filter 14 a control signal (e) is made and amplified in an amplifier 15 to drive a speaker 16, so that a control sound is emitted into an exhaust pipe 17. Now a microphone 18 for detecting the residual value (r) of the exhaust noise at the end of the exhaust pipe 17 is used so as to decide the characteristic of the filter 14 and if the characteristic of the filter is decided once the microphone 18 isn't needed. |
申请公布号 |
JPS635696(A) |
申请公布日期 |
1988.01.11 |
申请号 |
JP19860148121 |
申请日期 |
1986.06.26 |
申请人 |
MITSUI ENG & SHIPBUILD CO LTD |
发明人 |
MIHASHI KUNIHIRO |
分类号 |
F02B77/13;F01N1/06;H04R3/00 |
主分类号 |
F02B77/13 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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