Digital VideoBroadcasting (DVB) started in 1993 with the aim of developing European standards for digital broadcasting, digital TV, multimedia services and interactive distribution services. These can be distributed via broadband cable networks using DVB-C, via terrestrial networks using DVB-T, with handhelds as DVB-H and DVB-X, via satellite as DVB-S, or via telecommunications networks.
Different transmission methods had to be developed and standardised for the various transmission paths. The conceptual basis of all DVB transmission modes is a container, which can be of different sizes for the various transmission media. For terrestrial transmission (DBV-T), for example, this container can transmit up to 24 Mbit/s perchannel at a bandwidth of 8 MHz. Coded Orthogonal Frequency Division Multiplex (COFDM) is used as the modulation method. In broadband cable networks (DVB-C), the data rate can be up to 38 Mbit/s with the same channel width.
DVB terrestrial, via cable and satelliteFor compression, DVB uses MPEG-2 in the Main profile and SNR profile. Audio Code Number 3 (AC-3) and Digital Theatre Sound (DTS) can also be implemented as audio compression.
Since the Europeans also wanted to transmit voice and video in their standard, the two organizations DVB and Digital Audio and Video Council (DAVIC) joined forces in the mid-1990s and formed the DVB/DAVIC standard also known as DVB/RCCL (Return Channels for Cable and LMDS). This standard, designated ETS 300 800 by the European Telecommunications Standards Institute (ETSI), is suitable for transmission in both HFC networks and wireless LMDS networks. The International Telecommunication Union (ITU) has adopted this standard under the ITU designation J.112.
In addition, the DVB organisation has adopted a standard for satellite communication, DVB-RCS (Return Channel for Satellite). On the basis of this standard, terminal equipment of the next generation can receive digital television programmes and computer data at transmission rates of up to 50 Mbit/s and communicate with the satellite via return channel at up to 2 Mbit/s.