comparison src/window_makers.hpp @ 0:add35537fdbb tip

Initial import

+//  Copyright 2011, Ian Hobson.
+//
+//  This file is part of gpsynth.
+//
+//  gpsynth is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  gpsynth is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with gpsynth in the file COPYING. 
+//  If not, see http://www.gnu.org/licenses/.
+
+#pragma once
+
+#include <cmath>
+#include <iterator>
+
+namespace dsp {
+  
+template<typename OutputIterator>
+void BlackmanWindow(int size, OutputIterator output) {
+  typedef typename std::iterator_traits<OutputIterator>::value_type T;
+  T m1 = (M_PI * 2.0) / (size - 1.0);
+  T m2 = (M_PI * 4.0) / (size - 1.0);
+  for (T i = 0; i < size; i++) {
+    *output++ = 0.42 - 0.5 * std::cos(i * m1) + 0.08 * std::cos(i * m2);
+  }
+}
+
+template<typename OutputIterator>
+void HannWindow(int size, OutputIterator output) {
+  typedef typename std::iterator_traits<OutputIterator>::value_type T;
+  T m = (M_PI * 2.0) / (size - 1.0);
+  for (T i = 0; i < size; i++) {
+    *output++ = 0.5 - 0.5 * std::cos(i * m);
+  }
+}
+
+template<typename OutputIterator>
+void HammingWindow(int size, OutputIterator output) {
+  typedef typename std::iterator_traits<OutputIterator>::value_type T;
+  T m = (M_PI * 2.0) / (size - 1.0);
+  for (T i = 0; i < size; i++) {
+    *output++ = 0.54 - 0.46 * std::cos(i * m);
+  }
+}
+
+};