My two year old Toshiba 56H80 is supposed to natively display 480i, 480p, and 1080i. I want to purchase (for OTA use)the Samsung SIR-T151 set top box that outputs 480i, 480p, 720p, and 1080i. If the Samsung receives and outputs a 720p signal, what will my TV do with the 720p signal? Will it convert it to 480p or 1080i? Can I only use the set top box to receive and output the signals that my TV will accept? Can the set top box receive a signal in 720p and then convert it to something that my TV will accept? I'm a bit confused about what box is doing what!