[opendtv] Re: DVB Receiver Standard
- From: Richard Hollandsworth <holl_ands@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 15 Dec 2005 02:27:28 -0800 (PST)
The recent FCC/OET test included Sensitivity and an INFERRED Noise Figure
for 5 HD STBs and 23 DTVs currently on the market:
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-05-199A1.pdf
Most units demonstrated VHF and UHF Noise Figures under 8 dB, with some notable
exceptions as high as 21 dB.....all in the VHF band. The worst UHF NF was 9.5
dB.
One thing that can reduce an HDTVs Noise Figure by 4 dB is a Dual Tuner (i.e.
PIP) that uses an internal rather than an optional external splitter.
<holl_ands>
===========================================
Dale Kelly <dalekelly@xxxxxxxxxxx> wrote:
One very important performance specification unaddressed by ATSC
document is that of receiver noise figure. Industry sources have stated that
the typical ATSC receiver, using the cable ready configuration (the vast
majority of receivers sold), has a noise figure of 12 to 14 DB. On the other
hand, DVB allows only a maximum of 8 db and recommends 7db or less.
Documentation available from DVB suppliers indicates typical noise figure
performance to be 5db. The much higher noise figures exhibited in ATSC
receivers will likely negate the much touted advantage gained from the
higher transmitted power levels of that standard.
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