Reducing amplitude variations of optical disk readback signals a

Details Reducing amplitude variations of optical disk readback signals a Reducing amplitude variations of optical disk readback signals a

1990-04-20

1992-08-11

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 4426, G11B 1722, G11B 700

Patent

active

051385945

ABSTRACT:
An optical disk recorder includes disk reflectance calibration means for measuring variations in disk reflectance over the recording area of the disk. Correction factors based on measured reflectance for adjusting sensed signal level and gain reduce the effects of varying reflectance on the sensed signal. In a preferred embodiment, the sensed signal is employed as a signal in quadrature to a tracking error signal for ensuring reliable track counting in a track seeking operation. In a grooved medium, reflectance is calibrated for both grooves and mesas between the grooves.

REFERENCES:
patent: 4205338 (1980-05-01), Schaeter
patent: 4286318 (1981-08-01), Immink et al.
patent: 4527263 (1985-07-01), Nakagawa
patent: 4611317 (1986-09-01), Takeuchi et al.
patent: 4700334 (1987-10-01), Shinkai
patent: 4751693 (1988-06-01), Yoshimaru
patent: 4785441 (1988-11-01), Tanaka et al.
patent: 4788674 (1988-11-01), Deguchi et al.
patent: 4907212 (1990-03-01), Pharris et al.
patent: 4914725 (1990-04-01), Belser et al.
patent: 5038333 (1991-08-01), Chow et al.

Affiliated with

Also associated with

Rating

Reducing amplitude variations of optical disk readback signals a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reducing amplitude variations of optical disk readback signals a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reducing amplitude variations of optical disk readback signals a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-352211