Block error detector

Details Block error detector Block error detector

1990-06-07

1993-04-13

Baker, Stephen M.

Excavating

371 31, G11B 2018

Patent

active

052028909

ABSTRACT:
A train of data blocks, each carrying digital data and ID data are produced from a reading head as a tape passes the cylinder. A memory having a plurality of sections is provided, and a plurality of counters are provided correspondingly to the sections. The digital data are stored in a memory section identified by the ID data. Each time the digital data for one block is stored in a section in the memory, a counter corresponding to that section is incremented, and each time the digital data for one block is read out from a section in the memory, a counter corresponding to that section is decremented. Thus, as long as counter repeats "0" and "1", the data block is properly stored and properly read. However, if any one of the counters shows a number other than "0" and "1", it is understood that the writing or reading has been carried out twice in a row for the same section in the memory. Thus, an error in the ID data can be detected.

REFERENCES:
patent: 4329708 (1982-05-01), Yamamoto et al.
patent: 4742519 (1988-05-01), Abe et al.
"Replay of Digital Video Recordings at Non-Standard Tape Speeds", Wilkinson et al., 13th Int. TV Symposium, May 28, 1983, pp. 409-422.

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