Fluctuation noise in two forms of the N.T.S.C. colour television system

A recently proposed modification to the coding of N.T.S.C. type colour television claims to offer some improvements in the picture displayed by both colour and black-and-white receivers. The effects of fluctuation noise in colour receivers are investigated for both the modified system and the normal form of N.T.S.C. system. The analysis assumes that ¿flat-spectrum¿ noise is added to the signal at a point prior to decoding in the receiver, and the visibility of this noise is calculated for a series of test colours; the results given include allowance for the reduction of receiver ratio by ambient light falling upon the screen. It is shown that both systems have a substantially similar sensitivity to fluctuation noise. These findings are discussed in the light of experiments carried out in the USA and Britain.