我想用巴特沃斯带通过滤wav
文件。我试图将wav
文件转换为fft
,然后应用带通滤波器,然后应用ifft
。从图形上看,它似乎有点过滤,但当我减少到输入和输出时,音频没有区别,就像过滤器不起作用一样。有错吗
# FFT - Fast Fourier Transform
frequency,data = wavfile.read('Input_sound.wav')
signalFFT = fft(data)
def butter_bandpass_filter(data, lowcut, highcut, frequency, order):
nyq = 0.5 * frequency
low = lowcut / nyq
high = highcut / nyq
b, a = butter(order, [low, high], btype='bandpass')
y = lfilter(b, a, data)
return y
funct=butter_bandpass_filter(signalFFT,2100,3400,44100,4)
filtered_sound=ifft(funct)
filtered_sound=sp.real(filtered_sound)
filtered_sound=sp.int16(filtered_sound/sp.absolute(filtered_sound).max()*32767)
wavfile.write('Filtered_ouput.wav',frequency,filtered_sound)
看看
lfilter
documentation的例子,似乎不需要执行FFT,而是直接向滤波器提供data
。那就简单多了相关问题 更多 >
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