Non-integer sample delay active noise canceller

Details Non-integer sample delay active noise canceller Non-integer sample delay active noise canceller

1993-04-27

1995-02-07

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

367901, H04B 1500

Patent

active

053880803

ABSTRACT:
An active adaptive noise canceller that inserts delays into the weight update logic of an adaptive filter to keep the filter stable. The noise and residual noise are sensed and the respective sensor signals are digitized at a given sample rate for processing in the adaptive filter. To eliminate the need for high sample rates while maintaining flexibility in the frequency regions over which the adaptive filter is stable, the delay introduced into the weight update logic is a non-integer multiple of the sample period. The non-integer sample delay is obtained by a sample interpolation and decimation procedure.

REFERENCES:
patent: 3997772 (1976-12-01), Crochiere et al.
patent: 4038536 (1977-07-01), Feintuch
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 5117401 (1992-05-01), Feintuch
"An Adaptive Recursive LMS Filter," P. L. Feintuch, IEEE Proceedings, vol. 64, No. 11, Nov. 1976.

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