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最近市场上出现了一种名为“变频彩电”的新产品,引起人们的关注。什么是变频彩电?它有什么优点?实际上,这里所说的“变频”,是指“改变扫描频率”。普通的电视采用的是场扫描频率为50Hz的隔行扫描方式,即将一帧完整的画面分两遍扫描来完成,每一遍扫描称为一个场。第一场只扫描奇数行,即1、3、5、7……等行,称为A场;第二场只扫描偶数行,即2、4、6、8……等行,称为B场。由于人眼的视留效应,会觉得这两场信号被编织
Recently on the market there is a new product called “frequency conversion color TV”, aroused people’s attention. What is the frequency of color TV? What are its advantages? In fact, what is referred to here as “frequency” refers to “change the scanning frequency.” Common TV uses a field scanning frequency of 50Hz interlaced scanning mode, about to complete a complete picture scanning two times, each scan is called a field. The first field only scan odd lines, namely 1,3,5,7 ...... and so on, known as A field; the second field only scan even lines, that 2,4,6,8 ...... and so on, known as B field. Due to the visual effect of the human eye, we can think of these two signals being weaved