| 摘要 |
A servo-positioning system for controlling the positioning of a read-out light beam in an optical system which reads out digital information from a pre-recorded disc including a wobbling means for wobbling a read-out beam to traverse an information track of the disc, a photo detecting means for detecting the read-out beam reflected from the disc, a waveform arranging means for arranging the output of photo detecting means, an extracting means for extracting a clock signal component from the output of the waveform arranging means, a latch circuit for latching the output of the waveform arranging means synchronized with the output signal of the extracting means, a subtracting means for subtracting the output of the latch circuit from the output of the photo detecting means, to isolate the wobbling signal component from the output of the composite photo detecting means including an information component and a wobbling component. |
