Pulsed Envelope Detection of Color Signals

The paper deals with a method for synchronous detection employing half-wave rectifiers, rather than product demodulators, for the decoding of NTSC color signals. Two basic circuits are presented illustrating the balanced and unbalanced envelope detector and using conventional diodes and triodes, respectively. The ultimate phase accuracy is found to be ± 2 degrees for the unbalanced type, and better than ± 1 degree for the balanced type. However, these errors occur only at specific angles and vanish on others.