code: def quantize(x, bits):
      return (x + 1.0) * (2**bits - 1) / 2
  
imports: import librosa
  import soundfile
  import numpy
  import scipy.io.wavfile
  import scipy.signal
  from TTS.tts.utils.data import StandardScaler
label_desc: Use image node_id 31 for calling the AudioProcessor obj's underlying member method code with example usage: obj.quantize(x, bits) and returns: unknown