[opendtv] Re: PR: Enhanced AC-3 Audio Specifications Serve Multiple Applications
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 12 Apr 2004 11:54:56 -0400
Terry,
"Nebulous"?
Am I wrong about the HP to LP data ratio with E-VSB? Am I wrong about the
demos at the 2000 NAB?
For the modes used at the 2000 NAB demo, see:
<http://www.dvb.org/documents/white-papers/WP01%20(DVB-T%20Hierarchical).pdf
>
Modulation: 64 QAM/QPSK
Guard Interval 1/32
LP code rate 3/4
HP code rate 1/2
LP bit rate 13.6 Mbps
HP bit rate 4.5 Mbps
LP Gaussian noise performance 19.6 dB
SD Gaussian noise performance 10 dB (this number is on the document I point
to on the link above, but was not on the original March 2000 document which
I still have.)
However, it is a moot point, Terry, as E-VSB is as dead in the United States
as DVB-T is no matter how well it may perform.
Cheers,
John Shutt
----- Original Message -----
From: "Terry Harvey" <tjharvey@xxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>; <opendtv@xxxxxxxxxxxxx>
Sent: Saturday, April 10, 2004 2:24 AM
Subject: [opendtv] Re: PR: Enhanced AC-3 Audio Specifications Serve Multiple
Applications
> 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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