even more stuff

core/src/dsp/window/blackman_nuttall.h

@@ -0,0 +1,10 @@
+#pragma once
+#include <math.h>
+#include "cosine.h"
+
+namespace dsp::window {
+    inline double blackmanNuttall(double n, double N) {
+        const double coefs[] = { 0.3635819, 0.4891775, 0.1365995, 0.0106411 };
+        return cosine(n, N, coefs, sizeof(coefs) / sizeof(double));
+    }
+}