dec3iir.h

各种工程计算的库函数

/*

    IIR Decimation filter for rate 3
    Copyright (C) 2002 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

*/


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


/* f1: 0.15,  f2: 0.16667, r: 0.5, a: 72, t: chebyshev */

/*static const long lDec3IIRSize = 10l;

static const float fpDec3IIRCoeffs[][5] = {
{  // 0
    0.205234253514393,
    0.410468507028786,
    0.205234253514393,
    1.16785413526889,
    -0.988791149326458
},
{  // 1
    0.195102566174706,
    0.390205132349413,
    0.195102566174706,
    1.18627805084895,
    -0.966688315547777
},
{  // 2
    0.177737827687996,
    0.355475655375992,
    0.177737827687996,
    1.23399160039572,
    -0.944942911147706
},
{  // 3
    0.154099624689978,
    0.308199249379955,
    0.154099624689978,
    1.30720250542069,
    -0.923601004180597
},
{  // 4
    0.12565595909824,
    0.251311918196479,
    0.12565595909824,
    1.40028694844756,
    -0.90291078484052
},
{  // 5
    0.0945035087026048,
    0.18900701740521,
    0.0945035087026048,
    1.50536508729511,
    -0.883379122105524
},
{  // 6
    0.0634071813715804,
    0.126814362743161,
    0.0634071813715804,
    1.61216230556321,
    -0.865791031049534
},
{  // 7
    0.0356575599864075,
    0.071315119972815,
    0.0356575599864075,
    1.70852981180808,
    -0.851160051753707
},
{  // 8
    0.0146679323911365,
    0.0293358647822729,
    0.0146679323911365,
    1.7819124197207,
    -0.840584149285245
},
{  // 9
    0.00333345430283358,
    0.00666690860566716,
    0.00333345430283358,
    1.8216827274188,
    -0.835016544630132
}
};


static const double dpDec3IIRCoeffs[][5] = {
{  // 0
    0.205234253514393,
    0.410468507028786,
    0.205234253514393,
    1.16785413526889,
    -0.988791149326458
},
{  // 1
    0.195102566174706,
    0.390205132349413,
    0.195102566174706,
    1.18627805084895,
    -0.966688315547777
},
{  // 2
    0.177737827687996,
    0.355475655375992,
    0.177737827687996,
    1.23399160039572,
    -0.944942911147706
},
{  // 3
    0.154099624689978,
    0.308199249379955,
    0.154099624689978,
    1.30720250542069,
    -0.923601004180597
},
{  // 4
    0.12565595909824,
    0.251311918196479,
    0.12565595909824,
    1.40028694844756,
    -0.90291078484052
},
{  // 5
    0.0945035087026048,
    0.18900701740521,
    0.0945035087026048,
    1.50536508729511,
    -0.883379122105524
},
{  // 6
    0.0634071813715804,
    0.126814362743161,
    0.0634071813715804,
    1.61216230556321,
    -0.865791031049534
},
{  // 7
    0.0356575599864075,
    0.071315119972815,
    0.0356575599864075,
    1.70852981180808,
    -0.851160051753707
},
{  // 8
    0.0146679323911365,
    0.0293358647822729,
    0.0146679323911365,
    1.7819124197207,
    -0.840584149285245
},
{  // 9
    0.00333345430283358,
    0.00666690860566716,
    0.00333345430283358,
    1.8216827274188,
    -0.835016544630132
}
};*/


/* f1: 0.15833,  f2: 0.16667, r: 0.5, a: 72, t: chebyshev */

static const long lDec3IIRSize = 15l;

