[opendtv] Re: [opendtv]
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 07 Jul 2005 18:33:21 -0700
Thanks the clarification Mark.
This supports my suggestion that the ATSC restrictions on EVSB may not
be "enforceable".
----- Original Message -----
From: "Mark Aitken" <maitken@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Thursday, July 07, 2005 2:11 PM
Subject: [opendtv] Re: [opendtv]
> Based on a resent response (letter) from the FCC regarding a specific
> matter, the FCC has expressed that on a practical level, if a
> Broadcaster uses E-VSB (part of the current ATSC Standard A/53C with
> Amendment No. 1 and Corrigendum No. 1: ATSC Digital Television Standard,
> Rev. C.) the only concern they would have would be if there was no
> "normal" VSB available for minimum content reception. Otherwise, one can
> use E-VSB today without an STA (but notice would be appreciated).
> There are other promising methods being reviewed inside ATSC activities
> that may lend well to helping resolve concerns in some areas of ATSC
> performance. Join the ATSC process (or at least participate...you only
> need be a member to vote if you have direct and material interest in the
> activities.) if you want to know more...
>
> Manfredi, Albert E wrote:
>
>>John Shutt wrote:
>>
>>
>>
>>>If the FCC adopts ATSC A/53C in it's entirety as law, as
>>>they have with A/53B, then yes, it can be enforced. Or
>>>at least amendment 1 paragraph 5.6.1 can be enforced:
>>>
>>>"Limits have been defined for the maximum bitrate in the
>>>Enhanced (E-VSB) service.
>>>
>>>"At all times, the quality of video in the main stream
>>>shall be equal to or better than the equivalent program
>>>in the Enhanced stream. In the event that the
>>>programming is different in the main and Enhanced streams,
>>>a higher resolution format is deemed to be higher quality.
>>>
>>>"Additionally, during premium programming times, the
>>>maximum bitrate in the enhanced (EVSB) stream shall be 3
>>>Mbps out of the total 19.4 Mbps channel capacity."
>>>
>>>
>>
>>That text, IIRC all of it, was also there in the previous
>>candidate standard. It's logical, I think. EVSB is meant to
>>be a hierarchical modulation sort of service rather than a
>>complete replacement of the 19.3 Mb/s channel. And even
>>then, the ATSC seems to think it's okay to cut the capacity
>>down to 8.5 or 4.3 Mb/s total, off prime time.
>>
>>The nice thing about E8-VSB is the way it permits very
>>narrow robust channels to be created, taking away as little
>>as possible from the wide stream capacity. It gives a lot
>>of granularity in that way. On the other hand, it does not
>>allow for fine tuning of the robustness of the whole 6 MHz
>>band. That could have been done by directly changing the
>>FEC used in the band, but such a scheme would not have been
>>backward compatible. EVSB had to be layered over the 8-VSB,
>>2/3 trellis, and RS[208,188] FEC that was already there.
>>
>>Anyway, it's still IMO well suited to the task you
>>suggested. But here too, some field trials would be nice.
>>
>>Bert
>>
>>
>>
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>>
>
> --
>
> Regards,
> Mark A. Aitken Director, Advanced Technology
>
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