dec4filter3.h

各种工程计算的库函数

/*

    Decimation filter for rate 4
    Copyright (C) 2001 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 (493 terms).
    Generated by SYSTOLIX Filter Synthesis at 23:25:37 on 10/12/00.
    Specification:
    F1 = 0.1125
    F2 = 0.125
    Passband Ripple = 0.1dB
    Stopband Ripple = 96dB

*/


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


static const long lDec4FilterLen = 493l;

static const float fDec4FilterGain =  1.0f;
static const float fpDec4FilterCoeffs[] = {
6.40238336930001E-07,
4.39556482755848E-07,
-1.46557230294007E-07,
-8.60904214014514E-07,
-1.26624844069931E-06,
-9.9067099366122E-07,
2.65972693627697E-19,
1.28132471554208E-06,
2.12182466193286E-06,
1.87549693365384E-06,
4.17381723985913E-07,
-1.64954220233651E-06,
-3.20133038180018E-06,
-3.17484488900953E-06,
-1.23909102302892E-06,
1.84478838022162E-06,
4.46227618569408E-06,
4.9551581116011E-06,
2.61623226784002E-06,
-1.70320780495004E-06,
-5.81403636161365E-06,
-7.2545392129349E-06,
-4.70791354464412E-06,
1.01777192724507E-06,
7.10742535358304E-06,
1.00666715247575E-05,
7.6674794587024E-06,
4.5759774413432E-07,
-8.12635052705486E-06,
-1.3323479190434E-05,
-1.16245923594751E-05,
-2.99883538427597E-06,
8.58288772021811E-06,
1.68776908109094E-05,
1.666353654196E-05,
6.89681519676643E-06,
-8.11717428930513E-06,
-2.04867671163368E-05,
-2.27985232987246E-05,
-1.24363736260239E-05,
6.30346134588185E-06,
2.37998956085167E-05,
2.99472019695003E-05,
1.9869330287801E-05,
-2.6634979197296E-06,
-2.63499158370287E-05,
-3.79040048996513E-05,
-2.93820481783074E-05,
-3.3118733829897E-06,
2.75520909420535E-05,
4.63153397715383E-05,
4.10586095403252E-05,
1.21324472453503E-05,
-2.67115611878203E-05,
-5.46589560254059E-05,
-5.48412460531906E-05,
-2.42697841188446E-05,
2.3041086417392E-05,
6.22300178411755E-05,
7.04902146512417E-05,
4.01104372405352E-05,
-1.56902978982432E-05,
-6.81364816703167E-05,
-8.75458124166783E-05,
-5.99026772591586E-05,
3.78713708210637E-06,
7.13062740096694E-05,
1.05295632389624E-04,
8.36988425727932E-05,
1.3508528247942E-05,
-7.05084752316741E-05,
-1.22750433914422E-04,
-1.11296158495303E-04,
-3.69399269813221E-05,
6.43902282787352E-05,
1.38632096867165E-04,
1.42179519200197E-04,
6.70787546453362E-05,
-5.15304095127569E-05,
-1.51377015985964E-04,
-1.75470260447299E-04,
-1.04243527471421E-04,
3.05102390883682E-05,
1.59157946461372E-04,
2.09885316691416E-04,
1.48414470278684E-04,
-2.52498996062069E-17,
-1.59926724300016E-04,
-2.43711306151564E-04,
-1.99149323014442E-04,
-4.11400778348652E-05,
1.51479458744656E-04,
2.74797982884279E-04,
2.55505145267349E-04,
9.37478734715767E-05,
-1.31544749266922E-04,
-3.00575108754626E-04,
-3.15971690143865E-04,
-1.58240619890159E-04,
9.78942529322414E-05,
3.18096118255232E-04,
3.78422152497988E-04,
2.34494641237039E-04,
-4.84735718322851E-05,
-3.24110980580585E-04,
-4.40087025519279E-04,
-3.21729774546235E-04,
-1.84499883410647E-05,
3.15169430340972E-04,
4.97556392029889E-04,
4.18405318452348E-04,
1.04127640213473E-04,
-2.87754284331237E-04,
-5.46815217992482E-04,
-5.22134696364848E-04,
-2.09163469303448E-04,
2.3844294910505E-04,
5.83315111469596E-04,
6.29626005996635E-04,
3.33350182221943E-04,
-1.64093531805519E-04,
-6.0208458841433E-04,
-7.36655211959496E-04,
-4.75514338771727E-04,
6.20502875618733E-05,
5.97878197580027E-04,
8.38077904277503E-04,
6.33379627403095E-04,
6.96384267784911E-05,
-5.65362972661234E-04,
-9.27884296992978E-04,
-8.03456784235917E-04,
-2.31997863525017E-04,
4.99338692371469E-04,
9.99300506100823E-04,
9.80968316904397E-04,
4.24909441725918E-04,
-3.94986446806535E-04,