static const float fpDec3IIRCoeffs[][5] = {
{ // 0
    0.227183883925248,
    0.454367767850496,
    0.227183883925248,
    1.08572205416117,
    -0.994457589862163
},
{ // 1
    0.221855994774946,
    0.443711989549892,
    0.221855994774946,
    1.09601764367747,
    -0.98344162277725
},
{ // 2
    0.212592980776955,
    0.42518596155391,
    0.212592980776955,
    1.12211197854359,
    -0.972483901651414
},
{ // 3
    0.199595930973311,
    0.399191861946622,
    0.199595930973311,
    1.16317567449588,
    -0.961559398389121
},
{ // 4
    0.18316075471287,
    0.36632150942574,
    0.18316075471287,
    1.21802616326257,
    -0.950669182114051
},
{ // 5
    0.163705706179478,
    0.327411412358956,
    0.163705706179478,
    1.28502740000074,
    -0.939850224718655
},
{ // 6
    0.141802351572512,
    0.283604703145023,
    0.141802351572512,
    1.3619755269643,
    -0.92918493325435
},
{ // 7
    0.118203876466788,
    0.236407752933576,
    0.118203876466788,
    1.44599372092249,
    -0.918809226789646
},
{ // 8
    0.093861773484246,
    0.187723546968492,
    0.093861773484246,
    1.53347004284834,
    -0.908917136785328
},
{ // 9
    0.0699194945061142,
    0.139838989012228,
    0.0699194945061142,
    1.62008122059117,
    -0.899759198615628
},
{ // 10
    0.0476712502362917,
    0.0953425004725834,
    0.0476712502362917,
    1.7009467375224,
    -0.89163173846757
},
{ // 11
    0.0284778725711403,
    0.0569557451422807,
    0.0284778725711403,
    1.77094358324009,
    -0.884855073524649
},
{ // 12
    0.0136409510384993,
    0.0272819020769987,
    0.0136409510384993,
    1.8251771922945,
    -0.879740996448497
},
{ // 13
    0.00425040107325392,
    0.00850080214650783,
    0.00425040107325392,
    1.85955186596461,
    -0.876553470257628
},
{ // 14
    0.0321672139532161,
    0.0321672139532161,
    0,
    0.935665572093568,
    0
}
};


static const double dpDec3IIRCoeffs[][5] = {
{ // 0
    0.227183883925248,
    0.454367767850496,
    0.227183883925248,
    1.08572205416117,
    -0.994457589862163
},
{ // 1
    0.221855994774946,
    0.443711989549892,
    0.221855994774946,
    1.09601764367747,
    -0.98344162277725
},
{ // 2
    0.212592980776955,
    0.42518596155391,
    0.212592980776955,
    1.12211197854359,
    -0.972483901651414
},
{ // 3
    0.199595930973311,
    0.399191861946622,
    0.199595930973311,
    1.16317567449588,
    -0.961559398389121
},
{ // 4
    0.18316075471287,
    0.36632150942574,
    0.18316075471287,
    1.21802616326257,
    -0.950669182114051
},
{ // 5
    0.163705706179478,
    0.327411412358956,
    0.163705706179478,
    1.28502740000074,
    -0.939850224718655
},
{ // 6
    0.141802351572512,
    0.283604703145023,
    0.141802351572512,
    1.3619755269643,
    -0.92918493325435
},
{ // 7
    0.118203876466788,
    0.236407752933576,
    0.118203876466788,
    1.44599372092249,
    -0.918809226789646
},
{ // 8
    0.093861773484246,
    0.187723546968492,
    0.093861773484246,
    1.53347004284834,
    -0.908917136785328
},
{ // 9
    0.0699194945061142,
    0.139838989012228,
    0.0699194945061142,
    1.62008122059117,
    -0.899759198615628
},
{ // 10
    0.0476712502362917,
    0.0953425004725834,
    0.0476712502362917,
    1.7009467375224,
    -0.89163173846757
},
{ // 11
    0.0284778725711403,
    0.0569557451422807,
    0.0284778725711403,
    1.77094358324009,
    -0.884855073524649
},
{ // 12
    0.0136409510384993,
    0.0272819020769987,
    0.0136409510384993,
    1.8251771922945,
    -0.879740996448497
},
{ // 13
    0.00425040107325392,
    0.00850080214650783,
    0.00425040107325392,
    1.85955186596461,
    -0.876553470257628
},
{ // 14
    0.0321672139532161,
    0.0321672139532161,
    0,
    0.935665572093568,
    0
}
};