About The Development Of Digital Video Broadcasting
Digital Video Broadcasting(
The Birth Of Digital Video Broadcasting
Initially, it was considered unrealistic for DVB to enter the average family, and the cost of the project was very high. In 1991, broadcasters and equipment manufacturers negotiated how to develop a unified standard for developing digital terrestrial television. At the end of the year, this unified standard had been formulated and implemented.
In 1993, the first generation of DVB-S systems for digital satellite broadcasting was developed, which meant that people could start receiving television programs via satellite.
In 1994, the first-generation digital cable network DVB-C appeared. Unlike DVB-S, this is a channel for cable transmission signals, which can transmit a complete satellite channel multiplex on the cable channel.
DVB-T is a more complex digital terrestrial television transmission system. This standard began to be researched in 1995, first released in 1997, and first used in the United Kingdom in 1998. Australia became the first to launch DVB-T service Asia-Pacific countries. This transmission method is widely used in many countries around the world.
Development Of Digital Video Broadcasting
DVB-S2 is the second generation digital video broadcasting of satellite. The system was developed by the International Industry Association in 2003, and was officially approved for use in March 2005. This system standard is improved on the basis of DVB-S, and the performance gain is about 30%. In 2014, the DVB-S2X system was released, but the mainstream system is still DVB-S2.
DVB-C2 is an upgrade based on DVB-C. In April 2009, the specification was approved by the DVB Association. Due to the limitation of DVB-C transmission capacity, HDTV, VOD, etc. are all restricted. DVB-C2 improves the transmission capacity by at least 30% on the basis of DVB-C, while maintaining the same bandwidth as the channel. DVB-C2 uses variable coding and modulation and adaptive coding and modulation modes.
DVB-T2 is the second-generation digital terrestrial television standard. The standard was approved by the DVB Steering Committee in June 2008 and transferred to the European Telecommunications Standards Institute the same month. This standard was adopted in September 2009. As of 2012, almost all of the world's well-known electronic equipment manufacturers have put into production of various equipment using the DVB-T2 standard.
Many countries that have just started the broadcasting industry have directly skipped DVB-T and used DVB-T2 system.
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