init

Source/EqualizerDSP.h

@@ -22,12 +22,22 @@ struct FilterBand
 
     void prepare(double sampleRate, int blockSize);
     void reset();
+    // Sets the desired (target) values; the coefficients are then smoothed in
+    // `process` to avoid zipper noise when a slider is dragged.
+    void setTargets(float gain, float freq, float q);
     void process(juce::dsp::AudioBlock<float>& block);
 
     using Filter = juce::dsp::IIR::Filter<float>;
     using Coeffs  = juce::dsp::IIR::Coefficients<float>;
 
     Filter left, right;
+
+private:
+    void updateCoeffs();
+
+    double sampleRate = 44100.0;
+    float targetGain = 0.0f, targetFreq = 1000.0f, targetQ = 1.0f;
+    float curGain = 0.0f, curFreq = 1000.0f, curQ = 1.0f;
 };
 
 // Computes the total summed magnitude response (in dB) of a series filter chain