Equalization circuit

Details Equalization circuit Equalization circuit

1976-05-03

1978-01-31

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

179 1D, 330 51, 330151, H03F 136

Patent

active

RE0295299

ABSTRACT:
A frequency equalization circuit includes an active filter circuit. The filter circuit differentiates the input signal. A plurality of adjustable resistances are connected to the differentiator corresponding to a plurality of operating or frequency ranges. A switch selects one resistance in accordance with one selected operating range to connect the filter circuit to an amplifier.

REFERENCES:
patent: 2450818 (1948-10-01), Vermillion
patent: 2589133 (1952-03-01), Purington
patent: 2760011 (1956-08-01), Berry
patent: 2895111 (1959-07-01), Rothe
patent: 3026480 (1962-03-01), Usher
patent: 3336540 (1967-08-01), Kwartiroff et al.
patent: 3530394 (1970-09-01), Deluach
patent: 3660785 (1972-05-01), Hosokawa
patent: 3665345 (1972-05-01), Dolby
patent: 3794935 (1974-02-01), Tsuchna et al.
patent: 3818362 (1974-06-01), Van Sluys
Aikens et al., "Cut Butterworth Filter Phase Distortion", Electronic Design 24, Nov. 22, 1969, pp. 74-77.
Toshiba Review, Jan.-Feb. 1970, pp. 55-58.

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