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2 bases and introduction

 2.3 digital television

Since the first basic considerations at the beginning of the 1990 years and the beginning of the conversion of similar to digital by '' the society for the promotion of the broadcast supply, created in Germany 1993, '', briefly GARV, 34 conquers digital television the German households. Also European-wide efforts are based in the year 1993, as the DVB project started in Switzerland became35.
Until 2010 is to be able to receive now all German households digital television over a uniform standard. The digital standard improves the television in various regard by increased the transmission capacities36 and a multiplicity at additional information and services37 the advantages is here in summary represented:

Advantages digitally of the TV38
Improves transmission: Digital technique makes a higher information transfer possible by compression algorithms: Improves pictures, better clay/tone, more channels with less susceptibility to interference. The best conditions for the Heimkino Feeling, because with some film highlights the clay/tone in the Dolby digital format radiated39 becomes
More achievements: From the digital transmission path also new coding standards resulted. They e.g. make possible a multiplicity of Pay TV for offers like video on and, or an almost unbelievable number at transmitters, also foreign in DVD quality with many interactive additional information and in addition international Newsticker40, email functions and electronic purchase, individual video information about other countries or vacation goals, live Chats and plays.
Mobile receipt: The transmission by antenna offers '' the over all television '' slackly.
All the same whether laptop, car or campground, PDA, mobile phone or Smartphone, digital television know everywhere are used.

Table 5: Advantages of the digital television


The digital signal can be received over the following ways: By satellite (DVB-S), by cable (DVB-C) or by antenna (DVB-T). In most densely populated areas in the meantime the receipt is no more problem. Additionally extensive service offers or a multiplicity at transmitters can be referred.
Digital television is strongly supported by economic side. '' Digitally the video Broadcasting Project '' 41, in over 270 the enterprise such as broadcast operator, manufacturer, Kabelund software companies and authorities from 35 countries co-operate, create for many years uniform standards. Digital television is European-wide, exactly the same as for a long time in Asia and South America a current and profitable topic. Digital television knows become42 on different ways received:

Table 6: Receipt of the digital television


2.3.1 digital television in the living room

Who would like to use digital television at the similar terminal, those needs to process additional components the digital signal and decodes43. For the translation a set Top box becomes needed44. Modern Integrated digitally TVs, briefly IDTV45, already inserted so a box. Who would like to transact photographs, needs a DVD recorder, which stores then the similar pictures and tones on CD or DVD. Another possibility are non removable disk recorders and/or Festplattenreceiver, them are recording equipment and set Top box in one. They store the data on an internal Non removable disk 46. Recorders, which support DVDRAM, offer the Time-Shift-function 47. The photograph formats however often make a re-using of the transmissions e.g. at the PC not possibly48. Often one pushes thereby also fast to the borders of the internal non removable disks

2.3.2 digital television at the PC

For the digital television is also the PC, if with appropriate capability characteristics available, as Multimediaanlage at home suitably. Such HTPC is able most diverse Multimediadaten like e.g. MP3s, VCDs, DVDs, DivX and AVI files to play 49 the equipment summarizes thereby single devices like e.g. video recorder, DVD player, CDSpieler, Hifi plant in equipment and made possible thereby still further application possibilities. Everything which is for this needed is a DVB map or a set Top box with digital exit and a connection, attached by USB, by cables, satellite or antenna.
Unfortunately some maps are unausgereift in the range of the DVB-T some more; for many maps are protect '' Patchorgien '' necessarily, in order to make the devices executable. In addition the appropriate software, those belongs often to the maps attached, but sometimes still not very much comfortable50.
Therefore lately different open SOURCE projects developed, with which with the help of the engaged developer municipality free and comfortable software for all requirements is to be provided. Thus the PC becomes the alternative opposite the classical television set.
Selected ones well-known and thus strongly forced open SOURCE projects for Linux are here in the following presented.


  • 34: The society was created at the 22.Dezember 1993, more in addition under [GARV 2005] Home.
  • 35: Under the homepage of the project there is much, also world-wide information over the DVB standard. See [DVB-O 2005] Home
  • 36: Compression possibilities like the MPEG2 standard let save up to 96% the data set. Thus digital can be sent instead of a similar program on a frequency in the meantime up to 10. Exactly the same frequencies are cut off with the tones, in order to reduce the data set.
  • 37: See [Dig f 2005] introduction
  • 38: See for this [Ue-TV 2005] the over all television and [CT-SO 2004] P. 118 FF
  • 39: See [CT-SO 2004] P. 119
  • 40: Offerers e.g. are [Kab D 2005] or [Kab b 2005]
  • 41: See [DVB-O 2005] Home
  • 42: See [CT-SO 2004] P. 28 FF
  • 43: See [Dig f 2005] introduction
  • 44: See [DVBT 2005] FAQ; Set Top boxes are called often also DVB or digital Receiver.
  • 45: See [Ue-TV 2005] devices
  • 46: An overview of presently offered non removable disk recorders can be reread under [celebration 2005]
  • 47: Deferred television is a popular function with digital video recorders, with which a transmission is taken up, while only little minute can be already begun later with looking at and the admission continues to run in the background. 48 see.
  • 48: [CT-SO 2004] P. 28 FF the subsequent treatment of the data is not so easily possible due to incompatible data types. The manufacturer Seagate calls this procedure "DriveTrust technology ". See for this [PCMA 2005] message 37280
  • 49: See [Wiki 2005] HTPC
  • 50: See [CT-SO 2004] P. 125 FF, unfortunately is also the 2005 still like that, as had to be determined in the context of this thesis (diploma).

 

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