[opendtv] Re: Thomson readies solutions for U.S. Digital TV broadcast transition
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 09 May 2006 20:13:52 -0400
Hi John -
I'm not sure whether I agree with anything you said but it's good to
hear your authoritative and supportive tones again. ;-)
Maybe it will get the list moving again.
- Tom
(tuner, demod, demux, decode, display, ...)
John Willkie wrote:
> It's quite sad, Bert, that your argumentive and ignorant positions have
> brought this list to the point where you are the only person posting.
>
> Ignorant sounds harsh, no? It's appropriate, especially when contemplating
> your comments (quoted verbatim below) on this item.
>
> Over a month ago, you made the same mistake I am going to address in this
> message. Mark Aitken gently tried to disabuse your lack of knowledge as to
> what an MPEG-2 decoder does and THAT IT HAS ABSOLUTEY NO ABILITY TO DECODE
> VIDEO!
>
> So, let's go back to basics. A Demod discerns an RF signal and outputs a
> data stream that can be processed by an MPEG-2 demodulator. What a
> demodulator does is to enable an audio or video decompressor to select ONE
> AND JUST ONE packet id to decompress and to pass on for audio or video
> rendering.
>
> Therefore, only a fool or the abjectly ignorant (or both) would talk about an
> MPEG-2 demodulator doing H.262 or H.264 processing. Some folks might have
> put both functions on a single die, but they charge extra for it.
>
> ANYONE who has ever contemplated THE FIRST THING about REALLY processing
> MPEG-2 packets (or who has examined the licensing situation) LEARNS about
> this in just the first few hours.
>
> Still with the basics: MPEG-2 means ISO/IEC 13818. That is divided into three
> sections: -1 for systems, -2 for video and -3 for audio. (-3 has ZERO
> relevance in the ATSC world; it isn't even referenced in the standard ATSC
> specification suite. Offhand, I can't recall the number right now for
> MPEG-2, but it's much higher than 13818.
>
> MPEG-1 is ISO/IEC 11172.
>
> The one chip solution that you are looking for has tuner, MPEG-2 demod, AC-3
> audio and MPEG-2/MPEG-4 video decompressor. It doesn't exist, but you think
> you find it everywhere.
>
> Here's a tip: comment on published specs, don't speculate on press releases.
> If there isn't a published spec, it's just spin.
>
> John Willkie
>
> -------
> Bert wrote:
> Thomson is one of the two companies selected by the NAB, for low-coast and
> high perfromance ATSC STBs.
>
> For the ATSC market, they have developed an IC, the 4300A, that incorporates
> both ATSC demod and MPEG-2 decoder. Interesting. I'm assuming that when they
> say MPEG-2, they mean H.262 algorithm only, not H.264.
>
> Next step is to also incorporate the tuner in a single chip, to further
> reduce cost, footprint, and power requirement. Althought they are already
> calling this 4300A a "one-chip solution."
>
> No mention of this at their own web site, though, that I could find. I was
> looking for more specifics.
>
> Notice that the low-cost STB they are building for the NAB/MSTV does not use
> this 4300A chip. It will have an NTSC output, composite video, and audio. So
> it's just going to be a stripped-down SDTV box. However, they are also
> planning an HDTV STB, it seems, and a receiver with USB output for PCs. Even
> though this STB does not use the 4300A, it is said to meet all the stringent
> NAB/MSTV requirements. Not bad.
>
> Bert
>
>
>
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