-1.04493717842031E-03,
-1.15981524530298E-03,
-6.46907914219135E-04,
2.48138151601754E-04,
1.05698432010345E-03,
1.33259160451845E-03,
8.95002966653549E-04,
-5.55580478724743E-05,
-1.02744879377319E-03,
-1.49065048709763E-03,
-1.16453453340273E-03,
-1.84773994055346E-04,
9.48428532119262E-04,
1.62422297048718E-03,
1.44906991950672E-03,
4.7338825721157E-04,
-8.12415179796648E-04,
-1.72258843639757E-03,
-1.74034891675563E-03,
-8.09071009281114E-04,
6.12614756021722E-04,
1.77429160630724E-03,
2.02828045628499E-03,
1.18864066184487E-03,
-3.43274156114709E-04,
-1.7673981513398E-03,
-2.30099090429046E-03,
-1.60676297644715E-03,
1.35009320298213E-16,
1.68977702073874E-03,
2.54491980625838E-03,
2.05581146125798E-03,
4.19944409625155E-04,
-1.52939365075574E-03,
-2.74495357068889E-03,
-2.52577532909073E-03,
-9.17378360465003E-04,
1.27459383927905E-03,
2.88458096277923E-03,
3.0042121332929E-03,
1.49099299172532E-03,
-9.14352987909941E-04,
-2.94604578630493E-03,
-3.47623497797338E-03,
-2.13720301496546E-03,
4.38458979259109E-04,
2.91046069929616E-03,
3.9245141396593E-03,
2.85007140600967E-03,
1.62412061193451E-04,
-2.75782973373856E-03,
-4.32925841888348E-03,
-3.6213150048051E-03,
-8.96781796733546E-04,
2.46690199828278E-03,
4.66811949162984E-03,
4.44039586915652E-03,
1.77269543433852E-03,
-2.01473799338412E-03,
-4.91592698464039E-03,
-5.29469974987857E-03,
-2.79840631554718E-03,
1.37579864074386E-03,
5.04410098373801E-03,
6.16979934412867E-03,
3.98361500349516E-03,
-5.2023606259013E-04,
-5.01947718715336E-03,
-7.04979621402685E-03,
-5.34160751188853E-03,
-5.89189348656942E-04,
4.80206296632392E-03,
7.91773161231288E-03,
6.89294233630279E-03,
2.00266514409466E-03,
-4.34079171486629E-03,
-8.75605311897006E-03,
-8.67199906926782E-03,
-3.79361024953873E-03,
3.56533443033022E-03,
9.54712113582459E-03,
1.07392537562682E-02,
6.07869501985071E-03,
-2.36956810753685E-03,
-1.02737370639676E-02,
-1.32061347034678E-02,
-9.05987634484743E-03,
5.75624893616754E-04,
1.09196735270084E-02,
1.62908660090246E-02,
0.013122540254373,
2.15336863375491E-03,
-1.14701863915057E-02,
-0.020462997478356,
-1.91017618401558E-02,
-6.56221333785433E-03,
1.19124886230004E-02,
2.69022121447658E-02,
2.91871273467399E-02,
1.47168864814322E-02,
-1.22361672058026E-02,
-3.95283568000463E-02,
-5.14456338154507E-02,
-3.53017895340215E-02,
1.24335264053273E-02,
8.32672684144886E-02,
0.158614593419976,
0.216050027304557,
0.237497026073657,
0.216050027304557,
0.158614593419976,
8.32672684144886E-02,
1.24335264053273E-02,
-3.53017895340215E-02,
-5.14456338154507E-02,
-3.95283568000463E-02,
-1.22361672058026E-02,
1.47168864814322E-02,
2.91871273467399E-02,
2.69022121447658E-02,
1.19124886230004E-02,
-6.56221333785433E-03,
-1.91017618401558E-02,
-0.020462997478356,
-1.14701863915057E-02,
2.15336863375491E-03,
0.013122540254373,
1.62908660090246E-02,
1.09196735270084E-02,
5.75624893616754E-04,
-9.05987634484743E-03,
-1.32061347034678E-02,
-1.02737370639676E-02,
-2.36956810753685E-03,
6.07869501985071E-03,
1.07392537562682E-02,
9.54712113582459E-03,
3.56533443033022E-03,
-3.79361024953873E-03,
-8.67199906926782E-03,
-8.75605311897006E-03,
-4.34079171486629E-03,
2.00266514409466E-03,
6.89294233630279E-03,
7.91773161231288E-03,
4.80206296632392E-03,
-5.89189348656942E-04,
-5.34160751188853E-03,
-7.04979621402685E-03,
-5.01947718715336E-03,
-5.2023606259013E-04,
3.98361500349516E-03,
6.16979934412867E-03,
5.04410098373801E-03,
1.37579864074386E-03,
-2.79840631554718E-03,
-5.29469974987857E-03,
-4.91592698464039E-03,
-2.01473799338412E-03,
1.77269543433852E-03,
4.44039586915652E-03,
4.66811949162984E-03,
