dec2filter2.h

各种工程计算的库函数

/*

    Decimation filter for rate 2
    Copyright (C) 2000 Jussi Laako

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Low pass FIR filter derived using FFT method with Kaiser window (181 terms).
    Generated by SYSTOLIX Filter Synthesis at 0:07:27 on 5.9.2000.
    Specification:
    F1 = 0.225
    F2 = 0.25
    Passband Ripple = 0.5dB
    Stopband Ripple = 72dB

*/


#ifdef _MSC_VER
#pragma warning(disable:4305)
#endif


static const long lDec2FilterLen = 181l;

static const float fDec2FilterGain =  1.0f;
static const float fpDec2FilterCoeffs[] = {
1.51677963743051E-05,
2.12356138591066E-05,
-2.07673029716099E-05,
-3.72972285343722E-05,
2.41723330749224E-05,
5.90544587901592E-05,
-2.34422669344186E-05,
-8.66962687022156E-05,
1.62558157797743E-05,
1.19855945661191E-04,
-1.53728086465713E-17,
-1.57461347415189E-04,
-2.80926722716196E-05,
1.97602731760735E-04,
7.07587093422398E-05,
-2.37431954464962E-04,
-1.30473200021508E-04,
2.73107023448129E-04,
2.09181585735806E-04,
-2.99795244297851E-04,
-3.08004601576298E-04,
3.11746420336731E-04,
4.26930937051003E-04,
-3.02444783171423E-04,
-5.64515257337918E-04,
2.6484460373196E-04,
7.17601545081064E-04,
-1.91689921209387E-04,
-8.81093026248385E-04,
7.59137517317467E-05,
1.04779003177996E-03,
8.88932129413872E-05,
-1.20831588353899E-03,
-3.07959697044361E-04,
1.35114822036693E-03,
5.84776863167925E-04,
-1.46276912823192E-03,
-9.20531453093782E-04,
1.52794213137524E-03,
1.31355609568224E-03,
-1.53011775514052E-03,
-1.7588251596943E-03,
1.45196228672833E-03,
2.24752402730415E-03,
-1.27599690935289E-03,
-2.7667170856807E-03,
9.85326991602064E-04,
3.29913488868913E-03,
-5.64434428031815E-04,
-3.82309367458978E-03,
2.26581551505111E-16,
4.31255057913865E-03,
7.18281820598086E-04,
-4.73728520994109E-03,
-1.59693600328101E-03,
5.06318226627837E-03,
2.63802918077221E-03,
-5.25256962315169E-03,
-3.83862069020881E-03,
5.26453980886495E-03,
5.19037848653672E-03,
-5.05514631447823E-03,
-6.67939013154679E-03,
4.57731237712647E-03,
8.28619125279827E-03,
-3.78020453541465E-03,
-9.98602443595491E-03,
2.60767795298092E-03,
1.17493309104662E-02,
-9.95136526757158E-04,
-1.35424661479723E-02,
-1.13635906807626E-03,
1.53286192091759E-02,
3.89095022056693E-03,
-1.70689049661968E-02,
-7.41832808514349E-03,
1.87235887993286E-02,
