Track detection circuit for optical disc playback apparatus

Details Track detection circuit for optical disc playback apparatus Track detection circuit for optical disc playback apparatus

1997-10-31

1998-12-29

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4428, 369 4432, G11B 700

Patent

active

058547819

ABSTRACT:
Bottom detection circuit (5) detects the bottom of an RF signal from an addition circuit (3). The output signal of bottom detection circuit (5) is converted into a digital signal with A/D conversion circuit (10) to obtain maximum and minimum values using maximum value detection circuit (12) and minimum value detection circuit (13). The maximum and minimum values are applied to an arithmetic processing circuit (14) and a reference value is calculated based on that minimum value or maximum value. The reference value is held with hold circuit (15) and then converted into an analog signal with D/A conversion circuit (16). During track jumping, the output signal of bottom detection circuit (5) is compared with a reference voltage Vref corresponding to the reference value with comparison circuit (17) to obtain an output signal that corresponds to the presence or absence of a track. In this manner, track detection based on the bottom detection output of an RF signal is not affected by scratches or the like on an optical disc, and accurate track detection is possible. Tracks are detected using the peak detection output when only the peak detection output of the RF signal is unaffected by the presence of scratches or the like on the optical disc.

REFERENCES:
patent: 5046058 (1991-09-01), Shimonou
patent: 5532990 (1996-07-01), Koyama et al.

Affiliated with

Also associated with

Rating

Track detection circuit for optical disc playback apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Track detection circuit for optical disc playback apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Track detection circuit for optical disc playback apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1428718