Datacasting
Encyclopedia : D : DA : DAT : Datacasting
Datacasting is the broadcasting of data over a wide area via radio waves. It most often refers to supplemental information sent by television stations along with digital television, but may also be applied to digital signals on analog TV or radio. It generally does not apply to data which is inherent to the medium, such as PSIP data which defines virtual channels for DTV or direct broadcast satellite systems; or to things like cable modem or satellite modem, which use a completely separate channel for data.
Datacasting often provides news, weather, traffic, stock market, and other information which may or may not relate to the program[s] it is carried with. It may also be interactive, such as gaming, shopping, or education. An electronic program guide is usually included, although this stretches the definition somewhat, as this is often considered inherent to the digital broadcast standard.
The ATSC, DVB and ISDB standards allow for broadband datacasting via DTV, though they do not necessarily define how. The overscan and VBI are used for analog TV, for moderate and low bandwidths (including closed captioning in the VBI) respectively. DirectBand and RDS/RBDS are medium and narrow subcarriers used for analog FM radio. The EUREKA 147 and HD Radio standards both allow for datacasting on digital radio, defining a few basics but also allowing for later expansion.
Datacasting Services around the World
Australia
Australian broadcast infrastructure company Broadcast Australia are undertaking a three year trial in Sydney of a datacasting service using the DVB-T system for use in Australia.There is are a number of datacasting services available only in Sydney, including:
- A program guide (Channel 4)
- ABC news, sport, and weather items (Channel 41)
- ChannelNSW Government and Public Information (Channel 45)
- Australian Christian Channel (Channel 46)
- MacquarieBank TV (Channel 47)
- Expo Home Shopping (Channel 49) and
- Federal parliamentary broadcasts.
See also:http://en.wikipedia.org/wiki/List_of_digital_television_deployments_by_country#Australia
Malaysia
Malaysian multi-channel pay-TV operator, MiTV Corporation Sdn Bhd has launched its IP over UHF service in September 2005. The full digital broadcast capacity is being used to deliver IP services which such as multicast streaming and datacasting.
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