AnalogTapeModel

Physical modelling signal processing for analog tape recording
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FlutterProcess.cpp (1400B)

      1 #include "FlutterProcess.h"
      2 
      3 void FlutterProcess::prepare (double sampleRate, int samplesPerBlock, int numChannels)
      4 {
      5     fs = (float) sampleRate;
      6 
      7     depthSlew.resize ((size_t) numChannels);
      8     for (auto& dSlew : depthSlew)
      9     {
     10         dSlew.reset (sampleRate, 0.05);
     11         dSlew.setCurrentAndTargetValue (depthSlewMin);
     12     }
     13 
     14     phase1.resize ((size_t) numChannels, 0.0f);
     15     phase2.resize ((size_t) numChannels, 0.0f);
     16     phase3.resize ((size_t) numChannels, 0.0f);
     17 
     18     amp1 = -230.0f * 1000.0f / fs;
     19     amp2 = -80.0f * 1000.0f / fs;
     20     amp3 = -99.0f * 1000.0f / fs;
     21     dcOffset = 350.0f * 1000.0f / fs;
     22 
     23     flutterBuffer.setSize (numChannels, samplesPerBlock);
     24 }
     25 
     26 void FlutterProcess::prepareBlock (float curDepth, float flutterFreq, int numSamples, int numChannels)
     27 {
     28     for (auto& dSlew : depthSlew)
     29         dSlew.setTargetValue (jmax (depthSlewMin, curDepth));
     30 
     31     angleDelta1 = MathConstants<float>::twoPi * flutterFreq / fs;
     32     angleDelta2 = 2.0f * angleDelta1;
     33     angleDelta3 = 3.0f * angleDelta1;
     34 
     35     flutterBuffer.setSize (numChannels, numSamples, false, false, true);
     36     flutterBuffer.clear();
     37     flutterPtrs = flutterBuffer.getArrayOfWritePointers();
     38 }
     39 
     40 void FlutterProcess::plotBuffer (foleys::MagicPlotSource* plot)
     41 {
     42     if (shouldTurnOff())
     43         flutterBuffer.clear();
     44 
     45     flutterBuffer.applyGain (1.3333f / amp1);
     46     plot->pushSamples (flutterBuffer);
     47 }