[opendtv] Re: PR: Enhanced AC-3 Audio Specifications Serve Multiple Applications
- From: Terry Harvey <tjharvey@xxxxxxx>
- To: opendtv@xxxxxxxxxxxxx, <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 09 Apr 2004 23:24:05 -0700
John,
Your comparison between DVB-hierarchal modulation and E-VSB is nebulous.
You have no quantitative data to support your assertion.
I recall the NAB demonstration. I was impressed but show me the direct C/N
ratio, BERs and bandwidths employed for a direct comparison. I suspect that
you will find that E-VSB is more robust under the comparison you describe.
Terry Harvey
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At 04:18 PM 4/8/2004 -0400, John Shutt wrote:
>I also equate E-VSB to DVB-T HM, but in concept only. ATSC takes a bigger
>hit in the high capacity bitstream to provide the robust stream than DVB-T
>HM does.
>
>For every Mbps of robust in ATSC, you subtract 2 Mbps from the standard
>stream. So for 4 Mbps of robust ATSC you get 11 Mbps of standard stream.
>
>For DVB-T, the mode that was demonstrated in Las Vegas (almost exactly) 4
>years ago at NAB 2000 had 13.6 Mbps in the LP stream and 4.5 Mbps in the HP
>stream.
>
>John Shutt
>
>----- Original Message -----
>From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
>To: <opendtv@xxxxxxxxxxxxx>
> > I equate E-VSB to hierarchical mode in DVB-T. For DTT, the
> > price you pay in payload reduction is apparently not worth
> > it to real operators.
> >
> > Bert
>
>
>
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