说明：  语音延长、变速处理程序，实现语音信号时域延长； 主要步骤是先对原始语音信号进行加窗，再对加窗后的语音信号进行时域扩展； 以上处理之后语音信号可能会带进新的噪声，所以再对处理后的语音信号，使用FIR滤波器进行去噪处理。
(Voice extending process, extending the time-domain voice signal The first major step is added to the original speech signal window, and then the windowed speech signal after the time-domain extension After the above process may be brought into the new speech signal noise, so again the speech signal processing, the use of FIR filters for denoising.)