Electronic muffler

Details Electronic muffler Electronic muffler

1993-12-22

1995-10-10

Brinich, Stephen

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 86, H03B 2900

Patent

active

054577497

ABSTRACT:
An electronic muffling device is disclosed for suppressing the noise emitted by an outlet of an exhaust pipe of an engine. The device comprises a housing having an outlet and a plurality of audio transducers. The transducers supply anti-noise to cancel detected unwanted noise. A microphone appropriately positioned to detect residual noise is coupled to a cancellation signal generator, which controls the anti-noise generated by the transducers. Anti-noise and unwanted engine noise propagate through a front volume within the housing so that exhaust gases are transmitted through the housing, but engine noise is canceled before leaving the housing. Exhaust gas may be transmitted into the housing, or may be passed through the housing without leaving the exhaust pipe. In either embodiment, engine noise enters the front volume and is canceled.

REFERENCES:
patent: 4527282 (1985-07-01), Chaplin et al.
patent: 5097923 (1992-03-01), Ziegler et al.
patent: 5146505 (1992-09-01), Pfaff et al.
patent: 5216722 (1993-06-01), Popovich
patent: 5222148 (1993-06-01), Yuan
patent: 5255321 (1993-10-01), Murray et al.
patent: 5325437 (1994-06-01), Doi et al.
patent: 5363450 (1994-11-01), Moody et al.
patent: 5363451 (1994-11-01), Martinez et al.
"Anti-noise--the Essex Breakthrough", Prof. Barrie Chaplin Chartered Mechanical Engineer Jan. 1983 p. 41.

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