1.19535997388449E-02,
-2.02533955764555E-02,
-1.79012340819737E-02,
2.16208491435656E-02,
2.60312627365459E-02,
-0.022791585545602,
-3.80117042896856E-02,
2.37355829807469E-02,
5.82178729061808E-02,
-2.44282541373491E-02,
-0.102776157031988,
2.48513519804371E-02,
0.317121641931833,
0.474879311935805,
0.317121641931833,
2.48513519804371E-02,
-0.102776157031988,
-2.44282541373491E-02,
5.82178729061808E-02,
2.37355829807469E-02,
-3.80117042896856E-02,
-0.022791585545602,
2.60312627365459E-02,
2.16208491435656E-02,
-1.79012340819737E-02,
-2.02533955764555E-02,
1.19535997388449E-02,
1.87235887993286E-02,
-7.41832808514349E-03,
-1.70689049661968E-02,
3.89095022056693E-03,
1.53286192091759E-02,
-1.13635906807626E-03,
-1.35424661479723E-02,
-9.95136526757158E-04,
1.17493309104662E-02,
2.60767795298092E-03,
-9.98602443595491E-03,
-3.78020453541465E-03,
8.28619125279827E-03,
4.57731237712647E-03,
-6.67939013154679E-03,
-5.05514631447823E-03,
5.19037848653672E-03,
5.26453980886495E-03,
-3.83862069020881E-03,
-5.25256962315169E-03,
2.63802918077221E-03,
5.06318226627837E-03,
-1.59693600328101E-03,
-4.73728520994109E-03,
7.18281820598086E-04,
4.31255057913865E-03,
2.26581551505111E-16,
-3.82309367458978E-03,
-5.64434428031815E-04,
3.29913488868913E-03,
9.85326991602064E-04,
-2.7667170856807E-03,
-1.27599690935289E-03,
2.24752402730415E-03,
1.45196228672833E-03,
-1.7588251596943E-03,
-1.53011775514052E-03,
1.31355609568224E-03,
1.52794213137524E-03,
-9.20531453093782E-04,
-1.46276912823192E-03,
5.84776863167925E-04,
1.35114822036693E-03,
-3.07959697044361E-04,
-1.20831588353899E-03,
8.88932129413872E-05,
1.04779003177996E-03,
7.59137517317467E-05,
-8.81093026248385E-04,
-1.91689921209387E-04,
7.17601545081064E-04,
2.6484460373196E-04,
-5.64515257337918E-04,
-3.02444783171423E-04,
4.26930937051003E-04,
3.11746420336731E-04,
-3.08004601576298E-04,
-2.99795244297851E-04,
2.09181585735806E-04,
2.73107023448129E-04,
-1.30473200021508E-04,
-2.37431954464962E-04,
7.07587093422398E-05,
1.97602731760735E-04,
-2.80926722716196E-05,
-1.57461347415189E-04,
-1.53728086465713E-17,
1.19855945661191E-04,
1.62558157797743E-05,
-8.66962687022156E-05,
-2.34422669344186E-05,
5.90544587901592E-05,
2.41723330749224E-05,
-3.72972285343722E-05,
-2.07673029716099E-05,
2.12356138591066E-05,
1.51677963743051E-05
};

