[opendtv] Re: DD audio bit rates

If there were a dual-channel AC-3 decoder in existance, I would expect Mark
Schubin to announce it from the rooftops.

John Willkie
----- Original Message ----- 
From: "John Shutt" <shuttj@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Wednesday, July 27, 2005 2:13 PM
Subject: [opendtv] Re: DD audio bit rates


> John,
>
> Ah yes, I see that in A/53 now.  Thank goodness we're in compliance, since
> it says that a complete main channel is to be less than or equal to 448
> Kbps.  So you can have a 2.0 complete main program encoded at 384.  Our
> Second Audio program channel which is 1.0 and encoded at 192 Kbps is also
> compliant since it is a complete service.
>
> It's a mono channel or two channel associated dialogue service (intended
to
> be decoded and mixed with another service such as Music) that is limited
to
> 128 and 192 Kbps respectively, and all associated services intended to be
> mixed together must total less than 576 Kbps. (Music and Effects, Dialog,
> and Voice Over for example.)
>
> I still don't know of a single ATSC receiver built and offered for sale
that
> has dual Dolby decoders for such mixing, so the limitations are mute, and
> recommend practice is to have a Visually Impaired, Hearing Impaired, or
> Commentary service be a Complete Main (stand alone) mix, and as such would
> qualify for the 448 maximum even if it were mono audio.
>
> John
>
> ----- Original Message ----- 
> From: "John Willkie" <JohnWillkie@xxxxxxxxxxxxx>
>
>
> > John;
> >
> > I'm sorry, I should have been more specific.  What A/52 gives in bit
> > rates,
> > A/53 takes back in audio system constraints, and adds a few new
> > requirements.
> >
> > John Willkie
>
>
>
>
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