[opendtv] Re: News: DTV Boxes Could Cost $1 Billion
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 27 Jul 2004 20:10:09 -0400
I don't want to be too much of a party pooper but we should remember
that many of us on this list were very elated a year or so ago because
of the Linx results. And yet, for some reason, they are not yet on the
market.
I tend this time to believe the 5'th gen Zenith chip results because of
the credibility of the various folks involved in reporting it.
But I will be very disappointed if there is a long and unexplained delay
to market and we are instead asked to wait for a 6th generation of
anything. I think this will be ATSC's last chance at credibility.
But hopefully this time will be enough, and proven soon with 5'th gen
cheap USDTV receivers in my local Walmart.
- Tom
Manfredi, Albert E wrote:
> John Shutt wrote:
>
>
>>I am still in violent disagreement with you here, Bert. The digital
>>transition would have been much better off if the Sinclair
>>petition were accepted in 2000.
>
>
> I will actually *agree* with you there. The optimism we have
> seen this past week would have been there years ago.
>
> But, as I offered plenty of times, we can either whine or
> make the best of this. There are advantages to single carrier
> schemes, for this sort of application, that we can in the long
> run benefit from.
>
> Think of this as a hybrid between what a satellite broadcast
> system would choose as modulation scheme vs what a Wi-Fi or
> cellular telephone system would choose. DTT needs long range
> and high spectral efficiency as well as good multipath
> and mobile performance. You can argue from either side. It's
> not all bad, either way.
>
>
>>8-VSB, perhaps just the current ATSC implementation of it,
>>still produces a net negative atmospheric pressure.
>
>
> Oh, so *that's* why my ears keep popping.
>
>
>>They do not reproduce 2004 COFDM performance,=20
>>and by the time
>>they can (if ever), Moore's law predicts that COFDM would=20
>>have moved the
>>goalposts back even farther.
>
>
> John, on this we will continue to disagree.
>
> In the ultimate, 8-VSB will come out ahead. Why? Simple.
> COFDM has some 6700 carriers, several hundred of which
> are *not* suppressed. (I'm too lazy to check, but it's
> a sizable number of unsuppressed carriers.) They are
> used as pilots. In addition to this, COFDM has at least
> a 1/32 guard interval. So this combination results in
> extra demands for power and a little less spectral
> efficiency.
>
> The end result is that as equalizers tend to more
> perfection, and they inevitably will, with COFDM you will
> still be transmitting those pilots and taking up precious
> time with guard intervals that will not strictly be
> required anymore.
>
> I showed you the CRC tests done in 2002, and reported in
> 2003. At that time, at the ~20 Mb/s bit rate, it was
> virtual parity. You can keep asking yourself which system
> would be best at any given bit rate, but I'm positive that
> in the back of your mind somewhere, something is saying
> that the answer will flip over 180 degrees sooner rather
> than later.
>
> The software glitches you're finding are certainly not a
> function of modulation scheme, although they are a function
> of clearly written standards. I will grant you that. If you
> haven't done your trial by fire with DVB-T, I'm not sure
> what can be concluded. Perhaps DVB-T is more bulletproof in
> that regard, I just don't know. You don't hear horror
> stories on DVB-T until way after the fact.
>
> Bert
>
>
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