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150 lines
2.9 KiB
C++
150 lines
2.9 KiB
C++
/*---------------------------------------------------------------------------*\
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FILE........: comp_prim.h
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AUTHOR......: David Rowe
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DATE CREATED: Marh 2015
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Complex number maths primitives.
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\*---------------------------------------------------------------------------*/
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/*
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Copyright (C) 2015 David Rowe
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All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License version 2.1, as
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published by the Free Software Foundation. This program is
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distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __COMP_PRIM__
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#define __COMP_PRIM__
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#include <math.h>
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#include "codec2/comp.h"
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namespace FreeDV
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{
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/*---------------------------------------------------------------------------*\
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FUNCTIONS
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\*---------------------------------------------------------------------------*/
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inline static COMP cneg(COMP a)
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{
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COMP res;
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res.real = -a.real;
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res.imag = -a.imag;
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return res;
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}
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inline static COMP cconj(COMP a)
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{
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COMP res;
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res.real = a.real;
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res.imag = -a.imag;
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return res;
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}
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inline static COMP cmult(COMP a, COMP b)
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{
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COMP res;
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res.real = a.real*b.real - a.imag*b.imag;
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res.imag = a.real*b.imag + a.imag*b.real;
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return res;
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}
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inline static COMP fcmult(float a, COMP b)
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{
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COMP res;
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res.real = a*b.real;
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res.imag = a*b.imag;
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return res;
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}
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inline static COMP cadd(COMP a, COMP b)
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{
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COMP res;
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res.real = a.real + b.real;
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res.imag = a.imag + b.imag;
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return res;
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}
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inline static float cabsolute(COMP a)
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{
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return sqrt(pow(a.real, 2.0) + pow(a.imag, 2.0));
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}
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/*
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* Euler's formula in a new convenient function
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*/
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inline static COMP comp_exp_j(float phi){
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COMP res;
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res.real = cosf(phi);
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res.imag = sinf(phi);
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return res;
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}
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/*
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* Quick and easy complex 0
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*/
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inline static COMP comp0(){
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COMP res;
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res.real = 0;
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res.imag = 0;
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return res;
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}
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/*
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* Quick and easy complex subtract
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*/
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inline static COMP csub(COMP a, COMP b){
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COMP res;
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res.real = a.real-b.real;
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res.imag = a.imag-b.imag;
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return res;
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}
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/*
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* Compare the magnitude of a and b. if |a|>|b|, return true, otw false.
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* This needs no square roots
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*/
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inline static int comp_mag_gt(COMP a,COMP b){
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return ((a.real*a.real)+(a.imag*a.imag)) > ((b.real*b.real)+(b.imag*b.imag));
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}
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/*
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* Normalize a complex number's magnitude to 1
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*/
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inline static COMP comp_normalize(COMP a){
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COMP b;
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float av = cabsolute(a);
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b.real = a.real/av;
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b.imag = a.imag/av;
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return b;
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}
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} // FreeDV
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#endif
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