code: def deemphasis(
      *, x: np.ndarray = None, coef: float = 0.97, **kwargs
  ) -> np.ndarray:
      """Reverse pre-emphasis."""
      if coef == 0:
          raise RuntimeError(" [!] Preemphasis is set 0.0.")
      return scipy.signal.lfilter([1], [1, -coef], x)
  
imports: from io import BytesIO
  from typing import Tuple
  import librosa
  import numpy
  import scipy
  import soundfile
  from librosa import magphase, pyin
label_desc: Use image node_id 8 for calling a global function with example usage: deemphasis() and returns: scipy