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PID
The PID (Packet IDentifi cation) number is an identifi cation number for video signals and audio signals in
the digital data stream of DVB-MPEG-2 signals. The receiver uses the PID number to create a unique
assignment for the video and audio data transmission. The PCR PID is the identifi cation number
for the synchronisation signal. The PCR PID is normally identical to the video PID. For programmes
broadcast in multiple languages, the audio PD 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 identifi ed by the PID number from the data stream and assigns it to the video signal.
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 channel and possibly multiple radio channels on the
transmission frequency.
Digital transponders simultaneously transmit several TV and several radio programmes at a transmission
frequency. If a channel provider is broadcasting several TV channels via a digital transponder, we refer
to this as the provider‘s channel package. The terms “digital transponder” and “channel 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
SHORT TECHNICAL GUIDE