NeuralAmpModelerPlugin

commit 3374247b61319135b059d3b3336798ec00e68018
parent 00d6080fcb5a03b1574d5ee9d47db97c5ccf56c2
Author: Steven Atkinson <steven@atkinson.mn>
Date:   Thu, 27 Jul 2023 22:22:47 -0500

Apply high-pass filter to remove DC offset present in some models (#349)

* HPF in, LPF in but commented out

* Track NeuralAmpModelerCore commit with HPF/LPF
Diffstat:
M
NeuralAmpModeler/NeuralAmpModeler.cpp
 | 
13
++++++++++++-
M
NeuralAmpModeler/NeuralAmpModeler.h
 | 
4
++++

2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/NeuralAmpModeler/NeuralAmpModeler.cpp b/NeuralAmpModeler/NeuralAmpModeler.cpp
@@ -343,12 +343,23 @@ void NeuralAmpModeler::ProcessBlock(iplug::sample** inputs, iplug::sample** outp
   if (mIR != nullptr && GetParam(kIRToggle)->Value())
     irPointers = mIR->Process(toneStackOutPointers, numChannelsInternal, numFrames);
 
+  // And the HPF for DC offset (Issue 271)
+  const double highPassCutoffFreq = 5.0;
+  // const double lowPassCutoffFreq = 20000.0;
+  const recursive_linear_filter::HighPassParams highPassParams(sampleRate, highPassCutoffFreq);
+  // const recursive_linear_filter::LowPassParams lowPassParams(sampleRate, lowPassCutoffFreq);
+  mHighPass.SetParams(highPassParams);
+  // mLowPass.SetParams(lowPassParams);
+  sample** hpfPointers = mHighPass.Process(irPointers, numChannelsInternal, numFrames);
+  // sample** lpfPointers = mLowPass.Process(hpfPointers, numChannelsInternal, numFrames);
+
   // restore previous floating point state
   std::feupdateenv(&fe_state);
 
   // Let's get outta here
   // This is where we exit mono for whatever the output requires.
-  _ProcessOutput(irPointers, outputs, numFrames, numChannelsInternal, numChannelsExternalOut);
+  _ProcessOutput(hpfPointers, outputs, numFrames, numChannelsInternal, numChannelsExternalOut);
+  // _ProcessOutput(lpfPointers, outputs, numFrames, numChannelsInternal, numChannelsExternalOut);
   // * Output of input leveling (inputs -> mInputPointers),
   // * Output of output leveling (mOutputPointers -> outputs)
   _UpdateMeters(mInputPointers, outputs, numFrames, numChannelsInternal, numChannelsExternalOut);
diff --git a/NeuralAmpModeler/NeuralAmpModeler.h b/NeuralAmpModeler/NeuralAmpModeler.h
@@ -166,6 +166,10 @@ private:
   recursive_linear_filter::Peaking mToneMid;
   recursive_linear_filter::HighShelf mToneTreble;
 
+  // Post-IR filters
+  recursive_linear_filter::HighPass mHighPass;
+  //  recursive_linear_filter::LowPass mLowPass;
+
   // Path to model's config.json or model.nam
   WDL_String mNAMPath;
   // Path to IR (.wav file)