\doxysection{cxvec\+\_\+math.\+h}
\label{cxvec__math_8h_source}\index{include/osmocom/dsp/cxvec\_math.h@{include/osmocom/dsp/cxvec\_math.h}}
\textbf{ Go to the documentation of this file.}
\begin{DoxyCode}{0}
\DoxyCodeLine{1 \textcolor{comment}{/*}}
\DoxyCodeLine{2 \textcolor{comment}{ * cxvec\_math.h}}
\DoxyCodeLine{3 \textcolor{comment}{ *}}
\DoxyCodeLine{4 \textcolor{comment}{ * Complex vectors math and signal processing}}
\DoxyCodeLine{5 \textcolor{comment}{ *}}
\DoxyCodeLine{6 \textcolor{comment}{ * Copyright (C) 2011  Sylvain Munaut <tnt@246tNt.com>}}
\DoxyCodeLine{7 \textcolor{comment}{ *}}
\DoxyCodeLine{8 \textcolor{comment}{ * All Rights Reserved}}
\DoxyCodeLine{9 \textcolor{comment}{ *}}
\DoxyCodeLine{10 \textcolor{comment}{ * This program is free software; you can redistribute it and/or modify}}
\DoxyCodeLine{11 \textcolor{comment}{ * it under the terms of the GNU General Public License as published by}}
\DoxyCodeLine{12 \textcolor{comment}{ * the Free Software Foundation; either version 2 of the License, or}}
\DoxyCodeLine{13 \textcolor{comment}{ * (at your option) any later version.}}
\DoxyCodeLine{14 \textcolor{comment}{ *}}
\DoxyCodeLine{15 \textcolor{comment}{ * This program is distributed in the hope that it will be useful,}}
\DoxyCodeLine{16 \textcolor{comment}{ * but WITHOUT ANY WARRANTY; without even the implied warranty of}}
\DoxyCodeLine{17 \textcolor{comment}{ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the}}
\DoxyCodeLine{18 \textcolor{comment}{ * GNU General Public License for more details.}}
\DoxyCodeLine{19 \textcolor{comment}{ *}}
\DoxyCodeLine{20 \textcolor{comment}{ * You should have received a copy of the GNU General Public License along}}
\DoxyCodeLine{21 \textcolor{comment}{ * with this program; if not, write to the Free Software Foundation, Inc.,}}
\DoxyCodeLine{22 \textcolor{comment}{ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-\/1301 USA.}}
\DoxyCodeLine{23 \textcolor{comment}{ */}}
\DoxyCodeLine{24 }
\DoxyCodeLine{25 \textcolor{preprocessor}{\#ifndef \_\_OSMO\_DSP\_CXVEC\_MATH\_H\_\_}}
\DoxyCodeLine{26 \textcolor{preprocessor}{\#define \_\_OSMO\_DSP\_CXVEC\_MATH\_H\_\_}}
\DoxyCodeLine{27 }
\DoxyCodeLine{37 \textcolor{preprocessor}{\#include <complex.h>}}
\DoxyCodeLine{38 \textcolor{preprocessor}{\#include <math.h>}}
\DoxyCodeLine{39 }
\DoxyCodeLine{40 \textcolor{preprocessor}{\#include <osmocom/dsp/cxvec.h>}}
\DoxyCodeLine{41 }
\DoxyCodeLine{42 }
\DoxyCodeLine{43         \textcolor{comment}{/* Generic math stuff */}}
\DoxyCodeLine{44 }
\DoxyCodeLine{45 \textcolor{preprocessor}{\#define M\_PIf (3.14159265358979323846264338327f) }}
\DoxyCodeLine{53 \textcolor{keyword}{static} \textcolor{keyword}{inline} \textcolor{keywordtype}{float}}
\DoxyCodeLine{54 osmo\_sinc(\textcolor{keywordtype}{float} x)}
\DoxyCodeLine{55 \{}
\DoxyCodeLine{56         \textcolor{keywordflow}{if} ((x >= 0.01f) || (x <= -\/0.01f)) \textcolor{keywordflow}{return} (sinf(x)/x);}
\DoxyCodeLine{57         \textcolor{keywordflow}{return} 1.0f;}
\DoxyCodeLine{58 \}}
\DoxyCodeLine{59 }
\DoxyCodeLine{64 \textcolor{keyword}{static} \textcolor{keyword}{inline} \textcolor{keywordtype}{float}}
\DoxyCodeLine{65 osmo\_normsqf(\textcolor{keywordtype}{float} complex c)}
\DoxyCodeLine{66 \{}
\DoxyCodeLine{67         \textcolor{keywordflow}{return} crealf(c) * crealf(c) + cimagf(c) * cimagf(c);}
\DoxyCodeLine{68 \}}
\DoxyCodeLine{69 }
\DoxyCodeLine{70 }
\DoxyCodeLine{71         \textcolor{comment}{/* Complex vector math */}}
\DoxyCodeLine{72 }
\DoxyCodeLine{73 \textcolor{keyword}{struct }osmo\_cxvec *}
