A precoded N-level HDTV digital video characterized by a sampling rate fs substantially equal to 3/2 the NTSC color subcarrier frequency is modulated for transmission on a carrier signal having a frequency substantially mid-way between the picture carrier and color subcarrier of an NTSC co-channel. The...http://www.google.fr/patents/US5121203?utm_source=gb-gplus-shareBrevet US5121203 - HDTV transmission system with reduced NTSC CO-channel interference
HDTV transmission system with reduced NTSC CO-channel interference
