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研究了在彩色桌面出版系统中，借助现有的调幅加网ＲＩＰ，采用乘同余伪随机数序列分布点元素，实现调频加网的基本原理和技术。选用乘同余法产生伪随机数序列，探求出适合调频加网要求的乘同余随机函数的Ｘ０、Ａ、Ｍ三个参数的正确选择方法。研究表明，采用伪随机函数，对分色后的图象文件进行调频加网，再经现有的调幅加网ＲＩＰ，可实现图象的调频加网输出；通过选用不同的随机数序列起点，或选用不同的随机数序列，可保证图象中大片灰度值相同的区域不出现纹理现象。
In the color desktop publishing system, the basic principles and techniques of FM screening are introduced with the help of the existing amplitude-modulated RIP, the distributed pseudo-random number sequence with point elements. The random congruence method is used to generate pseudo-random number sequence, and the correct selection method of X0, A, M parameters of multiplicative congruence random function which is suitable for FM screening is explored. The research shows that by using pseudo-random function, the color-separated image files are FM-screened, and then the existing amplitude-modulated RIP is added to realize the FM output of the image. By selecting different random number sequence starting points, Or choose different random number sequence, can guarantee the image in a large area of the same gray value does not appear texture phenomenon.