Abstract: A video signal transmitter/receiver apparatus and method is provided for automatically switching the aspect ratio at a receiving device. A video transmitter outputs a chrominance signal and a luminance signal separately, and converts the chrominance signal into a low impedance. A transistor and resistive divider network superpose a DC voltage controlled by an aspect ratio control signal on an output signal. A receiving unit inputs the chrominance signal and the luminance signal separately and comprises a discrimination circuit that detects the DC control voltage superposed on the chrominance signal.

Abstract: A color video signal dubbing system comprises a reproducing apparatus and a recording apparatus. The recorded signal is a multiplexed signal of a frequency-modulated luminance signal obtained as the result that a luminance signal separated from the color video signal frequency-modulates a carrier wave to occupy a predetermined frequency band and a frequency-converted carrier chrominance signal obtained by frequency-converting a carrier chrominance signal having a color burst signal which is separated from the color video signal to a band lower than that of the predetermined frequency band.