new_contents: import numpy as np
  import scipy.signal
  from kid_readout.utils.fftfilt import fftfilt
  
  def low_pass_fir(data, num_taps=256, cutoff=1/256.,nyquist_freq=1.0,decimate_by=1):
      taps = scipy.signal.firwin(num_taps,cutoff/nyquist_freq)
      result = fftfilt(taps,data)[num_taps:]
      result = result[::decimate_by]
      return result
  
  lpf = low_pass_fir
  
  
subject: add filters module to hold commonly used filtering operations