Biquad Filter Implementation

• Original code by Nigel Redmon (http://www.earlevel.com/main/2012/11/26/biquad-c-source-code/)

This is an implementation of a Biquad filter implemented as an Arduino library.

Supported filter types:

• Low Pass
• High Pass
• Band Pass
• Notch
• Peaking
• Low Shelf
• High Shelf

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Methods:

• Constructors

  Biquad(); Biquad(int type, double Fc, double Q, double peakGainDB);

• Destructor

  ~Biquad();

• Configure the filter

  void setBiquad(int type, double Fc, double Q, double peakGain);

• Same as above but broken into separate parts

  void setType(int type); void setQ(double Q); void setFc(double Fc); void setPeakGain(double peakGainDB);

• Process a sample and return the filtered result

  float process(float in);