Adaptive noise reduction method and device

Details Adaptive noise reduction method and device Adaptive noise reduction method and device

2003-08-01

2008-10-14

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

C381S071900, C381S094400, C708S322000

Reexamination Certificate

active

07436968

ABSTRACT:
An adaptive noise reduction method and apparatus capable of reducing efficiently variable period noise from a main input is provided. The pitch of a noise waveform to be reduced can be variable with a change in a period of motor noise occurring when the revolution period is changed by disc motor control of DVD-RAM, by revolution speed control of other motors, and revolution period change on starting a motor and the like. Therefore, the renewal of adaptive filter coefficient becomes almost unnecessary, thus allowing noise reduction to be performed without degrading a noise canceling effect.

REFERENCES:
patent: 5426704 (1995-06-01), Tamamura et al.
patent: 5602927 (1997-02-01), Tamamura et al.
patent: 5708637 (1998-01-01), Umemura et al.
patent: 6633894 (2003-10-01), Cole
patent: 61-288613 (1986-12-01), None
patent: 3-277009 (1991-12-01), None
patent: 5-40485 (1993-02-01), None
patent: 5-127679 (1993-05-01), None
patent: 6-35487 (1994-02-01), None
patent: 7-199962 (1995-08-01), None
patent: 11-176113 (1999-07-01), None
patent: 11-232802 (1999-08-01), None
patent: 11-232803 (1999-08-01), None
Microfilm of the specification and drawings annexed to the request of Japanese Utility Model Application No. 11315/1990 (Laid-open No. 103626/1991) Oct. 28, 1991.

Affiliated with

Also associated with

Rating

Adaptive noise reduction method and device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive noise reduction method and device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive noise reduction method and device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3991791