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目前世界上彩色电视广播,广泛采用了NTSC、PAL和SECAM三种制式。彩色电视的制式就是指两个色差信号(R-Y)和(B-Y)调制彩色副载波所采用的方式。彩色电视三种制式的主要特点如下: 一、NTSC制NTSC制是美国国家电视制式。美国于1953年12月正式广播,是世界上彩色电视广播最早的国家。用NTSC制广播的国家还有日本(1960年9月)等国家。NTSC制,即正交平衡调幅制,就是把两个色差信号分别在频率相同、相位差90°的两个副载波上平衡调幅,把抑制副载波后的两个色度信号分量正交矢量相加得到色度信号,再与亮度信号相加得到彩色全电视
The world’s color television broadcasting, widely used in NTSC, PAL and SECAM three formats. The color TV system refers to the two color difference signals (R-Y) and (B-Y) modulation color subcarrier used. Color TV three main features are as follows: First, NTSC NTSC system is the United States national television standard. The United States officially broadcast in December 1953 and is the earliest country in the world for color television broadcasting. Countries broadcasting NTSC also include Japan (September 1960) and other countries. The NTSC system, that is, the quadrature balance AM system, balances the two color difference signals on the two subcarriers with the same frequency and a 90 ° phase difference, respectively, and balances the two chrominance signal components orthogonal vector phase Add the chrominance signal, and then add the luminance signal to get the color full TV