code: def mulaw_encode(
      *, wav: np.ndarray, mulaw_qc: int, **kwargs
  ) -> np.ndarray:
      mu = 2**mulaw_qc - 1
      signal = (
          np.sign(wav) * np.log(1 + mu * np.abs(wav)) / np.log(1.0 + mu)
      )
      signal = (signal + 1) / 2 * mu + 0.5
      return np.floor(
          signal,
      )
  
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 28 for calling a global function with example usage: mulaw_encode() and returns: np