Apparatus for detecting a read error of an optical recording med

Details Apparatus for detecting a read error of an optical recording med Apparatus for detecting a read error of an optical recording med

1989-11-14

1992-08-11

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 59, 360 361, G11B 576

Patent

active

051385970

ABSTRACT:
An apparatus for detecting a read error of an optical recording medium is provided with a reading device which reads data recorded on a data track of an optical recording medium to thereby store the read data in memory therein. This apparatus includes a PLL circuit responsive to a read clock from the optical recording medium for generating a clock synchronized with the read clock, and address updating circuit for updating a write address of the memory to store the read data therein in synchronization with the output clock from said PLL circuit. Also, included are out-of-locking detection circuit for detecting the out-of-locked state of the PLL circuit in response to the read clock and the output clock from the PLL circuit, and address-updating suppression circuit responsive to a detection signal from the out-of-locking detection circuit for suppressing the address updating of the address updating circuit. When the PLL circuit is detected to be in an out-of-locked state, no read data is stored into the memory so that only noraml data is acquired in the memory at any time.

REFERENCES:
patent: 4672597 (1987-06-01), Yamazaki
patent: 4682318 (1987-07-01), Busby
patent: 4885735 (1989-12-01), Fukushima et al.

Affiliated with

Also associated with

Rating

Apparatus for detecting a read error of an optical recording med does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for detecting a read error of an optical recording med, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for detecting a read error of an optical recording med will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-352244