Amplitude sensitive three-level detector for derivative read bac

Details Amplitude sensitive three-level detector for derivative read bac Amplitude sensitive three-level detector for derivative read bac

1981-02-17

1982-08-24

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 67, G11B 509, G11B 502

Patent

active

043464114

ABSTRACT:
A system for reading information stored on a flexible magnetic disk is disclosed. The system involves an amplitude detector for detecting at predetermined times whether the amplitude of the read signal is positive, zero or negative. This system includes an amplifier for the differential raw data signal whose gain is variable in response to changes in the amplitude of the raw data signal which occur over a relatively long period. The output of the automatic gain control amplifier is an equalized differential signal applied to the detector and to a threshold generator which provides an output reference signal which is a predetermined percentage of the input signal, and which is capable of following relatively rapid changes in the amplitude of the input signal. A positive and negative comparator circuit continually compares the differential equalized data signal against the generated threshold reference signal. The outputs of these comparators are sampled at clock times established from a phase-locked loop which is synchronized by pulses derived from the peaks of the input data signal.

REFERENCES:
patent: 3581297 (1971-05-01), Behr et al.
patent: 3821716 (1974-06-01), Ghajar
patent: 4298898 (1981-11-01), Cardot

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