disp_mp3.py 文件源码

def get_noise(start):
    # read audio samples
    input_data = read('junk.wav')
    audio_in = input_data[1]
    samples = len(audio_in)
    intvl = (samples-start)/seg
    k = start
    sum_data = numpy.zeros(seg)
    for i in xrange(intvl):
        buffer_data = []
        for j in xrange(seg):
            buffer_data.append(audio_in[k])
            k = k+1
        cbuffer_out = fft(buffer_data)
        for j in xrange(seg):
            sq = abs(cbuffer_out[j])**2.0
            sum_data[j] = sum_data[j]+sq

    for j in xrange(seg):
        sum_data[j] = sqrt(sum_data[j]/intvl)
    return sum_data