[opendtv] Re: DVB Receiver Standard
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 6 Dec 2005 17:26:24 -0500
Dale Kelly wrote:
> The DVB receiver standards document is available at this URL:
>
> http://www.nordig.org/pdf/NorDig-Unified_ver_1.0.1.pdf
>
> It is a "voluntary" standard in that if you do not wish to
> follow it's requirements you may build a receiver however you
> please but you can't label it as being a DVB receiver. Note
> that the standard is very specific about front-end requirements.
It reads more like a combination of A/53 and A/74. It describes
the standard as well as give performance goals.
Interestingly, the terrestrial receiver requirements are not all
that stringent, at least comparing the performance minima set
for 3.3 b/s/Hz (equivalent to 8-VSB). This includes sensitivity,
dynamic range, adjacent channel rejection, co-channel rejection,
and C/N margins required in gaussian noise or with a single 0 dB
echo. In all the above, A/74 is similar or more stringent, where
it gives goals, or the newer ATSC receivers themselves measure
within these specs, even when A/74 does not explicitly state a
goal.
The only requirements that seem very stringent are those which
relate to echo tolerance of long time lag echoes, as one would
expect, especially because these are tabulated with respect to
guard intervals of 1/8 or greater, in 8K mode.
Bert
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