Filter assembly for eliminating mains disturbances

Details Filter assembly for eliminating mains disturbances Filter assembly for eliminating mains disturbances

1982-06-17

1985-04-16

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307520, 307522, 307352, 307529, H03B 104

Patent

active

045118477

ABSTRACT:
The invention relates to a filter assembly for eliminating mains disturbances from an electric signal, especially noise type of bioelectric signal, for analyzing the signal characterizing quantities, particularly amplitude or intensity. The invention includes a sample and hold circuit for providing analogous discrete time signals from the signal to be analyzed by employing doubled mains frequency as a sampling frequency, a summer for providing signals Y.sub.n =1/2(X.sub.n +X.sub.n-1), wherein X.sub.n is a number n sample, from successive analogous samples for filtering away the mains frequency and its odd harmonic frequencies, as well as a high-pass filter for said signals Y.sub.n for filtering away the even harmonic frequencies of mains frequency.

REFERENCES:
patent: 4017812 (1977-04-01), Bonnefoy-Claudet et al.

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