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Short Technical Guide
94
PCR PID is the identification number for the synchronisation signal.
The PCR PID is normally identical to the video PID. For programmes
broadcast in multiple languages, the audio PID can be entered
manually to assign a different language to the TV programme. After
the PID is entered, the digital receiver automatically selects the audio
data identified by the PID number from the data stream and assigns it
to the video signal.
Programme package
The programme package for a digital transponder normally includes
several TV and radio programmes. Each programme package has a
fixed assignment for the transponder transmission frequency, for
polarisation (horizontal or vertical), for the symbol rate and for the
Viterbi rate or error rate.
PIP
Picture In Picture function
Symbol rate
The symbol rate describes the quantity of data that is transmitted per
second. The symbol rate is measured in MSymbols/s and is equal to
the number of symbols received per second.
Transponder
A transponder is a satellite channel which transmits TV and radio
signals. A satellite has several transponders.
Analogue transponders transmit only one TV programme and possibly
multiple radio programmes on the transmission frequency.
Digital transponders simultaneously transmit several TV and several
radio programmes at a transmission frequency. If a programme
provider is broadcasting several TV programmes via a digital
transponder, we refer to the provider's programme package. The
terms “digital transponder” and “programme package” have the same
meaning.
Video bit rate
The video bit rate describes the quantity of data from the digitised
video signal that is transmitted per second.
Viterbi rate
The Viterbi rate (code rate, error rate) characterises the error
protection used by the programme provider. The DVB standard
provides the following values: 1/2 - 2/3 - 3/4 - 5/6 - 7/8