Spectrum Utilization in Color Television

The frequency spectrum of the 6-mc channel, now standard in the United States for black-and-white- or monochrome-television transmissions, may be utilized in several ways for the transmission of color-television images. The three sets of data associated with color-television systems may be transmitted by time-division multiplex, by frequency-division multiplex, or by combinations of these two methods. One of the latter methods, called "alternating lows," is discussed in some detail, and some of the working circuits for this method are presented.