Active noise control

Details Active noise control Active noise control

1988-05-13

1989-10-24

Ng, Jin F.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, A61F 1102, H03B 2900

Patent

active

048767220

ABSTRACT:
An active noise control system for reducing the amount of noise propagated along a duct comprises a microphone mounted in the wall of the duct for detecting the noise, and an active antiphase noise source, such as a loudspeaker, which is mounted substantially in the center of the cross-section of the duct. A control circuit coupled between the microphone and the antiphase noise source includes an integrator having a specific transfer function, which improves the loop gain of the microphone/source loop at low frequencies, and secures stability by altering the phase.

REFERENCES:
patent: 4122303 (1978-10-01), Chaplin et al.
patent: 4490841 (1984-12-01), Chaplin et al.
patent: 4527282 (1985-07-01), Chaplin et al.
patent: 4566118 (1986-01-01), Chaplin et al.
patent: 4736431 (1988-04-01), Allie et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1593433