Mitsubishi V19-V21, Tehnical Manual

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7-1
Chapter 7
Video/Color Circuitry
The above Simplified Block Diagram represents the
Video/Color circuitry in the V19/V21 chassis. The ana-
log section of the circuitry is similar to that in the V17
and V18 chassis.
• NTSC Signal Select – Selects the Main and
Sub Picture NTSC signal sources.
• 3DYC Comb Filter – Separates the lumi-
nance (Y) and chroma (C) signals when the
main source is NTSC composite video.
• Main and Sub Decoders – convert their
respective signals to the component format
(YCbCr).
• YCbCr Select circuitry – selects the YCbCr
main and sub picture signals.
• 2HDW (AMDP) circuitry – performs line
doubling, PIP/POP and display format signal
processing..
• Multi Component Processor (VCJ) – pro-
cesses the YCbCr signals and converts them
to the RGB format to drive the CRTs.
Only 480i signals are valid sources for PIP/POP signal
processing in the 2HDW circuitry. Therefore the PIP/
POP features are only possible when both the main and
sub picture signals are 480i format. 480p signals are
only processed in the 2HDW circuit when a display for-
mat change is selected.
Main picture 480p (with no display format change)
and 1080i signals are applied directly to the VCJ,
bypassing the 2HDW circuit.
The biggest change in the V19/V21 Video/Color cir-
cuitry is the addition of a DM Module. The circuitry in
the DM Module consists of:
• ATV/QAM Tuner and Demodulator.
• HD MPEG2 Decoder
• IEEE-1394 Interface
This enables the V19/V21 to receive and decode High
Definition broadcasts, and Digital Cable signals (when
not scrambled), without using a Set Top Box. The IEEE-
1394 interface enables single cable connection to 1394
compatible Digital Devices in a Home Theater System.