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D2-MAC was created to solve D-MAC's bandwidth problem on European cable systems. * D2-MAC uses half the data rate of D-MAC * D2-MAC has a reduced vision bandwidth, about 1/2 that of D-MAC. * D2-MAC retains most of the quality of a D-MAC signal—but consumes only 5 MHz of bandwidth. == Technical details == MAC transmits luminance and chrominance data separately in time rather than separately in frequency (as other analog television formats do, such as composite video). Audio and Scrambling (selective access) * Audio, in a format similar to NICAM was transmitted digitally rather than as an FM sub-carrier. * The MAC standard included a standard scrambling system, EuroCrypt, a precursor to the standard DVB-CSA encryption system. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「D2-MAC」の詳細全文を読む スポンサード リンク
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