/usr/include/itpp/signal/window.h is in libitpp-dev 4.3.1-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | /*!
* \file
* \brief Definitions of window functions
* \author Tony Ottosson, Tobias Ringstrom, Pal Frenger, Adam Piatyszek
* and Kumar Appaiah
*
* -------------------------------------------------------------------------
*
* Copyright (C) 1995-2010 (see AUTHORS file for a list of contributors)
*
* This file is part of IT++ - a C++ library of mathematical, signal
* processing, speech processing, and communications classes and functions.
*
* IT++ 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.
*
* IT++ 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 IT++. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef WINDOW_H
#define WINDOW_H
#include <itpp/base/vec.h>
#include <itpp/itexports.h>
namespace itpp
{
/*!
\addtogroup windfunc
*/
/*!\addtogroup windfunc
\brief Windowing functions
*/
//!@{
/*! \brief Hamming window
The \c n size Hamming window is a vector \f$w\f$ where the \f$i\f$th component is
\f[
w_i = 0.54 - 0.46 \cos(2\pi i/(n-1))
\f]
*/
ITPP_EXPORT vec hamming(int size);
/*! \brief Hanning window
The \c n size Hanning window is a vector \f$w\f$ where the \f$i\f$th component is
\f[
w_i = 0.5(1 - \cos(2\pi (i+1)/(n+1))
\f]
Observe that this function is not the same as the hann() function which is defined
as in matlab.
*/
ITPP_EXPORT vec hanning(int n);
/*! \brief Hanning window compatible with matlab
The \c n size Hanning window is a vector \f$w\f$ where the \f$i\f$th component is
\f[
w_i = 0.5(1 - \cos(2\pi i/(n-1))
\f]
*/
ITPP_EXPORT vec hann(int n);
/*! \brief Blackman window
The \c n size Blackman window is a vector \f$w\f$ where the \f$i\f$th component is
\f[
w_i = 0.42 - 0.5\cos(2\pi i/(n-1)) + 0.08\cos(4\pi i/(n-1))
\f]
*/
ITPP_EXPORT vec blackman(int n);
/*! \brief Triangular window
The \c n size triangle window is a vector \f$w\f$ where the \f$i\f$th component is
\f[
w_i = w_{n-i-1} = \frac{2(i+1)}{n+1}
\f]
for \c n odd and for \c n even
\f[
w_i = w_{n-i-1} = \frac{2i+1}{n}
\f]
*/
ITPP_EXPORT vec triang(int n);
/*! \brief Square root window
The square-root of the Triangle window.
sqrt_win(n) = sqrt(triang(n))
*/
ITPP_EXPORT vec sqrt_win(int n);
/*!
\brief Dolph-Chebyshev window
The length \c n Dolph-Chebyshev window is a vector \f$w\f$ whose \f$i\f$th
transform component is given by
\f[
W[k] = \frac{T_M\left(\beta \cos\left(\frac{\pi k}{M}\right)
\right)}{T_M(\beta)},k = 0, 1, 2, \ldots, M - 1
\f]
where \c T_n(x) is the order \c n Chebyshev polynomial of the first kind.
\param n length of the Doplh-Chebyshev window
\param at attenutation of side lobe (in dB)
\return symmetric length \c n Doplh-Chebyshev window
\author Kumar Appaiah and Adam Piatyszek (code review)
*/
ITPP_EXPORT vec chebwin(int n, double at);
//!@}
} //namespace itpp
#endif // #ifndef WINDOW_H
|