Yes and no.^^^^
What happens when a 16:9 SD signal is received on a OTA HD converter? IIRC, they have a button for aspect ratio,
I don't know if this is an unusual feature, but my Zinwell (ZRC-4502) remote does have a zoom button to change the aspect ratio on the fly. Handy feature.In the case of my RCA DTA800, the aspect ration can be changed, but only after decending into a few levels of menu.
In my experience, I haven't found this to be the case. WNED 17.2 SD has noticeably softer graphics compared with 17.1 HD. The audio is noticeably better on 17.1 as well. I much prefer the crisp picture and full sound of 17.1 even on my 32-inch CRT.The SD stream looks better when using a digital 2 analog converter box.
PID Usage Chart 0x0000 (0.13% ~ 0.02 Mbps) 0x0000 MPEG-2 Program Assocation Table 0x0030 (0.13% ~ 0.02 Mbps) 0x0030 MPEG-2 PMT for program 1 0x0031 (78.37% - 15.20 Mbps) 0x0031 MPEG-2 Video for program 1 0x0034 (2.04% ~ 0.39 Mbps) 0x0034 AC-3 Audio for program 1 0x0035 (1.02% ~ 0.20 Mbps) 0x0035 AC-3 Audio for program 1 [B][I]0x0041 (14.44% - 2.80 Mbps) 0x0041 Unknown usage 0x0044 (1.02% ~ 0.20 Mbps) 0x0044 Unknown usage 0x0045 (1.02% ~ 0.20 Mbps) 0x0045 Unknown usage[/I][/B]