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Brief Technical Glossary
79
Programme package
The programme package for a digital transponder normally includes
several TV and radio programmes. Each programme package has
a xed assignment for the transponder transmission frequency, for
polarisation (horizontal or vertical), for the symbol rate and for the
Viterbi rate or error rate.
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 transmitter, which transmits TV and radio
signals. A satellite has several transponders.
Analogue transponders transmit only one TV programme and possibly
several radio programmes at 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
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