RF signal-compensated system for reading an optical disc player

Details RF signal-compensated system for reading an optical disc player RF signal-compensated system for reading an optical disc player

1992-10-27

1994-08-16

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4413, 369 4436, 369 58, 369109, 369124, G11B 700

Patent

active

053393023

ABSTRACT:
A reading system of an optical disc has a pregroove having a wobbled inside wall and pits for representing recorded data, and a pair of photodetector elements for detecting a spot of a laser beam reflected on the optical disc. The wobbled inside wall is modulated so as to represent absolute time. A differential amplifier is provided for deriving the difference between outputs of photodetector elements. A gain variable amplifier is provided for adjusting the level of one of the outputs to the level of the other output, so that the difference becomes zero.

REFERENCES:
patent: 4691308 (1987-09-01), Takagi et al.
patent: 4847824 (1989-07-01), Davie
patent: 5050151 (1991-09-01), Kurz

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