Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1994-12-06
1997-01-07
Edun, Muhammad N.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
369 50, 369 48, 360 48, 360 51, G11B 700
Patent
active
055924565
ABSTRACT:
There is an information reproducing apparatus having a first comparator for comparing a reproduction signal from an information recording medium such as a magnetooptical disc and a first reference signal, thereby binarizing the reproduction signal, a clock signal generating circuit for generating a clock signal from the signal binarized by the first comparator, and a synchronous circuit for synchronizing the binary signal by the clock signal. A phase comparator compares the phase of the binary signal and the phase of the output of the synchronous circuit, a charge/discharge circuit such as a charge pump circuit is driven by an output of the phase comparator, and a second comparator compares an output of the charge/discharge circuit and a second reference signal. The first reference signal is controlled by an output of the second comparator synchronously with the binary signal or the output of the synchronous circuit. The second reference signal changes interlockingly with a change in frequency of the clock signal forming circuit.
REFERENCES:
patent: 5204848 (1993-04-01), Cardero et al.
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patent: 5396479 (1995-03-01), Johann
The Transactions of the Institute of Electronics, Information and Comm. Engineers, vol. E74, No. 4, Apr. 1991 Tokyo, pp. 951-954, XP 000241319.
T. Maeda et al. "High speed, large capacity optical disk using pit-edge recording and MCAV method".
Patent Abstracts of Japan, vol. 12, No. 151 (P-699), May 11, 1988 & JP-A-62 267975 (Matsushita Electric Ind Co.) Nov. 20, 1987.
Ashinuma Takaaki
Miyashita Akira
Canon Kabushiki Kaisha
Edun Muhammad N.
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