Carry and Inversion of the Spectrum

At processing signals in technics of communication there is a number of the problems connected to transformation of spectral of signals. Some from them are solved with the help of a digital filtration. It is possible to allocate the problems demanding moving of a spectrum of a signal on an axis of frequencies into separate group. Such transformations of a signal are typical in technics of multichannel communication at formation of a group signal with frequency division of channels (FDC) from separate channel signals or at allocation of separate channel signals from a group signal with FDC. Feature of the specified processing is that the peak spectrum of a signal practically does not change. Position of a spectrum on an axis of frequencies varies only