Dynamic equalizing

Details Dynamic equalizing Dynamic equalizing

1982-06-14

1984-12-25

George, Keith E.

Electrical audio signal processing systems and devices

Including frequency control

Automatic tone control

381109, 333 28T, H03G 914

Patent

active

044908431

ABSTRACT:
An automatic dynamic equalization circuit has a potentiometer having a tap shunted by an active resonator circuit including a capacitor shunted by an active circuit presenting a high Q inductive reactance that is resonant at substantially 50 Hz and provides essentially no boost in the middle range of frequencies above 150 Hz with roll-off below about 45 Hz.

REFERENCES:
patent: 2144565 (1939-01-01), Dreisbach
patent: 2680232 (1954-06-01), Claras et al.
patent: 2812498 (1957-11-01), Hall
patent: 2900609 (1959-08-01), Estkowski
patent: 3313885 (1967-04-01), Aiken
patent: 4046960 (1977-09-01), Veale
patent: 4076959 (1978-02-01), Gilbert et al.
patent: 4220817 (1980-09-01), Kampmann
Newcomb, Jr. et al., "Practical Loudness: An Active Circuit Design Approach", Journal of the Audio Engineering Society, vol. 24, No. 1, Jan./Feb. 1976, pp. 32--35.
AIWA 3-Band Stereo Radio Cassette Recorder Service Manual for Model No. CS-880E,K; 7/81, pp. 1, 25, 26, and Schematic.
Holman and Kapman, "Loudness Compensation: Use and Abuse", Presented at Audio Engineering Society 58th Convention, Nov. 4-7, 1977, New York; Audio Engineering Society Preprint No. 1281(D-4).

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