Pioneer DVL-909 Manuel d'entretien - Page 11

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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.

4M DRAM

V DATA

IC801

MB86371

PD0259A

(AV1)

FLD

CLK

-COM

V DATA

IC901

IC951

M65677FP

(DNR)

NTSC

ENCODER

CLK

IC952

M65677FP

NTSC

ENCODER

DV-505, DVL-909, DV-S9

Amp.

LPF

Amp.

LPF

Amp.

LPF

Amp.

LPF

DVD MAIN ASSY

CLAMP

Analog

CLAMP

V OUT ASSY

CVBS