python wav的fft

要进行Python中wav文件的FFT（快速傅里叶变换），可以使用以下代码：

import wave
import struct
import numpy
from scipy import *
from pylab import *

def Plot_fft_freq_chart(filename, plot=False):
    wavefile = wave.open(filename, 'r')
    nchannels = wavefile.getnchannels()
    sample_width = wavefile.getsampwidth()
    framerate = wavefile.getframerate()
    numframes = wavefile.getnframes()
    y = numpy.zeros(numframes)
    
    for i in range(numframes):
        val = wavefile.readframes(1)
        left = val = v
    
    Fs = framerate
    
    try:
        data, freqs, bins, im = specgram(y, NFFT=1024, Fs=Fs, noverlap=900)
        mm = data<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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