static const double dDec2FilterGain =  1.0;
static const double dpDec2FilterCoeffs[] = {
1.51677963743051E-05,
2.12356138591066E-05,
-2.07673029716099E-05,
-3.72972285343722E-05,
2.41723330749224E-05,
5.90544587901592E-05,
-2.34422669344186E-05,
-8.66962687022156E-05,
1.62558157797743E-05,
1.19855945661191E-04,
-1.53728086465713E-17,
-1.57461347415189E-04,
-2.80926722716196E-05,
1.97602731760735E-04,
7.07587093422398E-05,
-2.37431954464962E-04,
-1.30473200021508E-04,
2.73107023448129E-04,
2.09181585735806E-04,
-2.99795244297851E-04,
-3.08004601576298E-04,
3.11746420336731E-04,
4.26930937051003E-04,
-3.02444783171423E-04,
-5.64515257337918E-04,
2.6484460373196E-04,
7.17601545081064E-04,
-1.91689921209387E-04,
-8.81093026248385E-04,
7.59137517317467E-05,
1.04779003177996E-03,
8.88932129413872E-05,
-1.20831588353899E-03,
-3.07959697044361E-04,
1.35114822036693E-03,
5.84776863167925E-04,
-1.46276912823192E-03,
-9.20531453093782E-04,
1.52794213137524E-03,
1.31355609568224E-03,
-1.53011775514052E-03,
-1.7588251596943E-03,
1.45196228672833E-03,
2.24752402730415E-03,
-1.27599690935289E-03,
-2.7667170856807E-03,
9.85326991602064E-04,
3.29913488868913E-03,
-5.64434428031815E-04,
-3.82309367458978E-03,
2.26581551505111E-16,
4.31255057913865E-03,
7.18281820598086E-04,
-4.73728520994109E-03,
-1.59693600328101E-03,
5.06318226627837E-03,
2.63802918077221E-03,
-5.25256962315169E-03,
-3.83862069020881E-03,
5.26453980886495E-03,
5.19037848653672E-03,
-5.05514631447823E-03,
-6.67939013154679E-03,
4.57731237712647E-03,
8.28619125279827E-03,
-3.78020453541465E-03,
-9.98602443595491E-03,
2.60767795298092E-03,
1.17493309104662E-02,
-9.95136526757158E-04,
-1.35424661479723E-02,
-1.13635906807626E-03,
1.53286192091759E-02,
3.89095022056693E-03,
-1.70689049661968E-02,
-7.41832808514349E-03,
1.87235887993286E-02,
1.19535997388449E-02,
-2.02533955764555E-02,
-1.79012340819737E-02,
2.16208491435656E-02,
2.60312627365459E-02,
-0.022791585545602,
-3.80117042896856E-02,
2.37355829807469E-02,
5.82178729061808E-02,
-2.44282541373491E-02,
-0.102776157031988,
2.48513519804371E-02,
0.317121641931833,
0.474879311935805,
0.317121641931833,
2.48513519804371E-02,
-0.102776157031988,
-2.44282541373491E-02,
5.82178729061808E-02,
2.37355829807469E-02,
-3.80117042896856E-02,
-0.022791585545602,
2.60312627365459E-02,
2.16208491435656E-02,
-1.79012340819737E-02,
-2.02533955764555E-02,
1.19535997388449E-02,
1.87235887993286E-02,
-7.41832808514349E-03,
-1.70689049661968E-02,
3.89095022056693E-03,
1.53286192091759E-02,
-1.13635906807626E-03,
-1.35424661479723E-02,
-9.95136526757158E-04,
1.17493309104662E-02,
2.60767795298092E-03,
-9.98602443595491E-03,
-3.78020453541465E-03,
8.28619125279827E-03,
4.57731237712647E-03,
-6.67939013154679E-03,
-5.05514631447823E-03,
5.19037848653672E-03,
5.26453980886495E-03,
-3.83862069020881E-03,
-5.25256962315169E-03,
2.63802918077221E-03,
5.06318226627837E-03,
-1.59693600328101E-03,
-4.73728520994109E-03,
7.18281820598086E-04,
4.31255057913865E-03,
2.26581551505111E-16,
-3.82309367458978E-03,
-5.64434428031815E-04,
3.29913488868913E-03,
9.85326991602064E-04,
-2.7667170856807E-03,
-1.27599690935289E-03,
2.24752402730415E-03,
1.45196228672833E-03,
-1.7588251596943E-03,
-1.53011775514052E-03,
1.31355609568224E-03,
1.52794213137524E-03,
-9.20531453093782E-04,
-1.46276912823192E-03,
5.84776863167925E-04,
1.35114822036693E-03,
-3.07959697044361E-04,
-1.20831588353899E-03,
8.88932129413872E-05,
1.04779003177996E-03,
7.59137517317467E-05,
-8.81093026248385E-04,
-1.91689921209387E-04,
7.17601545081064E-04,
2.6484460373196E-04,
-5.64515257337918E-04,
-3.02444783171423E-04,
4.26930937051003E-04,
3.11746420336731E-04,
-3.08004601576298E-04,
-2.99795244297851E-04,
2.09181585735806E-04,
2.73107023448129E-04,
-1.30473200021508E-04,
-2.37431954464962E-04,
7.07587093422398E-05,
1.97602731760735E-04,
-2.80926722716196E-05,
-1.57461347415189E-04,
-1.53728086465713E-17,
1.19855945661191E-04,
1.62558157797743E-05,
-8.66962687022156E-05,
-2.34422669344186E-05,
5.90544587901592E-05,
2.41723330749224E-05,
-3.72972285343722E-05,
-2.07673029716099E-05,
2.12356138591066E-05,
1.51677963743051E-05
};