Group coded recording data recovery system

Details Group coded recording data recovery system Group coded recording data recovery system

1978-11-24

1980-08-26

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 43, G11B 509

Patent

active

042198518

ABSTRACT:
This relates to a digital data recovery system for decoding group coded data bits stored on magnetic tape whereon a "1" is represented by a flux reversal and an "0" is represented by the absence of a flux reversal with no more than two successive zeros throughout the data record. Input logic detects transitions of input data and forwards this information to an envelope detector which determines if subsequent transitions represent valid data. The presence of valid data enables a data rate detector which determines the average data rate. An output sequencer determines when a decoded output data bit should be generated and its proper polarity.

REFERENCES:
patent: 3879752 (1975-04-01), Heidecker
patent: 4141494 (1979-02-01), Fisher

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