text: #ifndef __FILTER_H__
  #define __FILTER_H__
  
  void LPF2pSetCutoffFreq_1(float sample_freq, float cutoff_freq);
  float LPF2pApply_1(float sample);
  void LPF2pSetCutoffFreq_2(float sample_freq, float cutoff_freq);
  float LPF2pApply_2(float sample);
  void LPF2pSetCutoffFreq_3(float sample_freq, float cutoff_freq);
  float LPF2pApply_3(float sample);
  void LPF2pSetCutoffFreq_4(float sample_freq, float cutoff_freq);
  float LPF2pApply_4(float sample);
  void LPF2pSetCutoffFreq_5(float sample_freq, float cutoff_freq);
  float LPF2pApply_5(float sample);
  void LPF2pSetCutoffFreq_6(float sample_freq, float cutoff_freq);
  float LPF2pApply_6(float sample);
  
  #endif
  
  