Reference Information; Terhnical Overview - Samsung DSB-S300G Service Manual

Reference Information

14.
14-1 Technical Overview
14-1-1 Transport stream
There are two kinds of multiplexing.The one is multiplexed program called PS(Program
Stream),which improved MPEG-1 system.
The another TS(Transport Stream) is multiplexed program in channel environment with error.
It is adequatable Digital Broadcast TV due to multiplexing multi program with one bit stream.
and add PPV(Pay Per View)functions to STB embedded CAS(Conditional Access System) program.
14-1-2 Demultiplex
Digital set-top boxes and digital TVs may require multiple program stream inputs,for example
cable/terrestrial/satellite TV.The transport stream multiplexor(TSMUX) is designed to route two input
transport streams independently to the on-chip PTI.
The TSMUX also supports input from an internal transport stream(software writable transport
stream)and allows the PTI output to be multiplexed to an output stream.
The multiplex is routed between a 1394 AV link layer interface and a 1284 controller interface.
14-1-3 MPEG
MPEG (pronounced M-peg), which stands for Moving Picture Experts Group, is the name of family of
standards used for coding audio-visual information (e.g., movies, video, music) in a digital compressed
format. The major advantage of MPEG compared to other video and audio coding formats is that
MPEG files are much smaller for the same quality. This is because MPEG uses very sophisticated
compression techniques.
MPEG is an encoding and compression system for digital multimedia content defined by the Moving
Picture Experts Group(MPEG). MPEG-2 extends the basic MPEG system to provide compression
support for TV quality transmission of digital video. To understand why video compression is so
important, one has to consider the vast bandwidth required to transmit uncompressed digital TV
pictures.
Phase Alternate Line (PAL) is the analogue TV transmission standard used in the UK, and
throughout many parts of the world. A uncompressed PAL TV picture requires a massive 216 Mbps,
far beyond the capacity of most radio frequency links. The U.S. uses an analogue TV system called
NTSC. This system provides less precise colour information, and a different frame rate. An
uncompressed NTSC signal requires slightly less transmission capacity at 168 Mbps.
The situation becomes much more acute, when one realises that high definition TV is just around the
corner. A High Definition TV (HDTV) picture requires a raw bandwidth exceeding 1 Gbps (1000
Mbps).
Samsung Electronics 14-1