Active acoustic attenuation mixing chamber
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United States of America Patent
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Sep 3, 1991
Grant Date -
N/A
app pub date -
Jan 23, 1990
filing date -
Jan 23, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Active acoustic attenuation apparatus is provided for cancellation of noise from an exhaust pipe (12). A chamber (50) has an input (70) receiving exhaust from the exhaust pipe and directing the exhaust along a flowpath (76) to a chamber output (74). Speakers (88, 90) are transversely spaced and offset from the flowpath and introduce sound into the chamber at a space (56) having a transverse area at least as large as each speaker, to minimize acoustic loading of the speakers and to protect the speakers from the heat of hot exhaust for automotive applications, including electronic mufflers.
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