docs: def IIR_filter_design(CentralFreq, bandwidth, transitionWidth, SampleFreq, GainStop=40, GainPass=0.01):
      """
      Function to calculate the coefficients of an IIR filter, 
      IMPORTANT NOTE: make_butterworth_bandpass_b_a and make_butterworth_b_a
      can produce IIR filters with higher sample rates and are prefereable
      due to this.
  
      Parameters
      ----------
      CentralFreq : float
          Central frequency of the IIR filter to be designed
      bandwidth : float
          The width of the passband to be created about the central frequency
      transitionWidth : float
          The width of the transition band between the pass-band and stop-band
      SampleFreq : float
          The sample frequency (rate) of the data to be filtered
      GainStop : float, optional
          The dB of attenuation within the stopband (i.e. outside the passband)
      GainPass : float, optional
          The dB attenuation inside the passband (ideally close to 0 for a bandpass filter)
  
      Returns
      -------
      b : ndarray
          coefficients multiplying the current and past inputs (feedforward coefficients)
      a : ndarray
          coefficients multiplying the past outputs (feedback coefficients)
      """
      NyquistFreq = SampleFreq / 2
      if (CentralFreq + bandwidth / 2 + transitionWidth > NyquistFreq):
          raise ValueError(
              "Need a higher Sample Frequency for this Central Freq, Bandwidth and transition Width")
  
      CentralFreqNormed = CentralFreq / NyquistFreq
      bandwidthNormed = bandwidth / NyquistFreq
      transitionWidthNormed = transitionWidth / NyquistFreq
      bandpass = [CentralFreqNormed - bandwidthNormed /
                  2, CentralFreqNormed + bandwidthNormed / 2]
      bandstop = [CentralFreqNormed - bandwidthNormed / 2 - transitionWidthNormed,
                  CentralFreqNormed + bandwidthNormed / 2 + transitionWidthNormed]
      print(bandpass, bandstop)
      b, a = scipy.signal.iirdesign(bandpass, bandstop, GainPass, GainStop)
      return b, a