Block pattern detection circuitry

Details Block pattern detection circuitry Block pattern detection circuitry

1986-11-21

1988-07-19

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

360 50, G11B 2012

Patent

active

047589060

ABSTRACT:
Block pattern detection circuitry for the read subsystem of a streaming tape drive system comprises a state machine, a pattern decoder, a tape mark detector, a block/gap filter, a block/gap meter, a verify count section, and a block read/verify section. The incorporation of a hardware state machine within the block detect circuitry permits the application of historical detect data in the interpretation of present detect data. This provides more certain pattern recognitions. Also, state data is fed back to the block/gap filter allowing precise block boundary triggers which are used by position capture circuitry and the drive controller to effect more precise re-try positioning. The use of the block/gap filter increases the detect circuitry's immunity to noise. The advantage is enhanced where the block/gap filter uses stochastic thresholding, which is also advantageously employed by the tape mark detector.

REFERENCES:
patent: 3588855 (1971-06-01), Scully
patent: 3863265 (1975-01-01), Klumpp
patent: 3994014 (1976-11-01), Burgiss
patent: 4176380 (1979-11-01), Koski et al.
patent: 4321632 (1982-03-01), Leis et al.
patent: 4356566 (1982-10-01), Wada et al.
patent: 4618898 (1986-10-01), Young et al.

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