"Gray Scale Sync" is a new technology which can not only implement the "So-und-in-Sync" technique effectively but also improve the signal to noise ratio of the TV picture by 3 dB. Based on the study of the digital processing of the TV sync and sound signals

we have developed a "Gray Scale Sync" equipment capable of handling the PAL format composite colour TV signals and also suitable to the reception of overdeviation signals. In this treatise

stress is laid on the explanation of the scheme and the result of the experiments.