Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-07-18
1998-12-08
Swann, Tod R.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 59, G11B 700
Patent
active
058480480
ABSTRACT:
An optical disc reproducing apparatus capable of detecting data with a high precision without being affected by a low frequency component of a modulation code, comprising a high-pass filter for cutting off the low frequency component contained in the reproduced signal by a predetermined cut-off frequency, an envelope detecting means for detecting the envelope of said reproduced signal, a digitizing means for digitizing said reproduced signal, a gain controlling means for controlling the gain of said digital signal, a low-pass filter for cutting off the high frequency component contained in said gain-controlled digital signal by said cut-off frequency and generating a feedback signal, and an adding means for adding said reproduced signal and said feedback signal and outputting the same as an added signal to said digitizing means.
REFERENCES:
patent: 5710750 (1998-01-01), Tachibana
Chu Kim-Kwok
Frommer William S.
Sony Corporation
Swann Tod R.
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