Digital Video Broadcasting-Terrestrial (DVB-T) uses coded orthogonal frequency-division multiplexing (OFDM) modulation and supports hierarchical transmission. This standard has been adapted in Europe, Australia and New Zealand.
Terrestrial Integrated Services Digital Broadcasting (ISDB-T) is a system designed to provide good reception to fix receivers and also portable or mobile receivers. It utilizes OFDM and two-dimensional interleaving. It supports hierarchical transmission of up to three layers and uses MPEG-2 video and Advanced Audio Coding. This standard has been adopted in Japan, Philippines. ISDB-T International is an adaptation of this standard using H.264/MPEG-4 AVC that been adopted in most of South America and is also being embraced by Portuguese-speaking African countries.
Digital Terrestrial Multimedia Broadcasting (DTMB) adopts time-domain synchronous (TDS) OFDM technology with a pseudo-random signal frame to serve as the guard interval (GI) of the OFDM block and the training symbol. The DTMB standard has been adopted in the People’s Republic of China, including Hong Kong and Macau.
DVB-T in Thailand
On January 25, 2013, The Royal Thai Army’s Radio and Television station, Channel 5, has launch a trial DVB-T2 service. The service have 6 SD Channels plus 2 HD channel. It has successfully completed Thailand’s first DVB-T2 digital terrestrial TV trial with the help of Harris and one of its Maxiva UAX air-cooled UHF transmitters. On March 4, 2013, Free Television Channel 3, 5, 5HD, 7, 9, NBT, ThaiPBS, ThaiPBS HD get temporary permission to broadcast Digital TV in DVB-T2 system until issue actual license that expect to be released in the middle to end of 2013.
Thaicom Public Company Limited (formerly Shin Satellite Public Company Limited) has a brand-new satellite orbiting the Earth. It is called Thaicom 6 and it is intended to provide communication service to Southeast Asia, Africa and Madagascar. Its primary function will be to provide “direct-to-home” (DTH) satellite television service here in Thailand.
The satellite was successfully launched yesterday from Cape Canaveral, Florida by a Falcon 9 v1.1 space vehicle owned by the private company SpaceX (Space Exploration Technologies Corp).
As of yesterday, the satellite was undergoing manoeuvres to put itself into a geostationary orbit meaning it will be travelling at the same speed as the earth rotates Thus, it will always seem to be motionless above the same location on Earth. This will make it easy for us here in Thailand to receive its signals.
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