Group coded recording data recovery system

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

G - Physics

11

B

352/19.1

G11B 5/09 (2006.01) G11B 20/14 (2006.01)

Patent

CA 1143832

SPECIFICATION OF NICHOLAS S. LEMAK FOR GROUP CODED RECORDING DATA RECOVERY SYSTEM ABSTRACT OF THE DISCLOSURE This relates to a digital data recovery system for de- coding group coded data bits stored on magnetic tape whereon a "1" is represented by a flux reversal and an "0" is repre- sented 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 sub- sequent 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. 5202793

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