Intelligent envelope detector and method for gain control for PR

Details Intelligent envelope detector and method for gain control for PR Intelligent envelope detector and method for gain control for PR

1995-11-09

1998-01-13

Tran, Thang V.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 7708, 327 78, 327306, G11B 509

Patent

active

057085374

ABSTRACT:
A method and apparatus are provided for gain adjustment of a signal. A plurality of comparators compare the signal with a plurality of threshold values. An envelope detector coupled to the comparator includes a peak capture function for detecting the amplitude of the signal and a polarity memory for detecting polarity of the signal. A gain control function for setting a gain correction value is responsive to the peak capture function and the polarity memory. Features of the signal gain adjustment method and apparatus of the invention include an intelligent hold of the gain control over both thermal asperities and null gaps in the signal.

REFERENCES:
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patent: 5220466 (1993-06-01), Coker et al.
patent: 5233482 (1993-08-01), Galbraith et al.
patent: 5426541 (1995-06-01), Coker et al.
patent: 5438460 (1995-08-01), Coker et al.
patent: 5442492 (1995-08-01), Cunningham et al.

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