Disk reproduction apparatus capable of continuously varying a re

Details Disk reproduction apparatus capable of continuously varying a re Disk reproduction apparatus capable of continuously varying a re

1995-08-07

1996-06-11

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369 59, 360 102, 360 7713, G11B 700

Patent

active

055263399

ABSTRACT:
A pickup reads data recorded on a disk and outputs a current signal corresponding to the read data. An amplifier outputs the current signal as a voltage signal. A data slice circuit binarizes the voltage signal and converts it into an EFM signal. In response to the EFM signal, a PLL circuit generates a PLL clock signal in synchronization with a reproduction speed. When a reference speed or its two-times higher speed is selected as the reproduction speed, if the PLL clock signal is synchronized with the EFM signal, the frequency of the PLL clock signal is proportionate to the reproduction speed. In response to the PLL clock signal, the data slice circuit controls the frequency band of a reference voltage in accordance with the reproduction speed, and outputs the EFM signal. A data processing circuit demodulates the EFM signal and removes a jitter from the demodulated signal in response to the PLL clock signal. The data processing circuit also corrects an error of data corresponding to the demodulated signal in response to the PLL clock signal, and outputs audio data.

REFERENCES:
patent: 3845500 (1974-10-01), Hart
patent: 4255768 (1981-03-01), Kubota
patent: 5140580 (1992-08-01), Ohara et al.
patent: 5345434 (1994-09-01), Ide et al.
patent: 5353270 (1994-10-01), Imura
patent: 5359585 (1994-10-01), Tanoue et al.
patent: 5410527 (1995-04-01), Ashinuma
patent: 5418770 (1995-05-01), Ide et al.
Patent Abstracts of Japan, vol. 12, No. 16 (P-656), Jan. 19, 1988, JP 62 172567, Jul. 29, 1987.

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