PCB-TERMINAL Video Path
Figure 5-1illustrates the Video Signal Path on the PCB- TERMINAL. TheAV-Switch circuitry has not changed, IC2L00 and IC2K00 are the same ICs used in the V21 chassis.
The 3DYC Motion Adaptive Come Filter provides a clean separation of luminance (Y) and chroma (C) sig- nals.
The Main and Sub Decoders are new, generic #TA12440AF. Their functions include:
•Converting NTSC to YPbPr.
•Sync Separation
•Detecting signal format (480i, 480p, etc.)
•Converting RGB to YPbPr.
The Component Switch ICs are also new, generic # MM1519XQ. There are two Component Switch ICs on PCB-TERMINAL, and a third one on PCB-SIG- NAL, not shown in Figure 5-1.
IC2A00 selects the Main and Sub picture sources from:
•Main Decoder output
•External Comp-1 Input
•External Comp-2 input
IC2B00 selects the Main and Sub picture sources from:
•The outputs of IC2A00
•The External DTV Inputs
•The VGA Input
The VGA Input cannot be selected as the Sub picture source.
