Method and apparatus for detecting tracking error

Details Method and apparatus for detecting tracking error Method and apparatus for detecting tracking error

1982-04-05

1985-07-23

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 2102, H04N 576

Patent

active

045312060

ABSTRACT:
An optical disc player including an automatic tracking control for causing a light spot projected on a rotating optical disc to trace spiral or concentric information tracks is disclosed. A tracking error is detected by a wobbling method in which the light spot is vibrated in accordance with a position modulating signal having a given frequency, an amplitude modulated component due to a positional modulation is derived from a reproduced RF signal by passing an envelope signal of the reproduced signal through a band pass filter having a center frequency equal to the frequency of the position modulating signal, a sampling pulse is produced in synchronism with the position modulating signal and the amplitude modulated signal is sampled by the sampling pulse to derive a tracking error. A phase difference between the amplitude modulating signal and the sampling pulse is detected and a phase of the sampling pulse is modulated in accordance with the detected phase difference in such a manner that the amplitude modulated component can be always sampled at its peak points.

REFERENCES:
patent: 4118735 (1978-10-01), Wilkinson
patent: 4232201 (1980-11-01), Canino
patent: 4310911 (1982-01-01), Fujishima

Affiliated with

Also associated with

Rating

Method and apparatus for detecting tracking error does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for detecting tracking error, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for detecting tracking error will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-637230