even more stuff

core/src/dsp/taps/raised_cosine.h

@@ -0,0 +1,33 @@
+#pragma once
+#include <math.h>
+#include "tap.h"
+#include "../math/constants.h"
+#include "../math/sinc.h"
+
+namespace dsp::taps {
+    template<class T>
+    inline tap<T> raisedCosine(int count, double beta, double Ts) {
+        // Allocate taps
+        tap<T> taps = taps::alloc<T>(count);
+        
+        // Generate taps
+        double half = (double)count / 2.0;
+        double limit = Ts / (2.0 * beta);
+        for (int i = 0; i < count; i++) {
+            double t = (double)i - half + 0.5;
+            if (t == limit || t == -limit) {
+                taps.taps[i] = math::sinc(1.0 / (2.0*beta)) * DB_M_PI / (4.0*Ts);
+            }
+            else {
+                taps.taps[i] = math::sinc(t / Ts) * DB_M_PI / (4.0*Ts);
+            }
+        }
+
+        return taps;
+    }
+
+    template<class T>
+    inline tap<T> raisedCosine(int count, double beta, double symbolrate, double samplerate) {
+        return raisedCosine<T>(count, beta, samplerate / symbolrate);
+    }
+}