新建文件夹
..........\1.wav
..........\3.wav
..........\main.m
..........\sfouri.m
..........\shighpassf.m
..........\sifouri.asv
..........\sifouri.m
..........\sload.m
..........\slowpassf.asv
..........\slowpassf.m
..........\squr.m
..........\ssave.asv
..........\ssave.m
..........\低通滤波.wav
..........\高通滤波.wav