Craig Birkmaier wrote: > Yes this is doable in an ideal world. But the station may not have > the bits necessary to execute this strategy, especially in markets > like yours, where almost every station is already multicasting. I've gotten used to watching ads in lower resolution than the main program, because that's how a lot of the Internet TV shows work now. The ad breaks, for whatever reason, are much grainier than the show. And that's how this scheme would show up. It seems to me that Internet TV is more similar to OTA and to DBS, than it is to any walled garden, non-standard, proprietary, politically-limited-by-county-boundaries, cable system. The OTT sites cover (I think) a much larger area than local cable. And this is the future, as far as I'm concerned. The future is, you tailor the ads and other content through clever routing of packets, not through the physical separation caused by a cable plant. You need to stop thinking in terms of old infrastructures and old techniques. Even cable systems are moving more and more to IP. > Who is doing this [interactive ads to determine your preferences]? Not cable. Who is doing this is the OTT sites, including Hulu, but also some ads on cbs.com and other network sites, for example. Some of the Lowes ads ask for use participation, for instance. And not infrequently, when these OTT sites try to get too fancy, they mess up royally. To where the ad freezes up, for instance. (I found out that pressing the F5 key can unfreeze some of these unnecessary glitches, caused by overzealous and technically less than competent bean counters.) > It might even be time for another Open DTV forum... Or, same forum, but new discussion about topics that matter today, rather than topics that mattered 15-20 years ago. The 8-VSB vs COFDM debate is old, and quite frankly, even if DVB-T2 would be a good choice for a new one-way broadcast scheme, if I were the FCC commish, such a change would make me rethink and requestion everything about spectrum for broadcasting. > You can also checkerboard your channels so that each zone is independent. Arm-waving again? You can indeed, but then it wouldn't be a SFN. A cellular system is totally different from small sticks used in SFNs. If you set up a SFN for the main program material, then you can't use the same SFN frequency for cellular ads. You'd have to tell the receivers to retune their receivers for the cellular ads, where in these new and separate freqs, the small sticks each create a different cell. *WHICH MEANS*, Since you have to dedicate those separate frequencies anyway, you can also set up a true cellular broadcast infrastructure, as I described more than once before, in which case you don't need LTE or DVB-T2. 8-VSB can do it this just as well. For mobility, this scheme wouldn't work very well anyway, switching the mobile user from one ad to another in mid stride. Instead, the idea of using the ad based on your preferences, and the IP mcast address, would work much better. We've been over this more than once. Let's not arm-wave about this stuff. > You need to stop thinking in terms of individual channels (streams) and > start thinking in terms of how websites are created from multiple servers. This is a complete non-sequitur, and a different subject, and also not one that requires any different modulation scheme. Bert ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.