HD-MAC was a proposed television standard by the European Commission in 1986 (MAC standard) . It was an early attempt by the EEC to provide HDTV in Europe. It was a complex mix of analogue signal (Multiplexed Analogue Components), multiplexed with digital sound. The video signal (1250 (1152 visible) lines/50 frames in aspect ratio) was encoded with a modified D2-MAC encoder. HD-MAC could be decoded by a standard D2-MAC receivers(SDTV), but in that mode only 625 (576) lines and certain artifacts… (More on Hd-mac)