Reproducing waveform correction circuit for optical information

Details Reproducing waveform correction circuit for optical information Reproducing waveform correction circuit for optical information

1995-05-18

1996-10-29

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369106, 369 59, 369 4441, 360 39, 360 721, G11B 700

Patent

active

055703356

ABSTRACT:
According to an aspect, to realize a transient correction circuit capable of performing a high-speed operation without being affected by low-frequency noise and allow to remove only the low-frequency noise without changing a reproducing waveform, an output from a HPF for removing the low-frequency noise of a reproduced signal is supplied to a waveform correction circuit for correcting the transient of the reproduced signal, which is generated by the HPF. The waveform correction circuit is constituted by a LPF, an adder for adding an output from the LPF and the output from the HPF, and a quantization circuit for quantizing an output from the adder. The HPF and the LPF have the same time constant. According to another aspect, to precisely compensate a DC component necessary for signal reproduction, which is lost by capacitive coupling, in reproduction of a signal recorded by high-density or high-transfer recording, the low-frequency component of the reproduced signal is removed by a HPF corresponding to a coupling capacitor. A comparison circuit compares an output from the HPF with a predetermined reference level by a comparator, thereby generating a binary output. A LPF performs time integration of the binary output through a gain adjustment circuit. An output whose sag is corrected is calculated by an operational amplifier according to the output from the LPF and the HPF.

REFERENCES:
patent: 3882540 (1975-05-01), Ottesen
patent: 5181195 (1993-01-01), Kume et al.
patent: 5267095 (1993-11-01), Hasegawa et al.
patent: 5450255 (1995-09-01), Arisaka
Chapter V of "Digital Communication Technology" pp. 158-161, Kimio Tanaka, Tokai Daigaku Shuppankai, Digital Technology Series 8, Dated Mar. 25, 1986 .

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