D2-MAC is a satellite television transmission standard, a member of Multiplexed Analogue Components family. [1][2] It was created to solve D-MAC 's bandwidth usage by further reducing it, allowing usage of the system on cable and satellite broadcast. [3][4] It could carry four high quality (15 kHz bandwidth) sound channels [5] or eight lower qua...

A preview of actual D2-MAC signal. From left to right: digital data, chrominance and luminance with teletext packets between fields. Among the family of MAC or Multiplexed Analogue Components systems for television broadcasting, D-MAC is a reduced bandwidth variant designed for transmission down cable. [1] The data is duobinary coded with a ...

In 1985 MAC was recommended for satellite and cable broadcasts by the European Broadcasting Union (EBU), with specific variants for each medium. C-MAC/packet was intended for Direct Broadcast Satellite (DBS), D-MAC/packet for wide-band cable, and D2-MAC/packet for both for DBS and narrow-band cable. [3] [4] [5]

D2-MAC is a satellite television transmission standard, a member of Multiplexed Analogue Components family. It was created to solve D-MAC's bandwidth problem on European cable systems. * D2-MAC uses half the data rate of D-MAC (10.125 Mbit/s) * D2-MAC has a reduced vision bandwidth, about 1/2 that of D-MAC.

The D/D2-MAC (multiplexed analog component) packet system has been standardized and put into operation in Europe. This television transmission system offers excellent picture and sound quality, and compatible reception of HDTV (high-definition television) signals.

1993年12月1日 · d2-mac分组系统适用于频率调制的卫星广播和残留边带振幅调制的全透明电缆分配。 The D2-MAC packet system is suitable for satellite broadcasting with frequency modulation and for cable distribution with vestigial side- band amplitude modulation, with full transparency.

2007年10月17日 · It's astonishing to think how D/D2-Mac was the cutting edge of technology just a decade ago, with superb picture and sound quality, yet it was blown away with the digital revolution.

In D2-MAC, the analog video and digital sound are multiplexed before modulation. The modulation of subcarrier will take place after that. It is possible to use AM/VSB for cable TV and FM for satellite broadcasting. The duo-binary uses three levels of signals instead of two and reduces the bandwidth requirement by 50%. Characteristics of D2-MAC:

A new television broadcasting system perhaps destined to replace current NTSC, PAL, and SECAM standards which boasts higher-quality video and CD-quality sound, as well as the ability to simultaneously broadcast speech in several languages. The picture size conforms to the current 4:3 proportion, as well as the wide-screen-TV 16:9 proportion.

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 {10.125Mb/s} D2-MAC has a reduced vision bandwidth, about 1/2 that of D-MAC. D2-MAC retains most of the quality of a