System for decoding data on a magnetic medium

Details System for decoding data on a magnetic medium System for decoding data on a magnetic medium

1978-06-05

1980-02-19

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

041897579

ABSTRACT:
A system for reading back data recorded as series of discrete regions of magnetization and including synchronizing data, in a magnetic medium, comprises a readback device generating read data pulses, the system further including a clock pulse generator comprising a clock pulse oscillator and circuitry for providing a Gray code signal at the output of the clock pulse generator. Read data pulse recording cicuitry connected to the readback device is responsive to data pulses and generates an output signal corresponding to the time of arrival of data pulses. An exclusive OR gate compares the output fom the clock pulse generator and the read data pulse circuitry, the output of the exclusive OR gate being connected to a negative AND gate, thereby providing a system clock based upon the clock pulse arriving at the OR gate nearest in time to a data pulse.

REFERENCES:
patent: 3865981 (1975-02-01), Welsh et al.
patent: 3944940 (1976-03-01), Desai
patent: 4008488 (1977-02-01), Osborne
patent: 4037257 (1977-07-01), Chari
patent: 4040022 (1977-08-01), Takii

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