Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1999-09-30
2000-11-21
Huber, Paul W.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 59, 36912405, 36912414, G11B 509
Patent
active
061512826
ABSTRACT:
A clock matching apparatus for a data reproduction system includes a phase error detection unit which detects a phase error of a clock signal based on samples of a readout signal output by a sampler of the data reconstruction system. A phase-locked loop supplies a phase-matched clock signal to the sampler by compensating for the phase error detected by the phase error detection unit. The phase error detection unit includes an edge detection unit which detects a sampling instant for an edge sample among the samples of the readout signal. A difference unit generates a difference in timing phase between the edge sample and a sync level, the sync level being a reference signal level corresponding to a level of the readout signal at the sampling instants thereof and defined based on a partial-response waveform, the difference in the timing phase being output to the phase-locked loop as the detected phase error.
REFERENCES:
patent: 4637006 (1987-01-01), Bierhoff
patent: 5986987 (1999-11-01), Taguchi et al.
patent: 5995465 (1999-11-01), Hayashi et al.
Fujiwara Toru
Furuta Satoshi
Hamada Kenichi
Taguchi Masakazu
Fujitsu Limited
Huber Paul W.
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