I recently bought a 57" Toshiba, and have run it through my HDTV cable box. Some programming (especially PBS) is unbelievable looking, and I am assuming its being broadcast in 1080i. Other stuff is less great looking. I am wondering how the T.V. processes this? Its beiput in widescreen alright - its in "natural" mode and the screen i up - but the picture is not specatacular looking. Is it downgrading i to 480i?