HDMI - sound and vision

Two questions please - does HDMI output in dolby digital or uncompressed? & also do I need to run a normal coax cable to my TV if I connect with HDMI as the PDF set up guides implies?
I have a BOSE system which I would ideally like to route just an HDMI cable to then this would carry sound and vision 5.1 included to my TV?
Thanks in advance for your help
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The HDMI carries either normal stereo (which may or may not have Dolby Prologic encoding) for standard broadcasts or regular On-Demand content, and Dolby Digital 5.1 for downloaded HD content.
If you're proposing to route the HDMI to the Bose system and from there to the TV, your Bose will need to be able to insert delay in the audio otherwise it is likely to be 100-200ms ahead of the picture. If instead you are able to take the HDMI to the TV first and then an optical 5.1 audio feed from the TV to the Bose, you could well find that the TV will have already added the audio delay in order to sync with the picture.

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TwoPointOh
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HDMI - sound and vision

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