Adaptive filter for electrical supply line noise

Details Adaptive filter for electrical supply line noise Adaptive filter for electrical supply line noise

1997-04-10

1998-06-16

Mai, Tan V.

Boots, shoes, and leggings

G06F 1710

Patent

active

057681660

ABSTRACT:
A filter system is provided to remove electrical supply line noise at a first frequency from an input signal to a medical monitor. An arithmetic unit produces an intermediate signal having a frequency component that corresponds to a difference between the first frequency and a reference frequency. A calculator determines the period of the intermediate signal and a signal converter produces a sinusoidal signal which has the period determined by the calculator. An adder produces a filter control signal having a value that represents the sum of the reference frequency and the frequency of the intermediate signal. A notch filter is employed to remove the electrical supply line noise from the input signal. The filter control signal tunes the notch filter to the first frequency of the electrical supply line noise.

REFERENCES:
patent: 4438504 (1984-03-01), Favin
patent: 5325204 (1994-06-01), Scarpa

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