【摘要】 介绍了电动轮廓仪中数字滤波的一种最新方法，其最大特点是：在轮廓信号传输过程中引起相移以及由相移导致的不对称畸变，使得计算被测信号的所有表面粗糙度参数和波度参数为可能；提出了用ＦＦＴ实现数字滤波中的卷积计算，给出了改进的快变计算公式及用汇编语言编程的具体方法。更多还原

【Abstract】 The paper introduced a newest method of the digital filters used in electric profilometers. The most great advantage of the method is that the pro-file has not phase difference and phase distortion in transmission process,then allof the roughness parameters and the wave parameters of measured surface can be computed.The paper also advanced the method to achieve the convolution through FFT in digital filters and gave the improved formula to achieve FFT as well as the detailed programming steps.更多还原