not sure

dsp/filters.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <string.h>
+#include <stdlib.h>
+#include <math.h>
+#include "constants.h"
+#include "../lib/optimization.h"
+#include "oscillator.h"
+
+typedef struct
+{
+	float alpha;
+	float prev_sample;
+	float gain;
+} ResistorCapacitor;
+
+void init_preemphasis(ResistorCapacitor *filter, float tau, float sample_rate);
+float apply_preemphasis(ResistorCapacitor *filter, float sample);
+
+float hard_clip(float sample, float threshold);