Sector mark detecting device for optical disk

Abstract

Abstract PURPOSE:To elevate the reliability of a sector mark detecting device through simple circuit constitution by deciding that a sector mark is inputted, when all the outputs of a matching circuit exceed simultaneously the threshold of a threshold circuit. CONSTITUTION:A signal train 11 that plural sector marks with different patterns are converted by a regeneration circuit is inputted to a shift register 1. Besides, a clock 12 capable of detecting the pattern of the signal train 11 is inputted and the signal train is sampled, and a first signal is shifted to the shift register rn. This signal is forwarded in turn, and it comes to a state that n-pieces of the signals are shifted in the register r1-rn. The signals of the registers r1-rn are inputted to the matching circuit 12 through a parallel output 13. When an input comes to be the signal of the previously determined pattern, the circuit 2 sends the corresponding pattern to the threshold circuit 3. The circuit 3 sends the output 30 only when the outputs of the circuit 2 exceed the threshold simultaneously.

Inventors

• 👤 Tadao Oiwa

Bibliographic Details