[opendtv] Re: (No Date: Tue, 28 Sep 2004 10:30:37 -0400

  • From: Bob Miller <bob@xxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sun, 10 Oct 2004 21:26:55 -0400

No one in there right mind would chose 8-VSB over COFDM now, in 2000, in 
1999 or five years from now. Mexico, Canada S. Korea and the US were all 
political decisions IMO. The best interest of the public were not and 
are not being considered.

I have done all the testing I need to do to know which is the best for 
our use. How many test have you done or do you plan on doing?

As far as going deeper into the building, the old AT&T HDQTs building at 
32 Avenue of the America's is a brick s**thouse. I remember one incident 
when we were only broadcasting from an apartment building above the 
Lincoln Tunnel with a 100 Watt antenna I was in the bowels of that 
building, AT&T, on the 24th floor with cages, servers and walls all 
around in the middle of the building and wanted to demonstrate our COFDM 
broadcast to the building manager. I simply turned to a cement pillar 
and plugged into an outlet there then realized I had no antenna. My 
finger touching the antenna connector did the job which amazed me. We 
had perfect reception even when I waved the receiver around, took it 
behind the pillar etc.

That same building with a 5th gen receiver on the 25th floor with a dual 
bow tie antenna was easily defeated at far far greater power levels even 
though that receiver and antenna were virtually a few feet and one wall 
from perfect line of sight to the source, The Empire State Building.

COFDM worked and could not be made to fail MUCH deeper in that building 
even though we were at FAR lower power levels and a slightly farther 
distance away.

BTW Hisense says that as soon as their current stock of 4th gen 
receivers runs out we will see 5th gen. I have no idea what that means 
time wise. They had said that they made or were going to make 400,000 
4th gen receivers. I don't know how many they actually made. Will know 
more about LG's plans by Wednesday.

Bob Miller

Manfredi, Albert E wrote:

>Bob Miller wrote:
>
>  
>
>>The point is not that COFDM can go to a higher bitrate
>>but that at an equal or slightly higher bitrate it is
>>still more robust than 8-VSB.
>>    
>>
>
>The point is, Bob, that your statement is unsubstantiated
>and non-credible. I'll bet you that if you actually did
>a test, with a 5th gen Zenith vs a current model COFDM
>receiver, you would see what I suggested. Indoors, with
>simple antenna, better dynamic echo performance for COFDM,
>and better weak signal performance from 8-VSB.
>
>Meaning, you can continue to receive a solid signal with
>8-VSB even as you go away from windows or exterior walls,
>where COFDM (64-QAM, 3/4 convolutional FEC, 1/16th GI)
>will drop the signal sooner. When severe multipath exists
>but no one is dancing in the signal path.
>
>  
>
>>And from there you can dial it down to whatever datarate
>>and robustness combo you want.
>>    
>>
>
>True. With the way E8-VSB is defined now, that should also
>be an option, although not at more than 3.3 b/s/Hz.
>
>  
>
>>If this was a horse race and COFDM and 8-VSB were nose
>>to nose with a quarter to go yes Vive la difference but
>>in this race COFDM won yesterday and 8-VSB is still at
>>the starting gate. Why are we bothering with it at all?
>>    
>>
>
>You, and some others, continue to make these tired claims
>from yesterday's information. We are where we are, and
>that won't change. The good news is that the tired old
>comparisons with the 1999 ATSC receivers are invalid and
>obsolete. You carefully mentioned "in the 2000 test" last
>time. I don't think you have a valid direct comparison
>test for the here and now.
>
>Bert
> 
> 
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