Abstract: A plurality of SECAM color-T.V. signals are to be mixed. Each comprises a luminance component and an FM color component. For each individual signal, the color component is separated from the luminance component, frequency-demodulated, amplitude-modulated, and then superimposed upon the respective luminance component to form a frequency-multiplexed modified signal. The plurality of thusly modified signals are then mixed using a single mixing channel. The mixed luminance component and the mixed color component are separated on the basis of frequency, and the mixed color component is amplitude-demodulated, then frequency-modulated and then superimposed upon the mixed luminance component, to yield a SECAM color-T.V. signal which constitutes a mix of the original signals.