Compatible color transmission and European modulation methods

Attempts are now under way in Europe to formulate standards for color television transmission. A number of methods have been devised for the transmission of the chrominance and luminance color signals. These techniques are all characterized by signal separation, the use of difference signals, and inter-leaved frequency bands; in other words, they are all based on the National Television System Committee proposals adopted when a standardized color television system was established for the United States some years ago. Their differences lie only in the means employed for subcarrier modulation and demodulation.