Note the "polyphase" option on the end of the SoX command. This is important to preserve the pitch of the file while altering its sample rate.
注意SoX命令结尾的“polyphase”选项，在改变文件采样率时该选项对于保存文件的基调非常重要。
The output of each execution is appended to the end of the file specified by the -file option.
每次执行的输出被附加到 -file 选项指定的文件后面。
Missing from the command line are three parameters. The first two are the -i option in front of the command line and the output file name at the end of the command line.
这个命令行少了三个参数：前两个分别是命令行前面的- i选项和命令行末尾的输出文件名。
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