最近市场上出现了一种名为“变频彩电”的新产品,引起了人们的关注。实际上,所说的“变频”,是指“改变扫描频率”。普通电视机采用的是场扫描频率为50Hz的隔行扫描方式,即将一幅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, Recently appeared on the market called “frequency of color TV,” the new product, has aroused people’s attention. In fact, the “frequency conversion” refers to “change the scanning frequency.” Common TV uses a field scan frequency of 50Hz interlaced scanning, a complete picture is divided into two passes to complete the scan, each scan is called a field. The first game only scan odd lines, namely 1,3,5,7 ...... and so on,