变声

http://www.docin.com/p-1880052993.html

https://blog.csdn.net/fz19950924/article/details/80649139

https://blog.csdn.net/wkw1125/article/details/63807128

https://blog.csdn.net/wangjianzhongfj/article/details/72860982

http://blog.sina.com.cn/s/blog_65d639d50100zd0b.html

http://wenku.it168.com/d_001360667.shtml

https://blog.csdn.net/qicheng777/article/details/71577317

https://blog.csdn.net/qq_29108585/article/details/50321595