Circuit for discriminating pre-mastered pits and pre-mastered gr

Details Circuit for discriminating pre-mastered pits and pre-mastered gr Circuit for discriminating pre-mastered pits and pre-mastered gr

1995-03-21

1996-07-30

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 3692754, G11B 709

Patent

active

055419070

ABSTRACT:
A circuit for performing pre-mastered pit/pre-mastered groove discrimination on an optical disk while an optical pickup traces and traverses tracks. Output signals applied to the input terminal from light receiving elements are summed in an adder circuit and are then applied to first and second transistors. The output signal from the first transistor Is that obtained by envelope detecting the output signal of the adder circuit and is subtracted with the output signal of the second transistor in the subtracter circuit. Then the output signal of the subtracter is compared with a reference value Vref in a comparator circuit. The comparator's output signal according to the result of comparison Is applied to a retrigger monostable multivibrator, which generates an output signal according to the result of pre-mastered pit/pre-mastered groove discrimination. Thus a pre-mastered pit/pre-mastered groove discrimination can be performed with accuracy even while the light pickup traverses pre-mastered pits and pre-mastered grooves.

REFERENCES:
patent: 4712206 (1987-12-01), Kanda
patent: 4879707 (1989-11-01), Getreuer

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