code: def low_cut_filter(x, fs, cutoff=70):
      """FUNCTION TO APPLY LOW CUT FILTER
  
      Args:
          x (ndarray): Waveform sequence
          fs (int): Sampling frequency
          cutoff (float): Cutoff frequency of low cut filter
  
      Return:
          (ndarray): Low cut filtered waveform sequence
      """
  
      nyquist = fs // 2
      norm_cutoff = cutoff / nyquist
  
      # low cut filter
      fil = firwin(255, norm_cutoff, pass_zero=False)
      lcf_x = lfilter(fil, 1, x)
  
      return lcf_x
  
imports: import argparse
  import fnmatch
  import multiprocessing
  import os
  import numpy
  import pysptk
  import pyworld
  import scipy
  from fastdtw import fastdtw
  from scipy.io import wavfile
  from scipy.signal import firwin, lfilter
label_desc: Use image node_id 2 for calling a global function with example usage: low_cut_filter(x, fs, cutoff) and returns: lcf_x