录制一段自己的语音信号，时间为10s左右，并对录制的信号进行采样；画出采样后语音信号的时域波形和频谱图；采用窗函数法或双线性变换设计滤波器，并画出滤波器的频率响应；然后用自己设计的滤波器对采集的语音信号进行滤波，画出滤波后信号的时域波形和频谱，并对滤波前后的信号进行对比，分析信号的变化；回放语音信号.-Record a voice signal their time was 10s or so, and the recorded signal is sampled　draw sampled speech signal time-domain waveform and frequency spectrum　using window functions or bilinear transformation design filters, and draw filter frequency response　then use the filter of their own design collection of the voice signal filtering, to draw the filtered signal in time domain waveform and frequency spectrum, and comparing the signal before and after filtering, analysis of signal changes　playback of audio signals .