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China Blue High-Definition (CBHD; Chinese: 中国蓝光高清光盘; alternatively "China High Definition DVD") is a high definition optical disc format announced in September 2007 by the Optical Memory National Engineering Research Center (OMNERC) of Tsinghua University in China.

The format is a derivative of the HD DVD, a medium created by the DVD Forum designed to succeed regular DVDs.

Although HD DVD was scrapped as a result of losing the format war to Blu-ray, CBHDs continued to be produced and marketed, though only in China.

History

Originally called CH-DVD, CBHD is a joint venture between the DVD Forum and OMNERC. Development began in 2005, and an early prototype was demonstrated in 2007.[1] In 2008, during the DVD Forum's 42nd Steering Committee Meeting, the DVD Forum gave OMNERC the permission to edit HD DVD specifications.[2]

Though HD DVD proponents had hoped that CBHD would be a viable successor to the HD DVD format, the CBHD spec was ultimately incompatible with HD DVD players despite the similarities between the two. As a result, CBHD is a proprietary format unique to China.

Technology