http://www.engadget....-qam-and-8-vsb/ HD 101: What is ATSC, PSIP, QAM, and 8-VSB? what HD broadcasts take up what HD broadcasts take up HD 101: What is ATSC, PSIP, QAM, and 8-VSB? HD 101: What is ATSC, PSIP, QAM, and 8-VSB?