Automatic character skew and spacing checking network

Details Automatic character skew and spacing checking network Automatic character skew and spacing checking network

1975-01-06

1976-02-10

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Electronically correcting phasing errors between related...

360 51, G11B 1502

Patent

active

039381820

ABSTRACT:
A network is disclosed for automatically checking the skew and character spacing of digital tape drive systems to indicate out-of-tolerance conditions of those parameters. The network enables a tape drive to check its own recording accuracy as well as that of tapes recorded on other drives. In operation, the first detected pulse of each character triggers a monostable multi-vibrator which locks out further data pulses and initiates a window pulse equal in length to the maximum permissible skew. At the end of the window pulse data pulses may again be received. If a pulse is received after termination of the window pulse, the skew is determined to exceed specifications and a skew error indication is given by the illumination of a display light, for example. A similar circuit arrangement is provided for detecting character spacing which is less than the minimum required for unambiguous data reproduction.

REFERENCES:
patent: 3710361 (1973-01-01), Sonberg
patent: 3792436 (1974-02-01), DeVoy et al.
patent: 3812531 (1974-05-01), Hall
patent: 3821798 (1974-06-01), Cannon
patent: 3864735 (1975-02-01), Davis et al.

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