Circuit for writing and reproducing a modulation signal onto wri

Details Circuit for writing and reproducing a modulation signal onto wri Circuit for writing and reproducing a modulation signal onto wri

1990-06-01

1993-02-23

Severin, David J.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

G11B 700

Patent

active

051896575

ABSTRACT:
A circuit capable of simply writing a specified modulation signal, for example, eight to fourteen modulated signals onto a writable optical disk, by utilizing rising and falling edges of the signal. The circuit includes a first pulse generator for generating a first write pulse upon each rising edge of the first format of modulation signal; a second pulse generator for generating a second write pulse upon each falling edge of the first format of modulation signal; a gating circuit for providing either one of the first and second pulses, in sequence of occurrence, to a laser power controller, so as to enable to write the first format of modulation signal onto the disk; a signal reproducing circuit for reproducing the first format of modulation signal retrieved from the disk into the original modulation signal; and a switching circuit for selecting either one of the second type of reproduced modulation signal and output of the signal reproducing circuit for a demodulating circuit. The circuit makes it possible to write an EFM signal by two successive write pulses, irrespectively of the length of logic high duration of the EFM signal.

REFERENCES:
patent: 2464667 (1949-03-01), Boosman et al.
patent: 4397042 (1983-08-01), Tsujii et al.
patent: 4497069 (1985-01-01), Fischer
patent: 4583211 (1986-04-01), Nishikawa et al.
patent: 4817077 (1989-03-01), Ono
patent: 4873680 (1989-10-01), Chung et al.
patent: 4901300 (1990-02-01), van der Zande et al.
"Modulation Systems for Digital Audio Discs with Optical Read Out"; Immink, IEEE Int'l Conf. on Acoustics and Signal Processing, Mar. 30-Apr. 1, 1981 pp. 587-589.

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