Samsung and Rohde-Schwarz were demonstrating their proposed "A-VSB" TURBO STEAM system at NAB2006.
Samsung described the STB as having dual antenna diversity capability using Maximal Ratio Diversity combining (vice switching diversity). Obviously intended for automobile (and maybe handheld) appllications.
The Samsung rep said that a proposal had been submitted to ATSC, but I don't see anything posted on the ATSC website.....or anywhere else...
The brochure (see scans) appears to describe it as E-8VSB, except they've added a "TURBO PROCESSOR" functional block between the Reed-Solomon Encoder/Interleaver and the Trellis Encoder. I added a scan of the ATSC E-8VSB spec showing the changes.
I'm going to take a wild guess and speculate that it might be some soft of TURBO CODE they've added to improve performance.
In the wide view photo, R-S provided the pair of modulators on the right: one for regular 8VSB and the other for "A-VSB".
A UHF Channel Simulator sits on top, with the monitor displaying the various parameters (see photo) for the "A-VSB" channel
(I'm not sure whether or not it was a diversity test configuration).
The Samsung "A-VSB" STB is flanked by two spectrum analyzer displays.
The one on the right shows the nearly undisturbed channel feeding the normal 8VSB mini-receiver on the right,
whereas the analyzer on the left displays the severly disturbed channel feeding the "A-VSB" mini-receiver on the left.
The extremely small size of the receiver hid many artifacts--careful viewing revealed the screen to be frequently freezing--
and I didn't hear any audio in the demo.
Nonetheless, if the simulated multipath settings are to be believed, it is barely working under extremely difficult conditions--
including short delay echo within 3 dB--and 171 mph doppler.
Enhanced VSB (E-VSB) specs were approved in 2004, which the latest specs now call E-8VSB.
Candidate specs for H.264 and VC-1 enhancements to E-8VSB are currently under consideration, but do not include TURBO STREAM.
"In the beginning" there was something called Advanced Television (ATV), with specs developed by ATSC (Advanced Television Systems Committee).
It was a huge mistake to confusingly call this new variation Advanced VSB ("A-VSB").