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Read this: BBC - Blogs - Internet blog - HD Test Card Special

Summary: The test card returned in December 2008 after a long break in a new turbo charged high definition format along with the brand new AV sync check signal. The test signal package was added to the BBC HD promotion after we had many complaints about lip sync and odd looking pictures. The biggest issue was definitely lip sync however the complaints suggested we could have up to a four frame audio lead and a two frame video lead often on the same programme and at the same time - link

BBC - Blogs - Internet blog - HD Test Ca…

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