Effect of Nonlinear Transmission Elements on the Quality of Television Sound using the Two-carrier System.

When using the two-carrier system for the transmission of two television sound signals, interference may occur, especially in the second sound channel, in the presence of particular picture signals because of the nonlinear behavior of the transmission elements and that of the domestic receivers. The signal-to-interference ratio of the sound channels for test signals was calculated and measured as a function of the intermodulation separation of the transmission paths. It was possible to evaluate the interference occuring with program signals on the basis of a series of measurements and to derive the demands made on the transmission paths.