even more stuff

core/src/dsp/taps/band_pass.h

@@ -0,0 +1,23 @@
+#pragma once
+#include "../types.h"
+#include "windowed_sinc.h"
+#include "estimate_tap_count.h"
+#include "../window/nuttall.h"
+#include "../math/phasor.h"
+#include "../math/freq_to_omega.h"
+
+namespace dsp::taps {
+    template<class T>
+    inline tap<T> bandPass(double bandStart, double bandStop, double transWidth, double sampleRate) {
+        assert(bandStop > bandStart);
+        float offsetOmega = math::freqToOmega((bandStart + bandStop) / 2.0, sampleRate);
+        return windowedSinc<T>(estimateTapCount(transWidth, sampleRate), (bandStop - bandStart) / 2.0, sampleRate, [=](double n, double N) {
+            if constexpr (std::is_same_v<T, float>) {
+                return cosf(offsetOmega * (float)n) * window::nuttall(n, N);
+            }
+            if constexpr (std::is_same_v<T, complex_t>) {
+                return math::phasor(offsetOmega * (float)n) * window::nuttall(n, N);
+            }
+        });
+    }
+}