Variable frequency-response equalizer

Details Variable frequency-response equalizer Variable frequency-response equalizer

1981-11-12

1984-05-01

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 67, G11B 545

Patent

active

044464932

ABSTRACT:
Disclosed is a variable frequency-response equalizer which includes an amplifying circuit having a predetermined equalizing frequency characteristic, a time constant changing circuit for changing a time constant regarding the high frequency response of a playback output signal produced from the amplifying circuit, and a level sensor for determining a change of the time constant caused by the time constant changing circuit according to the level of the signal amplified by the amplifying circuit. The magnitude of the time constant is reduced when the level of the signal amplified becomes lower than a predetermined value.

REFERENCES:
patent: 3631365 (1971-10-01), Dolby
patent: 4038692 (1977-07-01), Umeda et al.
patent: 4263624 (1981-04-01), Gundry
patent: 4297730 (1981-10-01), Kadowaki et al.

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