语音信号滤波程序（低通、带通、多带通、fft卷积滤波 自己动手做的-Voice signal filtering process (low-pass, band-pass, multi-band-pass, fft convolution filtering

数学运算，包括加减乘除。并检查运算结果是否正确，如果不正确进行批改。全过程进行语音提示。-Math, including addition and subtraction multiplication and division. And check the operation result is correct, if not correctly marking. The whole process of voice prompts.