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SHORT TECHNICAL GUIDE
PIP
Picture In Picture function
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 PID-PCR 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.
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
TRANSPONDER
A transponder is a frequency converter which receives TV and radio signals broadcast from the
earth, converts them and the rebroadcasts them to the earth at a different frequency. A satellite
carries several transponders.
Analogue transponders transmit only one TV channel and possibly multiple radio channels on a
single transmission frequency.
Digital transponders transmit several TV and several radio programmes simultaneously on a
single transmission frequency. If a programme provider is broadcasting several TV channels via
a digital transponder, we refer to the provider's channel package. The terms “digital transponder”
and “channel package” have the same meaning.