中文说明：
录制一段个人的语音信号，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；给定滤波器的性能指标，采用双线性变换法和窗函数法设计滤波器，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；最后，设计一个信号处理系统界面。
English Description：
Record a personal voice signal and sample the recorded signal; Draw the time domain waveform and spectrum diagram of the sampled speech signal; Given the performance index of the filter, the filter is designed by bilinear transformation method and window function method, and the frequency response of the filter is drawn; Then use the filter designed by ourselves to filter the collected signal, draw the time-domain waveform and spectrum of the filtered signal, compare the signals before and after filtering, and analyze the changes of the signal; Playback voice signal; Finally, a signal processing system interface is designed