Originally Posted by mrvideo
Also interesting that no one uses 8T-VSB to describe ATSC. I've only ever seen 8VSB.
Yeah, you might occasionally see a reference to it in a non abbreviated fashion as "Trellis Coded 8-Level Vestigial Sideband" though ...
Not sure, but don't think many applications, if any are using any of the various modes besides 8T-VSB - at least here in U.S. If there are any applications using some of the others, my best guess might be their useage may be quite limited. Just a guess, but Perhaps that, and since 4 letter abbreviation is shorter than 5 is why we usually see 8T-VSB referred to as 8VSB .... Heck, I usually use that abbreviation as well, even though I'm aware there is 8VSB mode possible without the trellis-coding ....
16-VSB (payoad rate= 38.57Mb/s - SNR required = 28.3db) is also accepted for use(such as for digital cable) by ATSC. However, I don't think anyone uses it, either, at least in U.S. where digital cable uses QAM, usually QAM256 I think ... Also notice that from what I can recall it seems the 16-VSB section of the newer ATSC A 53 documents are "shortened" from what they used to be ....
Which reminds me, in addition to the srignoli/Zenith paper mentioned by others ... Those interested in the details of our "DTV standard" may also want to refer to the ATSC A 53Note: A 53 Part II decribes the RF/transmission system, including 8T-VSB, or 8VSB "for short") and A54 Documents here -- Do note that E8-VSB (E-VSB) has already been added to the standard, but I don't know if anyone is actually using it, if not perhaps they're waiting for M/H or A-VSB :http://www.atsc.org/standards/a53.html
I've found the paper here quite informative as well :http://www.broadcast.net/~sbe1/8vsb/8vsb.htm
And then there are other "items" of interest as well, such as ATSC's A65C PSIP standard (which can be found from here, along with all other ATSC published standards :http://www.atsc.org/standards.html
And don't forget the ATSC recommended practices (such as A74 - Receiver Performance Guidelines), which are "used" for the CECB's :http://www.atsc.org/standards/practices.html
And lastly, the ATSC candidate standards -- perhaps we might see somthing "new" here soon, if not in the "published" standards regarding M/H (mobile handheld), A-VSB, or ATSC 2.0 :http://www.atsc.org/standards/candidate_standards.html
Note --- there is also an interesting Zenith/Sringoli paper from the late 90's which includes lots of great info on the transmission system, results from field tests, info on receiver performance/design which used to be on ATSCForum website, as I recall that's where I had downloaded it from -- It might be somewhere on the Zenith site as well, but not sure ....
Originally Posted by hphase
Read and "learn how things work."
Excellent advice, IMO ... if only more folks would understand the wisdom of it vs. 1). "skim a little", 2.)"don't think too much about it", 3.) post ... Some posts even seem to involve the reverse order of those, or a combination of #2 and #3 "all at once", or just #3 ....