Re: Television systems by Relocation

In article <pan.2006.07.29.23.54.13.245016.309@xxxxxxxxxxxxxxx>,
the Tinfoil Hat of Reason <ibvtug-xnzcss@xxxxxxxxxxxxxxx> wrote:
[I wrote:]
Of course, all this will be going away soon, and we'll be left with
ATSC, DVB-T, ISDB-T, DMB, DVB-C, OpenCable/256QAM, DVB-S, and probably
more than I've forgotten.

Variations on mpeg2/4?

Only insofar as you could call DVD and Eureka-147 "variations on
MPEG-2".

They all have MPEG-2 FlexMux buried somewhere in the encoding, yes.
It's about the only thing they agree on. ATSC uses 8VSB (or 16VSB for
the never-used cable-TV version) modulation, with MPEG-2 video and
Dolby Labs AC-3 (aka ATSC A/52) audio. The original DVB family all
used MPEG-2 video and two-channel audio, IIRC, but newer DVB standards
have moved to MPEG-4 with AAC audio; DVB-T uses COFDM with some large
number of carriers (256?) and I'm not sure about the others. DMB is a
successor to DVB-H so it probably sits on top of GPRS.
OpenCable/256QAM, unsurprisingly, sits on top of 256QAM, and has
conditional-access crap in it similar to DVB-S only different (one
presumes due to NIH). ISDB-T is related to DVB-T but different in
ways I do not understand, because the Japanese have to protect the
home market.

-GAWollman

--
Garrett A. Wollman | As the Constitution endures, persons in every
wollman@xxxxxxxxxxxxx | generation can invoke its principles in their own
Opinions not those | search for greater freedom.
of MIT or CSAIL. | - A. Kennedy, Lawrence v. Texas, 539 U.S. 558 (2003)
.

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