Interesting Video on ATSC 3.0

Discussion in 'Over the Air TV By RabbitEars.Info' started by Scott Greczkowski, May 13, 2016.

  1. So out of the one side of their mouth the pitch up all the wonderful things they can do for video and audio while the other side of their gob is bragging up how they are going to use a lot of bandwidth for transmitting other kinds of data. In design and manufacturing we call this the "Infinite Capacity Model".
     
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  2. That was true of many HD sets before that standard was fully developed.
     
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  3. Who is to say what real-world use will deliver? Many of the articles that you referenced were written based on early limited testing or theoretical capacities rather than real-world performance in a cozy TV band.
    Not so much alternative facts as a different perspective. The "facts" that you offer in your links are not necessarily proven in the crucible of reality where DTV and ATSC 3.0 stations are operating side-by-side (on adjacent frequencies). Lest we not forget, the analog stations that don't get whacked as a result of the repack will have until 12 months after the repack is completed to transition to digital.
    Forward Error Correction (FEC, what they use to make a broadcast "robust") is something they probably won't be able to scrimp on at least until all of the other modulation schemes are gone, wouldn't you think? Is this 25MBps rate that they quote the PHY rate or the actual data rate? Because TCP/IP is in play, the distinction is very important. For their part, the ATSC seems to be avoiding specific bandwidth numbers and stating in A/322 that the supported range of PHY bandwidths runs all the way from 1MBps to 57MBps. Who knows for certain what the real world will hand them?
    Netflix and Amazon are streaming content that is painstakingly compressed to at or near the theoretical limits of the compression scheme. TV stations, if they are modulating multiple channels with adaptive compression, don't have that going for them; they're stuck with whatever real-time re-compression they can afford.
    When you find something from a broadcast engineering source rather than someone who attended a seminar sponsored by the proponents of ATSC 3.0, you'll let me know, yes? The article speaks of the remaining ATSC 3.0 component standards being approved by the end of 2016? Is that a fact?

    The sportsvideo article (from October of 2015) also speaks to needing to fit the UHD content into 16-17Mbps and if that's what Netflix and Amazon need for their ideally compressed content. Is there an inconsistency in the facts that you've offered?

    Does any of this consider the other side of ATSC 3.0 that Bluegras' link speaks to? Will Sinclair and Nexstar wait for NTSC and DTV to go away before they start using this apparently high-value data bandwidth?

    In answer to your question about what I think the future holds, I believe that ATSC 3.0 will fail to gain traction without a gubmint mandate. I don't think that ATSC 3.0 in and of itself is a bad idea, just that it won't be able to deliver what it needs to deliver given the post-repack bandwidth. I wonder how willing the FCC is going to be to issue ATSC 3.0 licenses if they haven't successfully repacked a few markets. We must not ignore the fact that DTV is the mandated standard until it is replaced.
     
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  4. Outside of Vizio, who are you counting?
     
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  5. ATSC3.0 signal strength-service. FCC ATSC A/53 minimum Field strength requirement of,41:dBu the atsc planning factors are based on a fixed !!!outdoor !!!antenna hight of 30Ft and gain of 6,dB for UHF(10,DVD gain with 4,db down lead loss and a c/n,Of,15dB from hear a appropriate corrections, DIELECTRIC. com
     
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