added fixed filter for anti-aliasing/ artifacts

hsetlik · Apr 13, 2021 · 208176b · 208176b
1 parent 8c51697
commit 208176b
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Showing 2 changed files with 12 additions and 17 deletions.
diff --git a/Source/PluginProcessor.cpp b/Source/PluginProcessor.cpp
@@ -124,11 +124,7 @@ HexFmAudioProcessor::HexFmAudioProcessor()
  ),
 tree(*this, nullptr, "synthParams", createLayout(numOperators)),
 synth(6, 4, 6, &tree),
-fwdFFT(10),
-invFFT(10),
-bufferSize(getBlockSize()),
-fftArray1(new float[bufferSize]),
-fftArray2(new float[2 * bufferSize])
+fixedFilter(juce::dsp::IIR::Coefficients<float>::makeHighShelf(44100.0f, 44100.0f * 0.35f, 1.0f, 0.00001f))
 #endif
 {
  for(int i = 0; i < 4; ++i)
@@ -235,7 +231,6 @@ void HexFmAudioProcessor::changeProgramName (int index, const juce::String& newN
 //==============================================================================
 void HexFmAudioProcessor::prepareToPlay (double sampleRate, int samplesPerBlock)
 {
- bufferSize = samplesPerBlock;
  juce::ignoreUnused(samplesPerBlock);
  synth.setCurrentPlaybackSampleRate(sampleRate);
  maxiSettings::setup((int)sampleRate, 2, samplesPerBlock);
@@ -244,6 +239,13 @@ void HexFmAudioProcessor::prepareToPlay (double sampleRate, int samplesPerBlock)
  auto* voice = dynamic_cast<FmVoice*>(i);
  voice->setSampleRate(sampleRate);
  }
+ juce::dsp::ProcessSpec spec;
+ spec.sampleRate = sampleRate;
+ spec.maximumBlockSize = samplesPerBlock;
+ spec.numChannels = getTotalNumOutputChannels();
+
+ fixedFilter.prepare(spec);
+ fixedFilter.reset();
 }
 
 void HexFmAudioProcessor::releaseResources()
@@ -278,15 +280,12 @@ bool HexFmAudioProcessor::isBusesLayoutSupported (const BusesLayout& layouts) co
 
 void HexFmAudioProcessor::processBlock (juce::AudioBuffer<float>& buffer, juce::MidiBuffer& midiMessages)
 {
- if(bufferSize != buffer.getNumSamples())
- {
- bufferSize = buffer.getNumSamples();
- fftArray1 = new float[bufferSize];
- fftArray2 = new float[2 * bufferSize];
- }
  buffer.clear();
  synth.updateParams();
  synth.renderNextBlock(buffer, midiMessages, 0, buffer.getNumSamples());
+
+ juce::dsp::AudioBlock<float> block(buffer);
+ fixedFilter.process(juce::dsp::ProcessContextReplacing<float>(block));
 }
 
 //==============================================================================

diff --git a/Source/PluginProcessor.h b/Source/PluginProcessor.h
@@ -87,11 +87,7 @@ class HexFmAudioProcessor : public juce::AudioProcessor
  int voiceIndex;
  FmSynth synth;
 
- juce::dsp::FFT fwdFFT;
- juce::dsp::FFT invFFT;
- int bufferSize;
- float* fftArray1;
- float* fftArray2;
+ juce::dsp::ProcessorDuplicator<juce::dsp::IIR::Filter<float>, juce::dsp::IIR::Coefficients<float>> fixedFilter;
  //==============================================================================
  JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (HexFmAudioProcessor)
 };