Digital TV has three transmission modes, terrestrial, satellite and cable. In 1995, DVB was established by 150 European organizations. It has 200 members now. As to the terrestrial digital TV broadcasting standard, EU DVB-T, US ATSC (Advanced Television System Committee) and Japan ISDB-T (Integrated Services Digital Broadcasting) are approved by ITU. And China has launched the DMB-T/H.
From the picture, you can know where each of the digital standards is used across the world.
DVB-T
It is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television that was first broadcast in the UK in 1997. This system transmits compressed digital audio, video and other data in an MPEG transport stream, using coded orthogonal frequency-division multiplexing (COFDM or OFDM) modulation.
ATSC
The ATSC standard was developed in the early 1990s by the Grand Alliance, a consortium of electronics and telecommunications companies that assembled to develop a specification for what is now known as HDTV. ATSC formats also include standard-definition formats, although initially only HDTV services were launched in the digital format.
ISDB-T
ISDB is a Japanese standard for digital television (DTV) and digital radio used by the country’s radio and television stations. ISDB replaced the previously used MUSE “Hi-vision” analogue HDTV system. An alternative standard based on the original ISDB was developed by the Brazilian government and is being widely adopted in South America.
DMB-T/H
It is the digital terrestrial television (DTT) standard adopted in the People’s Republic of China (PRC), including Hong Kong and Macau. This mandatory standard covers both fixed and mobile terminals and will eventually serve more than half of the television viewers in the PRC, especially those in suburban and rural areas.
The related websites:
• The Wikipedia page for Digital Terrestrial Television
• The Wikipedia page for Digital Terrestrial Television Deployment by country
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