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SERVICE MANUAL
4-5. DEMUX & CPU
A Transport Demultiplexing
transport layer functions, the DEMUX's principle operation is straight forward:
4-5-1. A stream of data packed in transport layer format 188 bytes per packet
enters the DEMUX IC through its channel decoder interface.
The DEMUX system or IC detects the sync byte, which is the first byte of
every transport packet header. Once in sync, byte, byte-aligned data is
posted to the next stage of processing.
4-5-2. The DEMUX parses the incoming data using its Packet ID(PID) processor.
Upon user programming the DEMUX extracts the user selected program,
audio, and video Packetized Elementary Stream(PES) data, Program
Specific Information(PSI),
4-5-3. The selected audio and video PES layer encoded data stream is output
through the DEMUX.
4-6. A/V DEC O D I N G
Video Compression & Decompression
for compressed digital video.
Encoders designed to work within the confines of the standard compress video
information, and decoders decompress it. The MPEG algorithms for video
compression and decompression
criteria.
4-6-1. Data rates are about 1 to 1.5Mbit/sec for MPEG-1 and up to 15Mbit/sec
for MPEG-2. The MPEG-2 A/V Decoder used in DRX100 is capable of
supporting data rates up to 15Mbits/sec.
4-6-2. Resolution are about 352 pixels horizontal up to about 288 lines vertical
for MPEG-1 and 720 x 576 for MPEG-2(main profile). The A/V Decoder used
in DRX100 is capable of resolution up to 720 x 576 for either MPEG-1 or
MPEG-2.
S-00-005(96.03.27)
integrates all audio, video, and data service MPEG-2
are flexible, but generally fit the following
REV.1
Service Information(SI),
Concepts The MPEG standards define a format
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