Vizio P50HDM - 50" Plasma Panel Service Manual page 35

Figure 8-9 Analog Input Port
The Analog Front End provides the capability to capture 16 analog video inputs which can be
a combination of Composite (CVBS), S-Video (SY, SC), YPrPb (Y, Pr, Pb) or RGB (R, G, B).
The Analog Source Selectors are responsible for switching the desired analog inputs to the
ADCs for digitization. There are two types of switching required: Channel Selection, Fast
Blank Switching.
Digital Front End (Digital Processing after AFE)
The DFE consists of 3 channels that can support the following Fixed-position formats:
Channels 1, 2 and 3 can be either R,G,B, or Y,U,V or 2 channels of Y and C or one channel of
CVBS. The DFE performs Digital Clamp Loop Control for each channel, AGC Control, Color
Conversion, Chroma Downscaling and 4fSC re-sampling. The Input to the DFE is 10 bit
40MHz Data. The Output is 4fsc Sampled CVBS, Y, C or YUV or just 10 bit CVBS.
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