python中如何重采样?用scipy.signal.resample scipy.signal.resample_poly
scipy.signal.resample官方手册https://docs.scipy.org/doc/scipy/reference/generated/scipy.signal.resample.html?highlight=resample#scipy.signal.resamplescipy.signal.resample(x,num)num是int,是经过resample之后的符号长度,