A method and apparatus for removing national television system committee (NTSC) signals from a broadcasted datastream including advanced television system committee (ATSC) signals are provided. The apparatus includes an NTSC signal removing unit for removing the NTSC signal from an input signal with...http://www.google.com/patents/US7030901?utm_source=gb-gplus-sharePatent US7030901 - Methods and apparatus for removing NTSC signals from a digital television signal
