说明：  本系列实验即面向语音识别基本任务，由浅入深，循序渐进地设计完善语音识别系统，包括时域法、频域法、说话人识别三个具体实验。
(This series of experiments is to face the basic task of speech recognition, design and improve the speech recognition system step by step, including three specific experiments: time-domain method, frequency-domain method and speaker recognition.)