\DoxyCodeLine{74 osmo\_cxvec\_scale(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *in, \textcolor{keywordtype}{float} complex scale,}
\DoxyCodeLine{75                  \textcolor{keyword}{struct} osmo\_cxvec *out);}
\DoxyCodeLine{76 }
\DoxyCodeLine{77 \textcolor{keyword}{struct }osmo\_cxvec *}
\DoxyCodeLine{78 osmo\_cxvec\_rotate(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *in, \textcolor{keywordtype}{float} freq\_shift,}
\DoxyCodeLine{79                   \textcolor{keyword}{struct} osmo\_cxvec *out);}
\DoxyCodeLine{80 }
\DoxyCodeLine{81 \textcolor{keyword}{struct }osmo\_cxvec *}
\DoxyCodeLine{82 osmo\_cxvec\_delay(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *v, \textcolor{keywordtype}{float} delay,}
\DoxyCodeLine{83                  \textcolor{keyword}{struct} osmo\_cxvec *out);}
\DoxyCodeLine{84 }
\DoxyCodeLine{86 \textcolor{keyword}{enum} osmo\_cxvec\_conv\_type \{}
\DoxyCodeLine{88         CONV\_FULL\_SPAN,   }
\DoxyCodeLine{90         CONV\_OVERLAP\_ONLY,}
\DoxyCodeLine{92         CONV\_NO\_DELAY,}
\DoxyCodeLine{93 \};}
\DoxyCodeLine{94 }
\DoxyCodeLine{95 \textcolor{keyword}{struct }osmo\_cxvec *}
\DoxyCodeLine{96 osmo\_cxvec\_convolve(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *f, \textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *g,}
\DoxyCodeLine{97                     \textcolor{keyword}{enum} osmo\_cxvec\_conv\_type type, \textcolor{keyword}{struct} osmo\_cxvec *out);}
\DoxyCodeLine{98 }
\DoxyCodeLine{99 \textcolor{keyword}{struct }osmo\_cxvec *}
\DoxyCodeLine{100 osmo\_cxvec\_correlate(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *f, \textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *g,}
\DoxyCodeLine{101                      \textcolor{keywordtype}{int} g\_corr\_step, \textcolor{keyword}{struct} osmo\_cxvec *out);}
\DoxyCodeLine{102 }
\DoxyCodeLine{103 \textcolor{keywordtype}{float} complex}
\DoxyCodeLine{104 osmo\_cxvec\_interpolate\_point(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *cv, \textcolor{keywordtype}{float} pos);}
\DoxyCodeLine{105 }
\DoxyCodeLine{106 \textcolor{keywordtype}{int}}
\DoxyCodeLine{107 osmo\_cxvec\_peaks\_scan(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *cv, \textcolor{keywordtype}{int} *peaks\_idx, \textcolor{keywordtype}{int} N);}
\DoxyCodeLine{108 }
\DoxyCodeLine{110 \textcolor{keyword}{enum} osmo\_cxvec\_peak\_alg \{}
\DoxyCodeLine{112         PEAK\_WEIGH\_WIN,   }
\DoxyCodeLine{114         PEAK\_WEIGH\_WIN\_CENTER,}
\DoxyCodeLine{116         PEAK\_EARLY\_LATE,}
\DoxyCodeLine{117 \};}
\DoxyCodeLine{118 }
\DoxyCodeLine{119 \textcolor{keywordtype}{float}}
\DoxyCodeLine{120 osmo\_cxvec\_peak\_energy\_find(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *cv, \textcolor{keywordtype}{int} win\_size,}
\DoxyCodeLine{121                             \textcolor{keyword}{enum} osmo\_cxvec\_peak\_alg alg,}
\DoxyCodeLine{122                             \textcolor{keywordtype}{float} complex *peak\_val\_p);}
\DoxyCodeLine{123 }
\DoxyCodeLine{124 \textcolor{keyword}{struct }osmo\_cxvec *}
\DoxyCodeLine{125 osmo\_cxvec\_sig\_normalize(\textcolor{keyword}{const} \textcolor{keyword}{struct} osmo\_cxvec *sig,}
\DoxyCodeLine{126                          \textcolor{keywordtype}{int} decim, \textcolor{keywordtype}{float} freq\_shift,}
\DoxyCodeLine{127                          \textcolor{keyword}{struct} osmo\_cxvec *out);}
\DoxyCodeLine{128 }
\DoxyCodeLine{131 \textcolor{preprocessor}{\#endif }\textcolor{comment}{/* \_\_OSMO\_DSP\_CXVEC\_MATH\_H\_\_ */}\textcolor{preprocessor}{}}

\end{DoxyCode}