code: def _amp_to_db(self, x):
      return self.spec_gain * np.log10(np.maximum(1e-5, x))
  
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 8 for calling the AudioProcessor obj's underlying member method code with example usage: obj._amp_to_db(x) and returns: unknown