Self-adjusting digital notch filter

Details Self-adjusting digital notch filter Self-adjusting digital notch filter

1975-03-25

1976-06-29

Morrison, Malcolm A.

Registers

Transfer mechanism

Traveling pawl

328167, 333 17R, 333 70R, 333 76, 343 77, G06F 1534, H03H 710

Patent

active

039671020

ABSTRACT:
Digital filter auto-adjustment to variations in input signals is achieved by normalizing the output of the second of two substantially identical series-connected digital filter stages and subtracting the normalized output of the second filter stage from its input to provide a measure of filter signal residue power. Deviations of the signal residue power from the preset limits of a signal residue power standard are detected and signals responsive thereto are used to appropriately adjust variable bandwidth constants in both filter stages.

REFERENCES:
patent: 3355668 (1967-11-01), Boensel et al.
patent: 3375451 (1968-03-01), Borelli et al.
patent: 3659212 (1972-04-01), Saliga
patent: 3867712 (1975-02-01), Harthill et al.
patent: 3868605 (1975-02-01), Poole

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