Kathrein UFD 574/S User Manual

Also see for UFD 574: Mode d'emploi

Contents

Small Technical Encyclopaedia62Small Technical EncyclopaediaDVB MPEG-2DVB is short for Digital Video Broadcasting. DVB-T points to thetransmission method (T = terrestrial). MPEG is short for MovingPicture Experts Group, a task force drawing up internationally validstandards for the digital audio and video compression. MPEG-2 wasmade the standard in the compression of digital TV signals. MPEG-2functions in a data rate of up to 100 MBit/s.Eb/No ratioThe Eb/No ratio is a measure for the signal-to-noise ratio of the digitalsignal. This value is not identical to the C/N value know of theanalogue reception technology. In the case of Eb/No values below 5dBreception is normally no longer possible.FECFEC is short for Forward Error Correction. The error rate FECcorresponds to the Viterbi rate.PIDThe PID number (Packet Identification) is an identification number forvideo and audio signals in the digital data stream of the DVB-MPEG-2signals. With the PID number, the receiver can establish a clearallocation of the video and audio data transmission. The PID-PCR isthe identification number for the synchronisation signal. The PID-PCRnormally is identical to PID-Video. In multilingual programmes, anotherlanguage could be assigned to the TV programme via manual audioPID input. After the PID input, the receiver automatically selects theaudio data identified by the PID from the data stream and assignsthem to the video signal.Channel PackageFor the most part, the channel package contains several TV and radiochannels. Each channel package is fixedly assigned to the transmitfrequency, the polarisation (horizontal or vertical), the symbol rate andthe Viterbi rate or error rate.Symbol RateThe symbol rate describes the amount of data transmitted per second.The symbol rate is measured in MSymbole/s and equal to the amountof symbols coming in per second.Video Bit RateThe video bit rate describes the amount of data of the digitalisedvideo signal transmitted per second.Viterbi RateThe Viterbi rate (Code rate, error rate) characterises the type of errorprotection utilised by the programme provider. The DVB standarddetermines the following values: 1/2 - 2/3 - 3/4 - 5/6 - 7/8

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