Reproducing rate control apparatus for optical disk

Details Reproducing rate control apparatus for optical disk Reproducing rate control apparatus for optical disk

1995-11-07

1997-02-11

Epps, Georgia Y.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 54, 369 60, G11B 509

Patent

active

056028121

ABSTRACT:
A reproducing rate control apparatus for an optical disk includes a synchronizing clock generating unit which generates a synchronizing clock pulse with a phase locked to a phase of a digital reproduction signal. A signal processing unit generates a demodulated data signal from the digital reproduction signal in accordance with the synchronizing clock pulse, wherein the demodulated data signal is written to a memory in accordance with the synchronizing clock pulse, the demodulated data signal is read from the memory in accordance with a read reference clock pulse, and the read demodulated data signal is processed through an error correction so that a processed demodulated data signal is output. A frequency detecting unit detects whether the frequency of the synchronizing clock pulse is within a predetermined range of frequencies centered at a standard frequency. A switching unit selectively outputs one of a first read-reference clock pulse having an initial frequency and a second read-reference clock pulse having a second frequency to the signal processing unit in accordance with a result of the detection by the frequency detecting unit.

REFERENCES:
patent: 4631714 (1986-12-01), Kahlman et al.
patent: 5444687 (1995-08-01), Okumura
patent: 5463607 (1995-10-01), Roth et al.

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