Ответ: "Blue saving"
Вот весь контекст раздельчика:
"19.6 BLUE SAVING
Various methods of reducing the bandwidth required by colour television have been suggested, one of which we may call ‘blue saving’. The human eye is able to distinguish fine detail illuminated by red or green light much better than when blue light is used. But, in a colour television system, it is only the fine detail that results in the higher modulating frequencies being used. Thus a picture of one thick black tree trunk seen against a white sky, will result in
modulations every time the scanning beam crosses the tree trunk, which, for each colour, will be once per line per picture, or, in a 525 line 30 picture per second system, a mere 15 750 times per second.1 But a picture of a forest of 200 tree trunks will naturally result in 200 times the number of modulations of the scanning beam, and hence a frequency of 3 150 000 times per second. Since, however, at normal viewing distances the eye is incapable of seeing the 200 tree trunks in the blue picture there is no point in transmitting them. Thus an electronic filter could be fitted somewhere in the blue channel which effectively eliminated all signals of frequencies higher than those that result in detail that is just perceptible in the blue picture at normal viewing distances. In this way the bandwidth required for the blue picture can be reduced from 5 MHz to about 1 MHz. Blue saving does not help in the field sequential system because, even if the blue picture were transmitted with reduced bandwidth, the red and green pictures would still each have to be scanned in a third of the time."
Этот "фиттинг" наверняка имеет некий проф. вариант. Подскажите, pls.