Circuit arrangement for correcting frequency response in accorda

Details Circuit arrangement for correcting frequency response in accorda Circuit arrangement for correcting frequency response in accorda

1984-03-08

1985-12-17

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

333 28R, G11B 545, G11B 502

Patent

active

045595690

ABSTRACT:
In a circuit arrangement for automatically correcting frequency response so as to set a desired frequency response in view of a frequency response of a sound field, a frequency response control circuit is improved such that precise level control at a number of bands is effected with a simple structure. A microcomputer is used to determine the difference between a desired frequency response curve and a frequency response curve obtained by measuring the sound pressure level in a sound field, to which pink noise or the like is emitted through the frequency response control circuit, so as to produce a control signal used in the frequency response control circuit to give a desired frequency response to an audio signal. The frequency response control circuit comprises an amplifier, a plurality of resonance circuits corresponding to the bands, a plurality of variable resistor circuits each including a parallel circuit of a plurality of series circuits of a resistor and an analog switch; and an interface circuit responsive to serial data of the control signal from the microcomputer for controlling the analog switches.

REFERENCES:
patent: 4340780 (1982-07-01), Odlen
Audio Engineering Society Preprint, No. 1680 (E-3), presented at the 67th Convention, Oct. 31,-Nov. 3, 1980, pp. 1-16, New York, US, R. W. Adams: "An Automatic Equalizer/Analyzer".

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