Simulcast
Simulcast [ ˈsɪmjʊlˌkɑːst ] (from English simultaneous “simultaneously” and broadcast “send”) stands for a simultaneous transmission of the same content over several radio channels .
So is z. B. the same program from ARD can be received terrestrially digitally via antenna and satellite . In addition, digital and analog transmissions come in many cable networks and on the Internet as a stream . The result differs only in a slight delay, since a longer distance has to be covered when transmitting via satellite (approx. ¼ of a second) and with digital television there is also a (sometimes even longer) time to convert the digital television signal into the television picture come in addition.
Due to the digitization of the television program, terrestrial broadcasts via analogue channels have already ceased to exist (see "Everywhere TV" DVB-T ). Analogue satellite broadcasting ceased on April 30, 2012 . The analog quality remained almost the same on all routes and never exceeded the values specified in PAL . That changed only with HDTV , as a channel is broadcast in high-resolution format.
In the past there were also simulcast programs broadcasting the same program on television and radio. VCR with "simulcast" switch could then parallel to the television picture, the (better) sound signal via FM radio , was broadcast on the HiFi - soundtracks record.
The term simulcast is also used in radio. For example, Deutschlandfunk can be heard in many areas of Germany on both VHF and DAB digital radio , and until 2014/15 also on medium wave and long wave.
HD simulcast
The term HD simulcast is used for the parallel broadcast of a television program in the quality levels HDTV and SDTV . In this way, the television broadcasters guarantee that the HD program can still be received with older devices for viewers without HD reception options.
Individual evidence
- ↑ Martin Emele: Pioneering work in HD simulcast operation. Television and cinema technology 8/9, 2006.
