C-MAC


C-MAC is the variant approved by the European Broadcasting Union for satellite transmissions. The digital information is modulated using 2-4PSK, a variation of quadrature PSK where only two of the phaser angles are used.
E-MAC is 16:9 version of C-MAC. Originally E-MAC was designed for 15:9 pictures, it later adopted the 16:9 aspect ratio.
MAC transmits luminance and chrominance data separately in time rather than separately in frequency.
Audio and Scrambling