code: def audioread(filename):
      
      try:
          if '.wav' in filename.lower():
              fs, signal = wv.read(filename)
          elif '.call' in filename.lower():
              with open(filename, 'rb') as f:
                  signal = np.fromfile(f, dtype=np.int16)
              fs = 333333
          else:
              raise IOError("Unsupported audio format for file: {}".format(filename))
      except:
          print u"Problem reading wav file"
          raise
      signal = signal.astype(float)
      return fs, signal
docs: Reads an audio signal from file.
  
      Supported formats : wav
  
      :param filename: filename of the audiofile to load
      :type filename: str
      :returns: int, numpy.ndarray -- samplerate, array containing the audio signal