如何在Python中创建白噪声信号，并用带通滤波器过滤噪声信号？

Question

我正在做一个关于语音处理的项目。我想知道如何在 Python 中创建白噪声信号，并用带通滤波器过滤噪声信号？

import pyaudio
import numpy as np
import scipy.signal as signal

CHUNK = 64 #the block size
Q = 50

pa = pyaudio.PyAudio()
stream = pa.open(format=pyaudio.paFloat32,
                            channels=1,
                            rate=44100,
                            output=True)
while True:
    noise = np.random.uniform(-1,1,CHUNK)
    b,a = signal.iirfilter(1,[2*500*(1-1/(2*Q))/44100,2*500*(1+1/(2*Q))/44100])
    output = signal.lfilter(b,a,noise)
    output.astype(np.float32)
    output = output.tobytes()
    stream.write(output)

代码对吗？和之间有什么区别signal.iirfilter和signal.butter？非常感谢。