AnalogTapeModel

commit 42a7df9d7db8f0384d7a005acd9c080b1e03cb5d
parent a46656b00b5705530b4ba75e6228a3f114fc2dc0
Author: jatinchowdhury18 <jatinchowdhury18@gmail.com>
Date:   Mon,  6 Feb 2023 21:34:27 -0800

WowFlutter: Use SVF instead of IIR LPF for Ornstein-Uhlenbeck process (#303)


Diffstat:
M
Plugin/Source/Processors/Timing_Effects/OHProcess.h
 | 
16
++++++----------
M
Plugin/Source/Processors/Timing_Effects/WowFlutterProcessor.h
 | 
2
+-

2 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/Plugin/Source/Processors/Timing_Effects/OHProcess.h b/Plugin/Source/Processors/Timing_Effects/OHProcess.h
@@ -22,12 +22,9 @@ public:
         noiseGen.setGainLinear (1.0f / 2.33f);
         noiseGen.prepare (monoSpec);
 
-        lpf.resize ((size_t) numChannels);
-        for (auto& filt : lpf)
-        {
-            filt.prepare (spec);
-            filt.coefficients = dsp::IIR::Coefficients<float>::makeLowPass (sampleRate, 10.0f);
-        }
+        lpf.prepare (spec);
+        lpf.setCutoffFrequency (10.0f);
+        lpf.reset();
 
         noiseBuffer.setSize (1, samplesPerBlock);
         rPtr = noiseBuffer.getReadPointer (0);
@@ -35,8 +32,7 @@ public:
         sqrtdelta = 1.0f / std::sqrt ((float) sampleRate);
         T = 1.0f / (float) sampleRate;
 
-        y.resize ((size_t) numChannels, 0.0f);
-        y[0] = 1.0f;
+        y.resize ((size_t) numChannels, 1.0f);
     }
 
     void prepareBlock (float amtParam, int numSamples)
@@ -57,7 +53,7 @@ public:
     {
         y[ch] += sqrtdelta * rPtr[n] * amt;
         y[ch] += damping * (mean - y[ch]) * T;
-        return lpf[ch].processSample (y[ch]);
+        return lpf.processSample (y[ch], (int) ch);
     }
 
 private:
@@ -73,7 +69,7 @@ private:
     AudioBuffer<float> noiseBuffer;
     const float* rPtr = nullptr;
 
-    std::vector<dsp::IIR::Filter<float>> lpf;
+    chowdsp::SVFLowpass<float> lpf;
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (OHProcess)
 };
diff --git a/Plugin/Source/Processors/Timing_Effects/WowFlutterProcessor.h b/Plugin/Source/Processors/Timing_Effects/WowFlutterProcessor.h
@@ -41,7 +41,7 @@ private:
         HISTORY_SIZE = 1 << 21,
     };
 
-    dsp::DelayLine<float, dsp::DelayLineInterpolationTypes::Lagrange3rd> delay { HISTORY_SIZE };
+    chowdsp::DelayLine<float, chowdsp::DelayLineInterpolationTypes::Lagrange3rd> delay { HISTORY_SIZE };
     std::vector<DCBlocker> dcBlocker;
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WowFlutterProcessor)