传统的卷积运算方法主要有图解法和公式法等，但这些方法繁琐，不易编程。
General convolution operation methods, which mainly refer to the graphics way and the expressions way, are complicated and difficult to program.
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。
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.
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