From 3254981cbeb568adfca7991700e92984e0b92f12 Mon Sep 17 00:00:00 2001
From: Dominik Kaiser
Date: Thu, 25 Sep 2025 20:40:18 +0200
Subject: Implement basic CombFilter

---
 src/DSP/CombFilter.cpp | 20 ++++++++++++++++++++
 src/DSP/CombFilter.h   | 16 ++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 src/DSP/CombFilter.cpp
 create mode 100644 src/DSP/CombFilter.h

(limited to 'src/DSP')

diff --git a/src/DSP/CombFilter.cpp b/src/DSP/CombFilter.cpp
new file mode 100644
index 0000000..f7eff21
--- /dev/null
+++ b/src/DSP/CombFilter.cpp
@@ -0,0 +1,20 @@
+#include "CombFilter.h"
+
+void CombFilter::prepare(double sampleRate, int samplesPerBlock) {
+  int maxDelayTimeMs = 100;
+  int maxDelaySamples = static_cast<int>(sampleRate * maxDelayTimeMs / 1000.0);
+
+  delayBuffer.resize(maxDelaySamples, 0.0f);
+  delayInSamples = static_cast<int>(sampleRate * 0.02);
+  delayBufferWritePos = 0;
+}
+
+void CombFilter::process(float* sample) {
+  int delayBufferLength = (int)delayBuffer.size();
+  int delayReadPos = (delayBufferWritePos - delayInSamples + delayBufferLength) % delayBufferLength;
+  float delayedSample = delayBuffer[delayReadPos];
+  float out = *sample + gain * delayedSample;
+  delayBuffer[delayBufferWritePos] = *sample;
+  *sample = out;
+  delayBufferWritePos = (delayBufferWritePos + 1) % delayBufferLength;
+}
diff --git a/src/DSP/CombFilter.h b/src/DSP/CombFilter.h
new file mode 100644
index 0000000..355fbd9
--- /dev/null
+++ b/src/DSP/CombFilter.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <juce_audio_processors/juce_audio_processors.h>
+
+class CombFilter {
+public:
+  void prepare(double sampleRate, int samplesPerBlock);
+  void reset();
+  void process(float* sample);
+
+private:
+  std::vector<float> delayBuffer;
+  int delayBufferWritePos = 0;
+  int delayInSamples = 0;
+  float gain = 0.7f;
+};
-- 
cgit v1.2.3