Low noise atip detection from an optical recording medium with w

Details Low noise atip detection from an optical recording medium with w Low noise atip detection from an optical recording medium with w

1996-01-16

1997-12-09

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4413, 369107, 369 48, 369 54, 369 59, G11B 700

Patent

active

056967527

ABSTRACT:
An apparatus for use in an optical system in which information is read from a recorded wobbled groove of an optical medium by detecting first and second portions of a return beam in first and second detectors producing detected signals, respectively, the apparatus comprising:
gain control circuit means coupled to the first and second detectors, respectively, and receiving the first and second detected signals therefrom;
the gain control circuit means being responsive to the detected signals for producing a summation signal which is a function of the sum of the two detected signals;
a first signal difference circuit coupled to the first and second detected signals for providing a difference signal; and
a second signal difference circuit responsive to the difference signal and the summation signal for producing a wobbled groove information signal.

REFERENCES:
patent: 5339302 (1994-08-01), Takahashi et al.
patent: 5363360 (1994-11-01), Fairchild
patent: 5506824 (1996-04-01), Fairchild et al.
patent: 5537373 (1996-07-01), Horikiri
patent: 5539724 (1996-07-01), Ohtomo

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