Philips 14AA3322/40B Installationsanleitung PDF herunterladen (Seite 24)

Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal

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high-level communication channel into several low-level logical channels, one for each message

signal or data stream to be transferred. A reverse process, known as demultiplexing, can extract

the original channels on the receiver side. The device that performs the multiplexing is called

multiplexer and the device that performs the reverse process is called demultiplexer.

There are several types of multiplexing methods:

 Space division multiplexing

 Frequency division multiplexing

 Time division multiplexing

 Polarisation division multiplexing

 Orbital angular momentum multiplexing

 Code division multiplexing

The usage of multiplexing since the very early years that it was discovered is very wide. The

areas that it was used and it is currently used are:

 Telegraphy

 Telephony

 Video processing

 Digital broadcasting

 Analog broadcasting

Image 9.1.4.1: Multiplexing and demultiplexing structure.

9.1.5 Multiplexed transport stream:

A multiplexed transport stream is the result of the combination of two or more transport

streams with the multiplexing. When delivering more than one programs it is more convenient

and easy to include them in one broadcast instead of having as many broadcasts as the

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Philips 14AA3322/40B Installationsanleitung Seite 24