Digital TV is delivered via cable, satellite, aerial and broadband
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More than 500 million homes around the world will have digital TV by 2011, according to a report.
Informa's Global Digital TV report estimates that 40 million more homes will get digital TV by the end of 2006 with a further 46m in 2007.
"Digital growth will accelerate as the decade progresses, especially outside North America and western Europe," said Informa's Adam Thomas.
But 60% of TV households will still receive analogue signals by 2011.
Report prediction
By the end of this year there will be an estimated 183 million digital homes, said the report.
More than 344 million digital homes will be added to the total between the end of 2005 and 2011, predicted Informa.
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China will be a major contributor to this increase by accounting for 98 million of the extra homes - or 28% of the global increase in these years, said the report.
Other significant rises are expected in the US, India and Japan.
Mr Thomas said: "These four countries combined will account for 60% of the extra digital households.
"However, most countries will experience significant additions to their digital household total."
Digital cable is expected to be the most popular form of delivery for digital TV, accounting for more than 50% of all homes.
Informa predicts that just 35 million households will receive IPTV (TV via broadband) in five years time.
TV on demand
Growth in digital services is expected to be fuelled by developments such as TV on demand and personal video recorders.
In the UK, some homes will have to switch to digital when the government turns off the traditional analogue television signal.
The Cumbrian town of Whitehaven will be first to lose its analogue signal in 2007, with the switchover process due to be completed by 2012.
About 72.5% of UK homes already have digital television.