RIAA Equalizer circuit

Details RIAA Equalizer circuit RIAA Equalizer circuit

1982-08-16

1984-08-28

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330294, 330304, 333 28R, H03F 3191

Patent

active

044686277

ABSTRACT:
An equalizer circuit is provided which has a high D.C. stability without degrading the equalization characteristic. The equalizer circuit comprises an equalizer amplifier, an equalizer element, a direct current component detecting circuit, and a negative feedback circuit. The equalizer amplifier amplifies an input signal of the equalizer circuit in accordance with RIAA equalization characteristic. The output of the equalizer amplifier is applied to the equalizer element which has an impedance corresponding to an inversed RIAA equalization characteristic. The output from the equalizer element, which is not subject to the RIAA equalization characteristic due to the provision of the equalizer element, is supplied to the direct current component detecting circuit in order to derive a direct current component from the output. The derived direct current component is negative fed-back to the equalizer amplifier as a negative feedback signal thereof.

REFERENCES:
patent: 4105945 (1978-08-01), Sano et al.
patent: 4117412 (1978-09-01), Holman

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