说明：  1、语音信号的采集； 2、语音信号的频谱分析； 3、数字滤波器的设计； 4、对语音信号进行滤波处理； 5、对滤波前后的语音信号频谱进行对比分析；
(1, speech signal acquisition 2, the speech signal spectrum analysis 3, digital filter design 4, on the voice signal filtering processing 5, to filter the speech signal before and after a comparative analysis of the spectrum )