Scientific paper ID 2049 : 2020/3

The proposed report considers an approach to change the shape of the transmitted signal in order to compensate for the linear and veline distortions due to the influence of the propagation medium. The implementation of the approach is carried out by including linear filters in the transmitter and receiver. The two filters are four-terminal, whose transmission functions must meet certain conditions. The paper derives dependences for the optimal transmission coefficient and attenuation of the considered filters for the case of a linear communication channel with constant parameters and white noise impact. Possible circuit solutions of physically feasible four-poles with a frequency response close to the optimal one are analyzed. Dependences on the transmission coefficient and the attenuation of the speech signal transmission are obtained. In the Mathcad environment, calculations were made and the frequency characteristics for a signal transmitted over a telephone channel with a carrier frequency were obtained.

It has been shown that the filters in question must have a sharp change in the attenuation in the carrier frequency range.