I'm a n00b to HDTV as I've owned a HDTV capable set for a year now but have never fed it anything more than a standard 480i signal. Today Comcast is coming over to install their HDTV converter which will give me the standard network channels in HD. I have a 4:3 TV and know that true HD should be in 16:9. What will I see when I get this converter hooked up? Will I see signal originally filmed at 4:3 sent at 16:9, causing my to have black bars on all 4 sides?