[opendtv] Re: Letter to TV Technology
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 9 Oct 2007 09:21:12 -0400
Bob Miller wrote:
> In fact the only time anyone seriously worried about legacy receivers was
when there were very few of them and it was a convenient argument against
allowing COFDM. Now that there are lots of legacy receivers
those who still are proponents of 8-VSB are not worried about the threat of
another modulation being considered and will have no problem making them
obsolete.
The problem with COFDM is that there is no way to gradually reduce ordinary
8VSB transmissions and ramp up COFDM transmissions. A gradual changeover is
more desirable in advertizer-supported OTA from a business standpoint. The
convolutional byte interleaving and 2/3 trellis coding of 8VSB data fields
prevent a mixed transmission using COFDM.
The robust transmissions that have been proposed within ATSC fit with
convolutional byte interleaving and 2/3 trellis coding of 8VSB.
Al
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