Apparatus and method for detective a sync pattern and an address

Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing

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369 58, 369 47, 369 50, 360 51, G11B 700

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active

056967454

ABSTRACT:
A disk apparatus for reproducing pulse width modulation (PWM) data from a disk is disclosed. A first sync pattern detector compares data DTLE with a first sync pattern. A second sync pattern detector compares data DTTE with a second sync pattern. A first signal generator stops the detecting operation of the first detector when the first detector has detected the first sync pattern from the data DTLE. A second signal generator stops the detecting operation of the second detector when the second detector has detected the second sync pattern from the data DTTE. A first time check circuit restarts the detecting operation of the first detector when the first sync pattern has been detected first and the second sync pattern is not detected within a predetermined period of time. A second time check circuit restarts the detecting operation of the second detector when the second sync pattern has been detected first and the first sync pattern is not detected within a predetermined period of time.

REFERENCES:
patent: 150351 (1874-09-01), Ohno et al.
patent: 383171 (1888-01-01), Mizokami et al.
patent: 866692 (1907-09-01), Saito et al.

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