Optical disc device

Details Optical disc device Optical disc device

1996-09-18

1998-01-20

Dinh, Tan

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369124, G11B 700

Patent

active

057107505

ABSTRACT:
An optical disc device is equipped with a high-pass filter for removing a low-frequency noise in a played-back signal, an adder for adding the output signal of the high-pass filter and a correction signal as a low frequency component lost from the played-back data at the noise removal, a first comparator for binarizing the output signal of the adder, and a low-pass filter, having a frequency characteristic complementary to that of the high-pass filter, for suppressing a high frequency component of the output signal of the first comparator to generate the correction signal. In addition, a second comparator for binarizing the output signal of the adder taking a slice level as a reference and outputting played-back data and a controller for varying the slice level and/or a direct current level of the output signal of the adder so that a duty ratio of the played-back data becomes a prescribed value are provided. Thus, the influence of low frequency noise can then be effectively avoided and high-density recorded data can he surely played-back even when the d.c. level of the played-back signal fluctuates due to variations in the laser power.

REFERENCES:
patent: 5497361 (1996-03-01), Mita et al.
patent: 5548570 (1996-08-01), Hirajima et al.
patent: 5570335 (1996-10-01), Ogata et al.

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