Connectionist Temporal Classification （CTC）算法解释
https://www.jianshu.com/p/0cca89f64987
语音中响度，音调与音色的影响因素
https://blog.csdn.net/qq_37385726/article/details/89176142
GMM模型与EM算法
https://blog.csdn.net/jinping_shi/article/details/59613054
语音的基本概念：语音识别所有概念
https://blog.csdn.net/zouxy09/article/details/7941055
