[opendtv] Re: Exploring the Off-Air DTV Dilemma

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Tue, 17 Aug 2010 17:09:38 -0500

Al Limberg wrote:

> The problem with DTV in low signal strength areas is that sound
> has noticeable glitches even though picture is reasonably
> flawless.  I am surprised that the industry hasn't attempted to
> fix this.

Now, if they wanted to, they could. If the M/H streams are simulcasts of the 
normal streams, it should be easy enough for fixed receivers to be able to 
switch to the M/H stream, when the regular stream is bad.

Could be done for audio-only, which would take even less bandwidth than 
providing a complete duplicate.

The lower quality video and audio would in a sense emulate the lower quality 
analog one got, in these same circumstances. The picture wouldn't be snowy or 
ghosty, obviously, just lower res.

IIRC, M/H can require something as low as 4 dB of C/N for error-free reception. 
Or maybe even less than that.

Bert
 
 
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