[opendtv] Re: Seeing Ghosts on a Single Frequency Network

  • From: Craig Birkmaier <craig@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Thu, 10 Feb 2011 07:38:22 -0500

At 1:44 PM -0500 2/9/11, Allen Le Roy Limberg wrote:


Also, a receiver with two front-end tuners may become commonplace in any
case.  Such a receiver is better for channel surfing or for switching back
and forth between RF channels.
There are many advantages to a receiver with two front ends, but most of them are based on the ability to receive DIFFERENT programs. DVRs all have multiple tuners so that you can record one program while watching another.
With multiple tuners you can do all kinds of bandwidth saving techniques like the ones I noted in the paper I recently linked on resolution independent coding. That is, you can turn the TV into the "master control switcher" to do some of the following:
1. crossfades or fade-through-black between program streams (entropy coders don't handles these transitions well). 

2. Switching to different versions of commercials for different sub markets.
3. Live overlays of graphics, crawls and logo bugs with proper positioning for any display. 

4. DVR capabilities

I suppose you could add #5

Use both tuners to get solid reception of one program...
I've still not seen any compelling arguments for MFNs, or any estimate of relative spectral efficiency when compared to SFNs using less spectrum.
But I am very pleased to hear that Mark Aitken and others are looking past current solutions to apply the best technology to the problem. 

Regards
Craig


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