text: import wave
  import numpy as np
  
  fnames='noise.wav'
  fs=44100
  timlen=10 #sec
  
  N=fs*timlen
  nstat = np.random.RandomState()
  factScl = 0.90
  streamRand = nstat.randn(N) * factScl
  #factNrm = np.max(np.abs(streamRand))
  factNrm = 1
  streamNrm = streamRand / factNrm
  streamPeakSup = np.where( streamNrm < 1.0 , streamNrm , 1.0)
  streamPeakSup = np.where( streamPeakSup > -1.0 , streamPeakSup , -1.0)
  factFixedPoint = 32767
  stream= np.int16(streamPeakSup * factFixedPoint)
  objw = wave.Wave_write(fnames)
  objw.setnchannels(1)
  objw.setsampwidth(2)
  objw.setframerate(fs)
  objw.writeframes(stream)
  objw.close()
  