On 11/12/05 17:15, Nathan Allen Stratton wrote:
My current myth box uses 2 convertx boxes, but I just bought a HD-3000
card and monday should have my antenna. Do I need to do anything special
to get 5.1 channel sound?
Nope. ATSC (US high-definition TV) is broadcast already encoded using
the MPEG-2 system. The audio is encoded in an AC-3 stream within the
transport stream. So, it's just there.
How is 5.1 compressed with mp3?
MPEG-{1,2} Layer {2,3} audio only supports 1- or 2-channel audio. There
is a "stereo compatible" version called "MP3 Surround" which supports
5.1 channel audio in much the same way that Dolby Surround provides a
"stereo compatible" 4.0 channel audio encoding. However, ATSC requires
the use of AC-3 for audio content (although they call it A/52), so no
extra work is required to get it.
Mike
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