old_contents: from __future__ import division, print_function
  import numpy as np
  import scipy as sp
  import scipy.io.wavfile
  import general
  import filterbank
  import auditory
  import distort
  
  
  MIDFREQ = (63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000,
             1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000)
  HT_DIFFUSE = (37.5, 31.5, 26.5, 22.1, 17.9, 14.4, 11.4, 8.4, 5.8, 3.8, 2.1,
                1.0, 0.8, 1.9, 0.5, -1.5, -3.1, -4.0, -3.8, -1.8, 2.5, 6.8)
  FS = 22050.0
  
  
  def auditory_processing(signal, center_f=MIDFREQ, fs=FS):
      # Gammatone filering
      b, a, _, _, _ = auditory.gammatone_make(fs, center_f)
      y = auditory.gammatone_apply(signal, b, a)
      return general.hilbert_envelope(y)
  
  
  def bands_above_thres(x, c, fs):
      noise_rms_db = general.dbspl(x)
      # Convert to spectrum level according to ANSI 1997
      noise_spec_level_corr = noise_rms_db - 10.0 * sp.log10(sp.array(c) * 0.231)
      return noise_spec_level_corr > HT_DIFFUSE[0:len(noise_spec_level_corr)]
  
new_contents: import numpy as np
  import scipy as sp
  import scipy.io.wavfile
  import general
  import filterbank
  import auditory
  import distort
  
  
  MIDFREQ = (63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000,
             1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000)
  HT_DIFFUSE = (37.5, 31.5, 26.5, 22.1, 17.9, 14.4, 11.4, 8.4, 5.8, 3.8, 2.1,
                1.0, 0.8, 1.9, 0.5, -1.5, -3.1, -4.0, -3.8, -1.8, 2.5, 6.8)
  FS = 22050.0
  
  
  def auditory_processing(signal, center_f=MIDFREQ, fs=FS):
      # Gammatone filering
      b, a, _, _, _ = auditory.gammatone_make(fs, center_f)
      y = auditory.gammatone_apply(signal, b, a)
      return general.hilbert_envelope(y)
  
  
  def bands_above_thres(x, c, fs):
      noise_rms_db = general.dbspl(x)
      # Convert to spectrum level according to ANSI 1997
      noise_spec_level_corr = noise_rms_db - 10.0 * sp.log10(sp.array(c) * 0.231)
      return noise_spec_level_corr > HT_DIFFUSE[0:len(noise_spec_level_corr)]
  
subject: Remove __future__ references since I'm using Python 3