Dkeeper: Please excuse my inexperience here.. are you saying that the tv will attempt to upscale the incoming signal to the tv's native level. In other words the tv will likely do some level of upscalling?
Sure am. It simply has to, otherwise your SD signal would only fill up the top left 2/3rds of the screen (if your TV is 720P or the top 1/4 if it's full HD). The TV itself does up or down scaling to fit incoming signals onto it's panel. As mentioned earlier they don't seem to put much emphasis on upscaling SD inputs these days so often they don't look very good on a modern 720/1080 HD set.