Spectrum compatible high definition television

The spectrum compatible high definition television (SC-HDTV) system achieves the encoding of a 28.9 MHz source signal for transmission over a 6 MHz channel in the terrestrial TV broadcasting bands. The signal format reduces mutual interference between existing NTSC broadcasts and the high definition broadcasts, and therefore significant amounts of currently unused spectrum space can be used for simulcasting SC-HDTV. A concise description of the system is followed by a discussion of aspects of special interest to the terrestrial broadcaster