comparison src/xtract_window_private.h @ 107:3e648eec95cb

- Added new helper functions: xtract_windowed() and xtract_features_from_subframes()
- Added windowing functions (window.c)

+/* libxtract feature extraction library
+ *  
+ * Copyright (C) 2006 Jamie Bullock
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
+ * USA.
+ */
+
+/* xtract_window_private.h: declares window generation functions */
+
+#define PI 3.1415926535897931
+
+/** \brief generate a Gaussian window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ * \param sd the standard deviation of the "distribution" represented by the Gaussian curve. The higher the value of sd, the wider the curve. Generally sd <= 0.5
+ *
+ */
+void gauss(float *window, const int N, const float sd);
+
+/** \brief generate a Hamming window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ *
+ */
+void hamming(float *window, const int N);
+
+/** \brief generate a Hann window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ *
+ */
+void hann(float *window, const int N);
+
+/** \brief generate a Bartlett window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ *
+ */
+void bartlett(float *window, const int N);
+
+/** \brief generate a Triangular window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ *
+ */
+void triangular(float *window, const int N);
+
+/** \brief generate a Bartlett-Hann  window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ *
+ */
+void bartlett_hann(float *window, const int N);
+
+/** \brief generate a Blackman window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ *
+ */
+void blackman(float *window, const int N);
+
+/** \brief generate a Kaiser window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ * \param alpha The larger the value of |alpha|, the narrower the window becomes
+ *
+ */
+void kaiser(float *window, const int N, const float alpha);
+
+/** \brief generate a Blackman-Harris window
+ *
+ * \param *window a pointer to an array to contain the window data
+ * \param N the number of elements in the array pointed to by *window
+ *
+ */
+void blackman_harris(float *window, const int N);
+