Data recovery system for information recording media

Details Data recovery system for information recording media Data recovery system for information recording media

1990-12-05

1994-03-08

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 45, G11B 509

Patent

active

052932753

ABSTRACT:
A floppy disk recording data regeneration system having a voltage-controlled delay circuit, voltage-controlled data phase shifting circuit and a loop filter made up of a first-stage low-pass filter with a first cut-off frequency, and a second-stage low-pass filter with a second cut-off frequency lower than the first cut-off frequency. The output voltage of the second-stage low-pass filter drives the voltage-controlled data phase shifting circuit, and the output voltage of the first-stage low-pass filter drives the voltage-controlled delay circuit. The amount of delay of the oscillation output pulse is adjusted by the voltage-controlled delay circuit to suppress the occurrence of read errors in the event of peak shifts. In the event of a wow and flutter fluctuation, the amount of shift in the phase of the read data signal pulse is finely adjusted to suppress the occurrence of read errors in subsequent stages. In a data recovery system having this type of phase correction circuit, correction is also performed in the event of jitter due to the occurrence of power source fluctuations, and, therefore, countermeasures for suppressing power source fluctuations can be implemented relatively easily.

REFERENCES:
patent: 3900890 (1975-08-01), Eibner
patent: 4376268 (1983-03-01), Moriya et al.
patent: 4567448 (1986-01-01), Ikeda
patent: 4811125 (1989-03-01), Sengoku
patent: 4837643 (1989-06-01), Tierney, III

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