Filter adjustment apparatus and method

Details Filter adjustment apparatus and method Filter adjustment apparatus and method

1987-12-28

1989-03-14

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307520, 307556, H03B 104, H03K 500

Patent

active

048127736

ABSTRACT:
Filter adjustment apparatus for adjusting cut-off frequencies or dip frequencies, for example, may be adjusted to desired optimum properties, during application of an input signal of a constant frequency. The optimum filter adjustment data are found, based on data manifested when the level detected output of the filter output crosses a prescribed reference level whereby the filter adjustment operation is simplified and accuracy is improved with a simplified structure, and it is possible to achieve automatic adjustment of the filter characteristics.

REFERENCES:
patent: 3714588 (1973-01-01), Deboo et al.
patent: 3753159 (1973-08-01), Burwen
patent: 3978416 (1976-08-01), Sutphin, Jr.
patent: 3978420 (1976-08-01), Lane
patent: 4045731 (1977-08-01), Tokunou et al.
patent: 4207543 (1980-06-01), Izakson et al.
"Digital Control of Active Filter Characteristics", by J. J. Hill, 6-28-76, International Journal Electronics, vol. 41, No. 4, 405-410.
"Self-Tuning Active Low Pass Filter", by Tarasov et al., Instrument & Exp. Tech., vol. 22, No. 1, Jan.-Feb. 1979.
"Systems Applications for Voltage Controlled Active Filters", by Harvey, EEE, Oct. 1969.

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