Methods of Verifying Adherence to the NTSC Color Signal Specifications
Arch C. Luther · Proceedings of the IRE · 1954
A color-bar test signal is described for verification of the performance of an NTSC color television system. By measurement of the amplitudes and relative phases of a group of bar signals corresponding to saturated primary colors and their complements, it is shown that the basic composition of the multiplexed color signal may be verified. The use of a very simple demodulator for accurate measurement of phase at the 3.58-megacycle subcarrier frequency is also described.