PLO phase detector and corrector

Details PLO phase detector and corrector PLO phase detector and corrector

1975-07-07

1977-02-22

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

360 51, G11B 509

Patent

active

040094901

ABSTRACT:
Apparatus in a high-density disk storage controller for qualitatively testing circuits recovering self-clocking data, on-line and independently of any storage device. The ability of the data recovery apparatus, which is designed with broad-tolerance circuits and components, to recover a data pattern having predetermined and worst-case phase-shift or jitter is tested dynamically under microprocessor control. The test results are evaluated and apparatus in the data recovery circuits selectively positions a read strobe precisely in the center of the data window to compensate for variations of delay encountered in different combinations of the broad-parameter components.

REFERENCES:
patent: 3641534 (1972-02-01), Irwin
patent: 3864735 (1975-02-01), Deris et al.
patent: 3938184 (1976-02-01), Defrancesco

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