Kathrein UFC 861si - Manual (Page 121)

121
SHORT TECHNICAL GUIDE
DVB MPEG-2
DVB is the abbreviation for Digital Video Broadcasting. DVB-S refers to the transmission method
(C = cable). MPEG is the abbreviation for Moving Picture Experts Group, a working group that
formulates internationally applicable standards for the digital compression of video and audio.
MPEG-2 has established itself as the standard for compression of digital TV signals. MPEG-2
works up to a data rate of 100 MB/s.
EB/NO RATIO
The Eb/No ratio is a measure of the signal to noise ratio of a digital signal. The value is not
identical to the C/N value familiar from analogue reception technology. At Eb/No values below
5 dB no reception is normally possible.
OTR
One Touch Recording
PROGRAMME PACKAGE
The channel package for a digital transponder normally includes several TV and radio programmes.
Each channel package has a fi xed 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
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 synchronization 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.