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Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 146
Q523.1U LA
9.
9.6
PNX85xx
In this chassis, the PNX85xx is responsible for the audio/video
source decode functions and video improvement processing
on both digital and analog sources. It includes a multi-standard
digital video decoder for MPEG2, and a multi-standard analog
video decoder for support of PAL, NTSC, and SECAM
standards. Refer to diagram B04 for details.
9.6.1
Video Subsystem
Refer to figure “Video flow diagram” for a clarification of the
blocks that are used in this device.
Figure 9-12 PNX85xx video flow diagram
The Analog Video Front-End (AVFE) provides the interface to
external analog baseband video sources and IF inputs. It
supports the following inputs:
•
1fh - CVBS, Y/C, YPbPr, RGB.
•
2fh - YPbPr, RGB.
•
IF - low-IF, SSIF.
The Video Capture Pipe (VCP) is used to capture analog video
inputs and consists of a number of blocks:
•
The VCP-RX block that contains digital IF processing, a
Video Decoder, a 3D-combfilter, and a VBI-Data Capture
unit together with a number of smaller control functions.
•
The VCP-PSUD which allows VBI data, such Teletext and
Closed Captioning, to be stored in memory.
•
The VCP-PSUV which allows captured video data to be
stored in memory.
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