Spindle servo circuit in high-speed optical disk reproducer
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United States of America Patent
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May 5, 1998
Grant Date -
N/A
app pub date -
Jul 15, 1996
filing date -
Oct 6, 1995
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Abstract
A spindle servo circuit in an optical disc reproducing apparatus operates with enhanced stability at disc rotation speeds substantially higher than normal. The spindle servo circuit includes a first phase comparator which compares the phases of a reference clock signal and a reproduced frame clock signal and outputs a phase difference signal. The spindle servo circuit also includes a first low pass filter for generating a revolution speed control signal for a spindle motor by low-pass filtering the phase difference signal. The revolution speed control signal is input to a motor driving means for driving revolution of a spindle motor, which in turn spins the optical disc. Optical signals are picked up off the disc and run through a high frequency amplifier for amplifying and wave-shaping to produce a reproduction data signal. A phase locked loop circuit generates a reproduced bit clock signal from the reproduced data signal during normal operation, and during high speed operation (above a predetermined speed) generates the reproduced bit clock signal corresponding to a previous state. Thereby, in the spindle servo control system for operating at higher than normal speed, according to the present invention, the servo control system can be maintained in a stable state by fixing the phase synchronous loop of an accurate servo control system at a predetermined high speed, to allow stable restoration of data when operating at high speed.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- SAMSUNG ELECTRONICS CO., LTD.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Sim, Tae-Hyeon | Seoul, KR | 6 | 23 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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