TRACKING CONTROLLER

PURPOSE:To securely and automatically detect a tracking position by using the value of a tracking error signal at the pole of the sum of the quantity of reflected light as a tracking position. CONSTITUTION:A digitized reflected light quantity sum signal TSq is inputted to the phase shifter consistin...

Full description

Saved in:
Bibliographic Details
Main Authors EDAHIRO YASUAKI, WATANABE KATSUYA
Format Patent
LanguageEnglish
Published 17.07.1991
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
Online AccessGet full text

Cover

More Information
Summary:PURPOSE:To securely and automatically detect a tracking position by using the value of a tracking error signal at the pole of the sum of the quantity of reflected light as a tracking position. CONSTITUTION:A digitized reflected light quantity sum signal TSq is inputted to the phase shifter consisting of delay devices 403-406, multipliers 411-417 which have specific coefficients, and an adder 42 to obtain an output (TShq) which is shifted in phase by -90 deg.. Then the output TShq is inputted to a low-pass filter 43 to remove high frequency noises and then an output Un and an output Un-1 which is delayed by a delay device 407 are inputted to a computing element 45. Further, a digitized tracking error signal TEq is passed through delay devices 401-402 and a low-pass filter 44 and then an output Xn and an output xn-1 which is delayed by a delay device 408 are inputted to the computing element 45. The computing element 45 calculates (y) in an equation and outputs a tracking position signal.
Bibliography:Application Number: JP19890305419