Clock reproducing apparatus and data reproducing apparatus utili

Details Clock reproducing apparatus and data reproducing apparatus utili Clock reproducing apparatus and data reproducing apparatus utili

1994-03-30

1996-06-11

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 65, G11B 509

Patent

active

055262007

ABSTRACT:
A clock reproducing apparatus is adapted for reproducing a data existing point clock signal by using a reproduction signal obtained from a magnetic disc on which clock patterns for clock reproduction are recorded in servo areas discretely provided independent of data recording area, which comprises: a voltage controlled oscillator operative to oscillate the data existing point clock signal; a sampling circuit for sampling the reproduction signal in synchronism with the data existing point clock signal; a phase information generator for weighting-adding plural sample values before and after a reference sample value corresponding to the peak of a reproduced isolated waveform of the clock pattern to thereby generate phase information indicating a phase difference between the data existing point clock signal and a reproduction signal of the clock pattern; and a control voltage converter for converting phase information generated by the phase information generator to a control voltage for controlling the voltage controlled oscillator. Moreover, the clock reproducing apparatus further comprises a phase synchronization loop control circuit adapted to generate a phase comparison timing signal for allowing a sample value after a predetermined data existing point clock time from occurrence time of a signal which detects a unique pattern for recognizing an approximate existing time of the clock pattern. In addition, when there is employed a configuration to detect data in synchronism with the data existing point clock signal, a data recording apparatus is provided.

REFERENCES:
patent: 5216554 (1993-06-01), Schneider
patent: 5282185 (1994-01-01), Mori et al.
patent: 5311178 (1994-05-01), Pan et al.
patent: 5327298 (1994-07-01), Ottesen et al.
patent: 5341249 (1994-08-01), Abbott et al.
patent: 5377178 (1994-12-01), Saito et al.
patent: 5388090 (1995-02-01), Hoshino et al.
patent: 5406427 (1995-04-01), Shimoda

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