Active sound attenation system for engine exhaust systems and the like
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United States of America Patent
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Mar 24, 1992
Issued Date -
N/A
app pub date -
Nov 7, 1989
filing date -
Feb 19, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An active sound attenation system for combustion engine exhaust systems and the like is disclosed. To protect the counter-noise acoustic wave generator from the environment of the medium propagating the undesirable noise, an acoustically tuned anti-noise chamber is interposed between the wave generators 19, 19A and the location of the medium with the undesirable noise. To provide for global cancellation at the outlet end 4, of the exhaust pipe 10, the anti-noise chamber 11, 11A has an annular opening disposed substantially in the plane 4 of the exhaust pipe outlet thereby giving the undesirable noise and the cancelling noise an apparent common source.
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