Digital data transmission system with modified NRZI

Details Digital data transmission system with modified NRZI Digital data transmission system with modified NRZI

1983-02-02

1985-10-08

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

G11B 509

Patent

active

045463930

ABSTRACT:
A method and apparatus for digital magnetic recording of data in which digital data is recorded on a magnetic recording medium after being demodulated by the NRZI (Non-Return-to-Zero Inverted) system and read thereoutof timed to magnetic flux reversal caused by the recorded data on the recording medium. The digital data is encoded in a predetermined manner before the NRZI modulation so that at least part of "false" bits contained in the digital data is converted into "true" bits, resulting in an increase in the number of "true" bits. The encoded data is written into the recording medium after the NRZI modulation. In the event of reproduction of the data from the recording medium, self-clocking occurs to generate a data readout timing. The increased number of "true" bits insures desirable self-clocking. The data read from the recording medium is decoded to the original digital data.

REFERENCES:
patent: 4234898 (1980-11-01), Katsuya et al.
patent: 4310860 (1982-01-01), Leiwer
patent: 4369472 (1983-01-01), Tanaka et al.

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