Adaptive removal of resonance-induced noise

Details Adaptive removal of resonance-induced noise Adaptive removal of resonance-induced noise

1997-04-25

1999-09-28

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

381 942, 381 718, 36472419, 3647242, H03G 500

Patent

active

059600918

ABSTRACT:
Noise is removed from the digitized output of a sensor, subject to undesired resonance, even when the resonant frequency is unknown or drifts, with sufficiently low phase delay for the sensor to be used in closed-loop control. A very narrow notch filter which removes the resonance-induced noise is recursive (IIR) and therefore has a low phase delay. However, the apparatus which determines the center frequency of the notch filter is non-recursive, and therefore stable. It includes a tunable FIR filter which tracks the same resonance that we wish the IIR filter to remove. Tuning the FIR filter to minimize the output of the FIR filter therefore tunes the notch frequency to align with the resonant frequency. The tuning parameter which adaptively produces this result is suitably scaled and biased, and is applied to the IIR filter.

REFERENCES:
patent: 5491725 (1996-02-01), White
patent: 5576976 (1996-11-01), White
Widrow and Stearns, Adaptive Signal Processing, pp. 250-253, 1985.

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