Moving-average notch filter

Details Moving-average notch filter Moving-average notch filter

1978-05-01

1980-11-04

Morrison, Malcolm A.

179 1D, H04R 302

Patent

active

042321921

ABSTRACT:
A moving-average notch filter with a well-defined phase characteristic for use in eliminating oscillation frequencies in a sound amplification system, wherein this moving-average filter is designed to have an output Y.sub.K in accordance with the system equation ##EQU1## where b.sub.1 are the weighting coefficients, X.sub.K-i are input samples, and K is a constant. This filter may be designed to have a linear phase characteristic. In one embodiment, the location of the notch in the frequency response of the filter may be made to automatically track the drift of an acoustic oscillation frequency.

REFERENCES:
patent: 3755749 (1973-08-01), Van Ryswyk et al.
patent: 3763333 (1973-10-01), Lichowski
patent: 4079199 (1978-03-01), Patronis, Jr.
patent: 4088835 (1978-05-01), Thurmond et al.
patent: 4091236 (1978-05-01), Chen
S. Freeny, "Special Purpose Hardware for Digital Filtering," Proc. IEEE, Apr. 1975, pp. 633-636.
J. Proakis, "Adaptive Digital Filters," IEEE Trans. Audio/Electro, Jun. 1970, pp. 195-200.

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