signal_processing.py 文件源码

def stft(x, fs, framesz, hop):
    framesamp = int(framesz*fs)
    hopsamp = int(hop*fs)
    w = scipy.hanning(framesamp)
    X = scipy.array([scipy.fft(w*x[i:i+framesamp])
                     for i in range(0, len(x)-framesamp, hopsamp)])
    return X