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Active sound attenation system for engine exhaust systems and the like

  • US 5,097,923 A
  • Filed: 11/07/1989
  • Issued: 03/24/1992
  • Est. Priority Date: 02/19/1988
  • Status: Expired due to Term
First Claim
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1. An active noise suppression system for exhaust of a combustion engine comprising:

  • an exhaust transfer pipe, coupled to the combustion engine and having first and second ends, for transferring exhaust gas in a first direction from the combustion engine to ambient atmosphere, said first end receiving the exhaust gas from the combustion engine and said second end emitting the exhaust gas to the ambient atmosphere;

    an anti-noise chamber, annularly surrounding an outer periphery of said exhaust transfer pipe and having an outlet open to the ambient atmosphere adjacent said second end of said exhaust transfer pipe, for projecting anti-noise sound waves through said outlet to the ambient atmosphere;

    an anti-noise speaker, mounted to said anti-noise chamber for communication therewith, for generating and projecting said anti-noise sound waves into said anti-noise chamber to cancel noise generated by the combustion engine exhaust;

    separation means for isolating said anti-noise chamber from exhaust gas.

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