Digital Video Broadcasting
The term Digital Video Broadcasting (short DVB) is originally a synonym for Digital TV (short DTV), and refers to telecommunication systems that send TV signals by way of digital transmission schemes, in contrast to the older, traditional, methods of signal transmission employed by Analog TV systems.
In general, Digital TV, or if you prefer Digital Video Broadcasting, consists of the transmission of data packets which carry encoded video/audio, and other payload data (such as EPG information), that has been combined and encapsulated within MPEG-2 Transport Streams. Digital TV signals will adhere to a particular standard which will, suiting to the type of transmission pathway involved, define the specific way the digital video streams used in transmissions are encoded. Specifically, for each standard, the Modulation Scheme, frequencies, transmission parameters and other factors are outlined and optimized for different transmission networks and target devices.
- DVB-S - Digital Video Broadcasting - Satellite -- the DVB standard for satellite based digital television transmission
- DVB-S2 -Digital Video Broadcasting - Satellite - Second Generation
- DVB-C - Digital Video Broadcasting - Cable -- the DVB standard for digital television transmissions over Cable Networks
- DVB-T - Digital Video Broadcasting - Terrestrial -- the DVB standard for digital television transmission over terrestrial airwaves ... i.e. Over/off-the-air ("OTA") signals received with a normal TV antenna
While much of the world utilises the above mentioned DVB Standards, other regions have opted for other Digital TV systems instead. For example:
- ATSC - The standards used in North America and S.Korea for digital television broadcast over terrestrial airwave (OTA)
- ITUJ. 83B (ITU-T J.83, Annex B) / ANSI/SCTE 07 (formerly SCTE DVS-031) / OpenCable™ / DOCSISTM -- defining the standard for digital television transmission over cable networks in North America
- ISDB (Integrated Services Digital Broadcasting) - The standards used in Japan, and soon perhaps elsewhere, for digital television broadcasting. Key standards from that aggregate include: