code: def encode_16bits(x):
      return np.clip(x * 2**15, -(2**15), 2**15 - 1).astype(
          np.int16
      )
  
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 30 for calling the AudioProcessor obj's underlying member method code with example usage: obj.encode_16bits(x) and returns: np