[opendtv] Re: 20050627 Mark's Monday Memo
- From: Bob Miller <bob@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 01 Jul 2005 10:19:06 -0400
And no, Sinclair is not impartial, they are a business. You can't get
more partial than that unless you are Republican and I think that
Sinclair is also Republican.
Bob Miller
BTW I voted for Bush Senior both times and Ronald both times but am a
registered Democrat (required in NYC) like our mayor Bloomberg, consider
myself independent and can't stand our current Cowboy in Chief.
John Willkie wrote:
>could you name a single organization that ever issued a document or
>documents that you do not agree with that you will still label as impartial?
>So far, your list of partial organizations is NAB, MSTV and now the CRC. Is
>Sinclair impartial?
>
>John Willkie
>
>
>----- Original Message -----
>From: "Bob Miller" <bob@xxxxxxxxxx>
>To: <opendtv@xxxxxxxxxxxxx>
>Sent: Thursday, June 30, 2005 11:27 AM
>Subject: [opendtv] Re: 20050627 Mark's Monday Memo
>
>
>
>
>>I don't think the CRC is an impartial organization. They have NO
>>credibility with me. I would not ask them the time of day.
>>
>>In fact the only credible test if you are going to make an investment is
>>to test yourself and the test we have done so far says that COFDM works
>>and has since we first tested it and 8-VSB has not and still does not
>>accept maybe with the latest receivers if we are willing to restrict our
>>venture to fixed receivers that will cost more than necessary and come
>>from a restricted list of manufacturers who themselves are less than
>>enthusiastic about the modulation and our prospects as customers using it.
>>
>>Not real exciting.
>>
>>You can continue twisting this anyway you want but the reality is that
>>in the US few entities of any kind have shown ANY interest in investing
>>in 8-VSB at any level unless force, cajoled or MANDATED and that ONE of
>>those few, ourselves, is possibly the BIGGEST critic of the modulation
>>8-VSB.
>>
>>The CEA which is maybe one of the biggest proponents of 8-VSB is also on
>>record as saying that OTA broadcasting is and should die.
>>
>>Bob Miller.
>>
>>Manfredi, Albert E wrote:
>>
>>
>>
>>>Bob Miller wrote:
>>>
>>>
>>>
>>>
>>>
>>>>If we had an 8-VSB receiver as good as a 1999 COFDM
>>>>receiver I would not be in doubt about a venture
>>>>with the 5th gen receivers we have tested so far
>>>>and would not be up late tonight talking to the Far
>>>>East about the latest.
>>>>
>>>>
>>>>
>>>>
>>>Context is everything.
>>>
>>>First of all, in urban canyon reception, COFDM is doing
>>>exactly what it was designed to do. That's where it's
>>>*supposed* to shine. So if it does, it should not come
>>>as a great surprise.
>>>
>>>But even in spite of that, real tests by the CRC, an
>>>impartial organization, provided this result in their
>>>September 2003 article in the IEEE Transactions on
>>>Broadcasting:
>>>
>>>"As shown in Fig. 4, the DVB-T receiver could handle
>>>pre and post ghosts over a wider range. It had a window
>>>of 74 us working within a delay range of -74 to +74 us,
>>>and capable of resolving zero dB ghost for a signal
>>>having a high C/N of 31 dB, and less than 1 dB ghost
>>>for a signal with a C/N of 22 dB."
>>>
>>>By comparison, the CRC test on both the LG and the
>>>previous Linx receivers showed that two 0 dB echoes,
>>>i.e. three equal strength symbols arriving 1 usec
>>>apart, as in Brazil E, could successfully be decoded
>>>with a C/N of only 25 dB. And less stressful profiles
>>>required C/N margins in ranges well below 20 dB.
>>>
>>>So this shows a mixed bag. The 8-VSB receivers still
>>>cannot match the echo tolerance range of COFDM with
>>>GI set to 1/16 (50 uS for LG, 74 uS for COFDM), but
>>>they can beat your 1999 COFDM performance for the
>>>very difficult Brazil E profile handily, with 6 dB of
>>>extra margin.
>>>
>>>This is what I'm getting at. Depending on specific
>>>surroundings, your sweeping assessment might apply or
>>>not. In GENERAL, these tests show what most people
>>>already know: COFDM is great in areas of high
>>>multipath. It is very robust. But it is best used
>>>where signal strength is not a big issue. That's why
>>>it's good for applications like WiFi. If signal
>>>strength is an issue, then even in *some* high
>>>multipath environments, the new 8-VSB receivers might
>>>have an edge. Unless you do the careful tests,
>>>sweeping generalizations are not credible.
>>>
>>>Bert
>>>
>>>
>>>
>>
>>
>>
>>
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