Sharp DV-500D Technical Manual page 24

DVD-Series
However....
Because of that ···
Rough Servo is needed at the start
There are many reproduction signal lengths.
DVD
CD
Measure the lengths of the minimum and maximum reproduction signals, then switch to PLL
operation after it almost reaches the targeted number of rotations (after getting in the cap
challenge of PLL)
Reproduction Signal
VCO
Reproduction Signal
3T ~ 14T T means 1 cycle of the channel clock. 3T means 3 times as long as
_
3T ~ 11T that.
Because the length of T is different even for the same 3T, pulse
lengths are different.
A CD is approximately 6 times as much as a DVD.
Starting
Rough Servo
If the disc rotates
at half speed...
No phase error comes out, so it is locked.
Cap Challenge of PLL is narrow
PLL Control
Measure the minimum pules
Measure the maximum pules
24
Locked