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/* 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);
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