Information reproducing apparatus with variable digitizing thres

Details Information reproducing apparatus with variable digitizing thres Information reproducing apparatus with variable digitizing thres

1992-09-29

1994-10-25

Psitos, Aristotelis

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 48, G11B 700

Patent

active

053595858

ABSTRACT:
The present invention aims at preventing erroneous data reproduction even when the amplitude center of a signal of a data part read out from an optical disc is displaced. An information reproducing apparatus comprises read means for reading data stored in each of block units on an optical disc and outputting a read signal, digitizing means for digitizing the read signal by using a slice level, generating means for comparing the signal digitized by the digitizing means and clock signals output at predetermined intervals, thereby generating a charge width signal representing a phase difference between the digitized signal and the clock signals, while the data stored in a data storing portion of the block unit is read by the read means, and changing means for changing the slice level of the digitizing means on the basis of the charge width signal generated by the generating means.

REFERENCES:
patent: 4672596 (1987-06-01), Romeas et al.
patent: 4706236 (1987-11-01), Yoda
patent: 5105417 (1992-04-01), Matsueda et al.
patent: 5189650 (1993-02-01), Watanabe et al.
patent: 5204848 (1993-04-01), Cardero et al.
patent: 5237554 (1993-08-01), Senshu et al.

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