Sony DVP-M35 Operation Manual page 34
Cd/dvd player
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Also See for DVP-M35:
- Service manual (105 pages) ,
- Operation manual (79 pages) ,
- Operating instructions manual (50 pages)
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The Servo DSP IC provides
the following
control in the tracking
servo system.
(a) Tracking
gain adjustment
The gain of intemal digital filter of IC is automatically
adjusted so that the tracking
servo loop gain becomes
optimum.
Consequently,
the optimum
gain for each disc to be played can be attained, besides
correction
of gain variations
in tracking
actuator (coil) and optical pickup sensor
(photodiode
for tracking
and focusing).
(b) Tracking jump control
At one track jump or N track jump (jumping many tracks) in asearching,
generation
of tracking pulses, control of tracking brake, and measurement
of tracking jumps
are executed.
The TE (Tracking Error) signal input to IC506 (Servo DSP CXD8730R)
is low frequency
boosted,
high frequency
phase compensated,
and gain adjusted by the internal
digital
filter, and output from DSP by the DSP internal
D/A converter
as the tracking
drive
signal (T OUT _P).
The T OUT signal is input to the IC (IC363:BA5981)
for
driving the tracking
actuator (coil).
In IC363, voltage amplification,
voltage conversion,
and current amplification
are carded
out to BTL drive the tracking actuator
(coil) using the output signals of IC363 (DVD
TRK + _)P, DVD TRK - (_P).
The tracking zero-cross timing is generated
by IC501 (1JPC393) and IC508 (NJM3404).
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