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随着电视的发展,广播电视已发展到电视直播卫星(DBS)的实用阶段。国外现行DBS上采用了多工模拟分量电视制式Multiplexed Analogue Components缩写MAC,并已发展了C-MAC、B-MAC、D_2-MAC等不同的类型。本文拟对MAC作一介绍,并分别对三种型式进行叙述。一、什么是MAC多工模拟分量电视制式 MAC与现行的电视制式不同的是对电视伴音信号、同步信号、色差信号和亮度信号采用时分复用传输,而不是在基带上采用频分复用,从而取消了副载波。MAC电视行结构如图1。
With the development of television, radio and television have evolved to the practical stage of television direct broadcast satellite (DBS). Foreign existing DBS uses a multiplex analog multiplexer system multiplexed analogue components abbreviation MAC, and has developed C-MAC, B-MAC, D_2-MAC and other different types. This article intends to make an introduction to the MAC, and separately describes the three types. First, what is the MAC multi-tasking analog component TV system MAC Unlike the current television system is the TV sound signal, the synchronization signal, color difference signal and brightness signal using time-division multiplexing transmission, rather than using baseband multiplexing, Subcarriers are thus canceled. MAC TV line structure shown in Figure 1.