code: def getLPF(signalNeeded):
      midi_note = int(float(signalNeeded[-2:]))
  
      fc = 440.0 * np.power(semitone, midi_note)
      LPF = LowPass(sampleRate=fs, cutoffFrequency=fc)
      signal = essentia.array(LPF(getWhiteNoise()))
      # Normalization
      signal = signal / max(signal)
  
      return signal
  
file_path: essentia/test/src/qa/hpcp/test_hpcp_generatesignals.py
imports: import random
  import numpy
  from scipy.signal import spectrogram
  import essentia
  from essentia.standard import *
  from test_hpcp_parameters import *
label_desc: Use image node_id 5 for calling a global function with example usage: getLPF(signalNeeded) and returns: signal