[opendtv] Re: Integrated DTV PSIP

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Wed, 7 Dec 2005 12:07:16 -0500

Cliff Benham wrote:

> The only 'real world' tests, the results of which I
> have any confidence in are those conducted at the Schubin
> apartment because they deal with actual reception conditions
> consumers will meet and they are not based on laboratory
> simulations.

They deal with only one type of reception condition.

The reason I think the Schubin apartment tests matter is
that they address what used to be the very worst possible
environment for 8-VSB. Meaning, 100 percent reflected
signal, and in the "hole of the doughnut" zone of signal
coverage, i.e. close to the transmitter site. This is where
8-VSB was known not to work. And in a high RF clutter
environment to boot.

But that site alone does not cover all bases. One would think
the majority of the US do not live within 2 miles of the
transmitter towers.

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