Pioneer DVL-K88, Service Manual

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11
DV-505, DVL-909, DV-S9
2.1.3 Analog Video Signal Processing Block
The video signals output from the built-in 10-bit DA converter of
the M65677FP pass through a low-pass filter and amplifier, and are
output from the DVD MAIN Assy and sent to the VOUT Assy.
In the VOUT Assy, analog noise-reduction processing having three
levels (OFF, low, and high) is initially applied only to the Y signal.
This analog noise reduction is the same as that performed by
conventional laser-disc players. The register port output in serial
communication that the PD0259A receives from the system-control
computer is used as the control signal for analog noise reduction.
After analog noise reduction, a CVBS signal is generated by
composing the Y and C signals (no clamping is performed for the C
signal). The timing pulse BF to be used for pedestal clamping is
supplied from the PD0259A. This signal is adjusted within the
PD0259A so that it provides the timing for the burst portions of the
output video signals.
IC801
MB86371
(AV1)
IC901
PD0259A
(DNR)
IC951
M65677FP
NTSC
ENCODER
LPF
Amp.
H
V
FLD
CLK
V DATA V DATA
H
V
CLK
Cb
µ
-COM
Cb
Cr
Y
Y
C
CVBS
V OUT ASSY DVD MAIN ASSY
ANR2 ANR1 BF
IC952
M65677FP
NTSC
ENCODER
LPF
Amp.
Cr
LPF
CLAMP
CLAMP
CLAMP
CLAMP
CLAMP
Analog
NR
Amp.
Y
LPF
Amp.
C
µ
-COM
4M DRAM
×
2