[opendtv] Re: Samsung Prototype ATSC Receiver Test Report
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 12 Oct 2005 13:39:15 -0400
Was talking to Doug McDonald on the phone a short while ago. He commented
that his simulations of equalizers using DFT for calculating weighting
coefficients confirmed the desirability of fractional equalization for
correcting certain multipath conditions.
Al Limberg
----- Original Message -----
From: "Richard Hollandsworth" <holl_ands@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, October 11, 2005 6:13 PM
Subject: [opendtv] Samsung Prototype ATSC Receiver Test Report
> CRC posted test results for two Linx (now Micronas) ATSC Receiver
Prototypes (Apr02 and Mar03) and a Zenith/LG ATSC Receiver Prototype
(Sep03).
>
>
>
> CRC has not posted the fol. report on a Samsung ATSC Receiver Prototype:
> http://www.crc.ca/en/html/crc/home/research/broadcast/rtnt
> "Lab. Eval. of a Prototype Samsung ATSC Receiver" dtg 30Aug05.
> The Samsung prototype uses a commercially available ALPS Tuner Module and
> Samsung's "Gemini" ATSC Decoder chip (whatever that is...)
>
> The ALPS Tuner Module has a desired signal overload point of +1.5 dBm and
> a sensitivity of -84.7 dBm (that's a Noise Figure of about 6 dB).
> Perhaps it's the Alps Electric TEQH Tuner Module???
>
> Samsung performance met all ATSC A/74 Guidelines (unlike other tested
prototypes),
>
> with performance under most test conditions, exceeding the performance of
both
> the Zenith/LG Prototype and the two versions of Linx (now Micronas)
Prototypes.
>
> Under marginal SNR conditions, the Samsung could not handle low delay
echos
> (< 1 usec, i.e. less than 0.2 mile path differential),
> where the multipath components are within a few dB of each other.
> This can occur when there are nearby reflecting objects
> (e.g. your neighbor's house and/or your interior/attic location).
>
> Nonetheless the Samsumg Prototype still outperformed the Linx and
> especially the Zenith/LG Prototypes under these so-called "zero echo" test
conditions.
>
> As always, these are results for PROTOTYPE equipments and may or may not
> be representative of (hopefully improved) production equipment.
>
> I also have been unable to determine exactly WHAT was in the Linx
(Micronas)
> and Zenith/LG Prototypes relative to production chips....
>
>
>
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