2.46690199828278E-03,
-8.96781796733546E-04,
-3.6213150048051E-03,
-4.32925841888348E-03,
-2.75782973373856E-03,
1.62412061193451E-04,
2.85007140600967E-03,
3.9245141396593E-03,
2.91046069929616E-03,
4.38458979259109E-04,
-2.13720301496546E-03,
-3.47623497797338E-03,
-2.94604578630493E-03,
-9.14352987909941E-04,
1.49099299172532E-03,
3.0042121332929E-03,
2.88458096277923E-03,
1.27459383927905E-03,
-9.17378360465003E-04,
-2.52577532909073E-03,
-2.74495357068889E-03,
-1.52939365075574E-03,
4.19944409625155E-04,
2.05581146125798E-03,
2.54491980625838E-03,
1.68977702073874E-03,
1.35009320298213E-16,
-1.60676297644715E-03,
-2.30099090429046E-03,
-1.7673981513398E-03,
-3.43274156114709E-04,
1.18864066184487E-03,
2.02828045628499E-03,
1.77429160630724E-03,
6.12614756021722E-04,
-8.09071009281114E-04,
-1.74034891675563E-03,
-1.72258843639757E-03,
-8.12415179796648E-04,
4.7338825721157E-04,
1.44906991950672E-03,
1.62422297048718E-03,
9.48428532119262E-04,
-1.84773994055346E-04,
-1.16453453340273E-03,
-1.49065048709763E-03,
-1.02744879377319E-03,
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8.95002966653549E-04,
1.33259160451845E-03,
1.05698432010345E-03,
2.48138151601754E-04,
-6.46907914219135E-04,
-1.15981524530298E-03,
-1.04493717842031E-03,
-3.94986446806535E-04,
4.24909441725918E-04,
9.80968316904397E-04,
9.99300506100823E-04,
4.99338692371469E-04,
-2.31997863525017E-04,
-8.03456784235917E-04,
-9.27884296992978E-04,
-5.65362972661234E-04,
6.96384267784911E-05,
6.33379627403095E-04,
8.38077904277503E-04,
5.97878197580027E-04,
6.20502875618733E-05,
-4.75514338771727E-04,
-7.36655211959496E-04,
-6.0208458841433E-04,
-1.64093531805519E-04,
3.33350182221943E-04,
6.29626005996635E-04,
5.83315111469596E-04,
2.3844294910505E-04,
-2.09163469303448E-04,
-5.22134696364848E-04,
-5.46815217992482E-04,
-2.87754284331237E-04,
1.04127640213473E-04,
4.18405318452348E-04,
4.97556392029889E-04,
3.15169430340972E-04,
-1.84499883410647E-05,
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-4.40087025519279E-04,
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2.34494641237039E-04,
3.78422152497988E-04,
3.18096118255232E-04,
9.78942529322414E-05,
-1.58240619890159E-04,
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9.37478734715767E-05,
2.55505145267349E-04,
2.74797982884279E-04,
1.51479458744656E-04,
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1.48414470278684E-04,
2.09885316691416E-04,
1.59157946461372E-04,
3.05102390883682E-05,
-1.04243527471421E-04,
-1.75470260447299E-04,
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6.70787546453362E-05,
1.42179519200197E-04,
1.38632096867165E-04,
6.43902282787352E-05,
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1.3508528247942E-05,
8.36988425727932E-05,
1.05295632389624E-04,
7.13062740096694E-05,
3.78713708210637E-06,
-5.99026772591586E-05,
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4.01104372405352E-05,
7.04902146512417E-05,
6.22300178411755E-05,
2.3041086417392E-05,
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1.21324472453503E-05,
4.10586095403252E-05,
4.63153397715383E-05,
2.75520909420535E-05,
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1.9869330287801E-05,
2.99472019695003E-05,
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6.30346134588185E-06,
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4.5759774413432E-07,
7.6674794587024E-06,
1.00666715247575E-05,
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1.01777192724507E-06,
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2.61623226784002E-06,
4.9551581116011E-06,
4.46227618569408E-06,