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DirecTV National HD Listing/Maps Discussion Thread (Technical - Not Anticipation)

Discussion in 'DIRECTV Programming' started by Sixto, May 29, 2012.

  1. Jun 5, 2012 #101 of 653
    P Smith

    P Smith Mr. FixAnything

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    That's right - there are many combinations of modulation and FEC for the mentioned tpns. I'm not thinking, :) just reading lines on a palm of the system, ie. system tables.
     
  2. Jun 5, 2012 #102 of 653
    Sixto

    Sixto Well-Known Member

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    Of the types listed QPSK 3/5 35 Mbps, QPSK 2/3 39 Mbps, QPSK 4/5 47 Mbps, 8PSK 3/5 52 Mbps ... how many are you seeing, and what's the majority if there is one?

    Just D10 TP1-14, D11 TP1-14, D12 TP11-19.
     
  3. Jun 5, 2012 #103 of 653
    Sixto

    Sixto Well-Known Member

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    Thank you.
     
  4. Jun 5, 2012 #104 of 653
    Sixto

    Sixto Well-Known Member

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    Thanks again P.

    Looked through the great data you provided ... D10 (1-14), D11 (1-14) and D12 (9-24) all show QPSK 2/3 39Mbps.
     
  5. Jun 5, 2012 #105 of 653
    georule

    georule Hall Of Fame

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    The first several weeks (few months?) of AMCHD on D* wasn't just soft --it was jerky/artifacty. Badly. Somebody moved their head too fast and it did it. Elevator door closings (common on Mad Men) were a total stutter-fest.
     
  6. Jun 5, 2012 #106 of 653
    georule

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    Hardware acceleration still has to have a software layer and available memory to access it, and optimizing that software layer can still provide gains in efficiency or performance. What I'm not sure of, is whether these new efficiencies provided by the 8190 at the encode end imply new load on the decode end. Maybe, maybe not. The engineering document linked upstream certainly does not state or imply that it would, and it appears to have been written more from an engineering perspective than a marketing perspective, so I'd think it'd have gotten mentioned if it did. Which is a long way of saying, I'm starting to back-off on that point. :D

    A general purpose CPU is hardware acceleration too. . . it just doesn't do the stuff you want it to do in this case as fast as special purpose hardware can do it. But even that is changing as "general purpose" CPU manufacturers are incorporating more and more video function-specific blocks of hardware inside their general purpose CPUs.
     
  7. Jun 5, 2012 #107 of 653
    HoTat2

    HoTat2 Hall Of Fame

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    Los...
    I thought 8-PSK modulation were only used on the Ka-band spotbeams for now at least?

    Because their higher PFD beam footprint compensates for the loss in signal robustness by going to a higher level modulation.

    Ka CONUS beams still all use QPSK though due to their lower PFD footprint.
     
  8. Jun 5, 2012 #108 of 653
    P Smith

    P Smith Mr. FixAnything

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    I recall the modes changing from time to time.
    There are hundreds lines (tpns) in system table ... I'll check June's version soon.

    EDIT. Current tables does show same parameters for these tpns: DVB-S2 QPSK 30000 2/3
     
  9. Jun 5, 2012 #109 of 653
    cypherx

    cypherx Hall Of Fame

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    PA - Berks...
    Wow 39mbps that's it? Very close to Cable's 38.8 Mbps. So when cable goes MPEG4 they should get 5 to 6 channels a QAM. Looks like Verizon Fios added 10 new Spanish HD channels but only uses 12Mhz (2 QAM channels) to do so. Cablevision and Blue Ridge Cable have been squeezing some 4 MPEG2 HD's in 38mbps and Comcast, TWC, Service Electric and others have only gone as far as 3 HD's per 38mbps.

    Point is 6 at MPEG4 should be easy at that rate. I wouldn't be surprised if 7 HD's could fit if they were all 720p. Or maybe 6HD + 1 SD since they like to overcompress SD anyway.
     
  10. Jun 5, 2012 #110 of 653
    P Smith

    P Smith Mr. FixAnything

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    If it will be 1024QAM, then the bitrate will go much higher.
     
  11. Jun 5, 2012 #111 of 653
    Shades228

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    This was a test setup not a prep for launch. If there were that many channels coming you would have heard something by now. That's not to say some things aren't in the works though.
     
  12. Jun 5, 2012 #112 of 653
    P Smith

    P Smith Mr. FixAnything

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    How many channels could be squeezed into one transponder.
     
  13. Jun 6, 2012 #113 of 653
    adkinsjm

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    Five to six to keep the same quality as is being shown.
     
  14. Jun 6, 2012 #114 of 653
    Sixto

    Sixto Well-Known Member

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  15. Jun 6, 2012 #115 of 653
    Sixto

    Sixto Well-Known Member

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    Wow, it's more then re-arranging. They filled up D12 TP9 & TP10!
     
  16. Jun 6, 2012 #116 of 653
    Sixto

    Sixto Well-Known Member

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    They did much.

    They filled up D12 transponders 9 & 10. These were the two transponders that were in test last week. Well, we now know why. They filled them up.

    They added a 6th HD to D12 TP13.

    They used that n3D slot on D12 Tp10.

    And most of everything came from D10. (There was that propulsion issue with D10.
     
  17. Jun 6, 2012 #117 of 653
    Sixto

    Sixto Well-Known Member

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    The more I analyze this ...

    They freed up D10 transponders 11 & 12, and parts of 3 & 13.

    Very interesting.

    Assuming that there's no issue with D10, this is very good news.

    Lots of free space now, assuming that they use it for mainstream HD, and there's no issue with D10.
     
  18. Jun 6, 2012 #118 of 653
    P Smith

    P Smith Mr. FixAnything

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    I have a feeling of 'deja vu' ... same movements (cramp more channels) as dish did a few years ago. If you remember DishLite campaign...
    It could happen invisible to all of us, just unfortunate for these 'conspirators' - the site's activists bringing 'secrets' to public eyes. I'm pretty sure - regular consumers (99.75%) wouldn't notice the changes and 100% would just don't care. If I'm correct then it would explain why DTV gave us no official statement of the serious changes.
     
  19. Jun 6, 2012 #119 of 653
    Sixto

    Sixto Well-Known Member

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    Or they may really have upgraded technology with no noticeable change in quality.
     
  20. Jun 6, 2012 #120 of 653
    P Smith

    P Smith Mr. FixAnything

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    If it's true there should be public statement - it would be positive moment for an image the company.
     

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