(Multiplexed Analogue Components, MAC) TV transmission system, pioneered in the UK in the early 1980s, in which the colour signals are time division multiplexed, thus, interference between chrominance and luminance does not occur as in PAL. In the D2-MAC version, sound is carried as digital data sent in a duobinary form (hence the "D" letter) at 10.125 Mbits/s.