Multi-carrier digital signal transmitter reducing co-channel interference with an analogue television signal

摘要

The transmitter has shaping units for shaping a digital signal such that an intercarrier frequency spacing (deltaf) between adjacent digital sub-carriers (52) of the digital signal is sub-multiple of a line frequency (fl) of a preset analog TV signal. Transmission units transmit one of the sub-carriers of the digital signal at a frequency equal to addition of pv with multiplication of n and the line frequency such that a sub-set of the sub-carriers coincides with video analog rays (51) of the TV signal. The pv is main video carrier of the analog TV signal, and the n is an integer number.