duobinär multiplexed analogue components (CATV) (D2-MAC)

D2-MAC(Duobinary Multiplexed Analogue Components) is to be regarded as an intermediate solution for high-definition televisionHDTV. It was developed in the 1980s and operated with the same bandwidth as analog terrestrial transmission.

In contrast to the PAL television standard, D2-MAC transmitted the synchronization, color and brightness signals one after the other. Since it was assumed that television signals would be transmitted digitally in the near future, the television picture was transmitted without a horizontal blanking interval, which meant that the entire 64 µs line duration could be used for the picture content. The aspect ratio of 4:3 corresponded to that of the classic television picture. The interlaced scanning method was also retained.

The advantage of D2-MAC, which evolved from and is compatible with HD-MAC, is the lack of cross-color interference.

The interlaced signal of D2-MAC, like that of analog television, had 64 µs, of which the first 10.32 µs was used for data and the sync signal. This was followed by a duty cycle gap of 0.74 µs with a clamping level of 0.5 V, after which the color difference signal was transmitted with a duration of 17.23 µs, and then the luminance signal with 34.2 µs.