Active noise control system with two stage conditioning

Details Active noise control system with two stage conditioning Active noise control system with two stage conditioning

1990-04-25

1991-11-05

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

050635980

ABSTRACT:
An active muffler for motor vehicle exhaust conduits comprises a pulse tracking sensor generating a signal input to an electronic control for actuating an acoustic transducer imposing cancellation pulses upon the sound pressure pulse train travelling through the conduit. The system includes a preconditioning circuit for reducing the crest factor of the waveform pulse train travelling through the exhaust conduit by introducing negative pressure pulses into the exhaust conduit. Preferably, a digitally controlled one bit injector includes a fluid outlet in communication with the exhaust conduit and an inlet in communication with a vacuum source such as the intake manifold of the motor vehicle engine. Accordingly, the amplifier and the transducer of the acoustic actuator can be substantially downsized for employment in mass produced motor vehicles.

REFERENCES:
patent: 4153815 (1979-05-01), Chaplin et al.
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4480333 (1984-10-01), Ross
patent: 4669122 (1987-05-01), Swinbanks
patent: 4677676 (1987-06-01), Eriksson
patent: 4677677 (1987-06-01), Eriksson
patent: 4736431 (1988-04-01), Allie et al.
patent: 4783817 (1988-11-01), Hamada et al.
patent: 4805733 (1989-02-01), Kato et al.
patent: 4815139 (1989-03-01), Eriksson et al.
patent: 4837834 (1989-06-01), Allie
patent: 4876722 (1989-10-01), Dekker et al.
patent: 4878188 (1989-10-01), Ziegler, Jr.

Affiliated with

Also associated with

Rating

Active noise control system with two stage conditioning does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active noise control system with two stage conditioning, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active noise control system with two stage conditioning will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-504263