BiquadFilter.h

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#pragma once
 
namespace krotos
{
    //==============================================================================
    class BiquadFilter
    {
      public:
        enum FilterType
        {
            HighShelfDeMan = 0,
            HighPassDeMan,
            NUM_FILTMODES
        };
 
        BiquadFilter();
 
        void configure(double rate, FilterType filter_type);
 
        float processSample(float x);
 
      private:
        float a1, a2;
        float b0, b1, b2;
 
        float d0_1, d1_1;
 
        bool configured = false;
    };
} // namespace krotos