NISC compatible two-channel transmission apparatus for enhanced definition television

摘要: An apparatus for encoding and transmitting video signals including a circuit separating the into two complementary processing in separate transmission paths; first of paths, portion one corresponding to standard signal; this over channel; second dividing other consecutive intervals, each interval having predetermined time duration; delaying every intervals such that signal appear simultaneously; expanding pairs by factor thereby reducing bandwidth thereof one-half; amplitude modulating quadrature pair onto carrier frequency located middle band; modulated channel. receiving encoded high definition television is also provided includes inversely decoding on channel, combining output circuits.