Method of cross-checking data block identification signals of da

Details Method of cross-checking data block identification signals of da Method of cross-checking data block identification signals of da

1988-05-24

1990-06-05

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

360 53, G11B 509

Patent

active

049318853

ABSTRACT:
Data blocks recorded on oblique tracks on magnetic tape are preceded by synhronizing signals and block identification signals. The serial data identification signals are converted to 8-bit parallel form and then are split between an undelayed channel and a channel delayed by one data block. Under control of a sync detector the parallel data are made to correspond with data words and are then decoded for comparison of the block numbers. Since the block numbering is consecutive, the delayed decoded block number is incremented by one for comparison. When a positive comparison is obtained the block number of the delayed decoded signals is made available to identify the data block. A counter in a so called fly wheel circuit assures provision of a new block start signal if a synchronizing signal is missed and prevents the timing of the circuit from being put off by a false detection of a synchronizing signal. A block identification output appears only if its block number is in sequence.

REFERENCES:
patent: 3787815 (1974-01-01), Farr, Jr.
patent: 4016599 (1977-04-01), Sherer
patent: 4415938 (1983-11-01), Heitmann
patent: 4479217 (1984-10-01), Philippides
patent: 4556976 (1985-12-01), Howarth

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