The following definitions will hopefully clear up the any questions you may have about ATSC, NTSC, and QAM.
NTSC (National Television System Committee) - Old analog broadcast format orginally developed in 1941 and modified in 1953 for color. TVs that receive TV signals over-the-air built with NTSC tuners will require a digital-to-analog converter box to continue viewing television signals after the digital transition. Read more about High Definition programming. Read more about .
QAM (Quadrature Amplitude Modulation) Tuner - For use with subscribed television services to a cable company. TVs or set top boxes with a built-in QAM tuner are capable of receiving high definition cable programming of local channels without a cable set top box. Read more about .
Please use this thread to discuss any questions, comments, or anything related to the ATSC format, NTSC format, or QAM Tuners. Please post if you would like to add any additional information that I may have missed.