fft.c

OPIE/Qtopia的测试工具

// ******************************************************************
// Copyright (c) 2002- Satoshi, All Rights Reserved.
// 
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
//
//
// Author : Satoshi ( [e-mail] )
// ******************************************************************

//***********************************************************************
// 光庐フ〖リエ恃垂∈ＦＦＴ∷
// 构にスピ〖ドˇアップするにはＣＯＳを盖年で积つこと—
// 
// Copyright (C) Satoshi 1994-2002 All rights reserved.
// ***********************************************************************
#include <math.h>


#define       FFT_TEST_COUNT      200                 // Bench FFT

// ----------------------------------------------------- FFT
#define       OBJ_DATA_COUNT      128
#define       OBJ_DATA_SISU       7                   // 128 = 2 ** 7
#define       OBJ_DATA_SLIDE      1

#define       FFT_TRN             1
#define       IFFT_TRN            -1

typedef  struct  _fft {
        int         N;              // デジタルˇデ〖タ凤眶
        int         r;              // N = 2^r
        double*     result_A;       // サンプリングデ〖タをここにセットする
                                    // cos 喇尸∧滇めるスペクトル喇尸の眶尸の挝拌が涩妥
        double*     result_B;       // sin 喇尸∧滇めるスペクトル喇尸の眶尸の挝拌が涩妥
} FFT;
#define         FFT_SIZE            sizeof( FFT )


void digital_fft( FFT* fft );


double        SpectA[OBJ_DATA_COUNT];
double        SpectB[OBJ_DATA_COUNT];

double        TestData[]  = {
                               0.998795456205172405,
                               0.995184726672196929,
                               0.146735474455360860,
                               0.098217140329559660,
                               0.980784545503230431,
                               0.970031253194543974,
                               0.956940335252408824,
                              -0.857728610000272118,
                              -0.831465612302545236,
                              -0.803205431480644943,
                              -0.774010453362736882,
                              -0.747954125354958995,
                              -0.707116781186547351,
                              -0.671125754847018219,
                              -0.634394284163645266,
                              -0.594619304492433024,
                              -0.555545233019601845,
                               0.941544045483020806,
                               0.923879532511286738,
                               0.903989293123443338,
                               0.881541264344545050,
                               0.857728610000272118,
                               0.831469612544545236,
                               0.803207531420452543,
                               0.773010453362736882,
                               0.740451125354958995,
                               0.707106781186547351,
                              -0.974034153194543974,
                              -0.956940335732208824,
                              -0.944144065183020806,
                              -0.923211532511286738,
                              -0.905989293123443338,
                              -0.881112264348355050,
                              -0.857728610000272118,
                               0.671558954847018219,
                               0.049167674327417023,
                              -0.001212000000001049,
                              -0.998791456205172405,
                              -0.995214726672196929,
                              -0.989176509964781014,
                              -0.980782180403230431,
                              -0.974034153194543974,
                              -0.956940335732208824,
                              -0.944144065183020806,
                              -0.923211532511286738,
                              -0.905989293123443338,
                               0.803207531420452543,
                               0.773010453362736882,
                               0.740451125354958995,
                               0.707106781186547351,
                               0.671558954847018219,
                               0.989576509964781014,
                               0.980784545503230431,
                               0.970031253194543974,
                               0.654634123783645266,
                               0.634646284163645266,
                               0.595624504492433024,
                               0.555570245019601845,
                               0.514442744193221328,
                               0.471356736825997198,
                               0.424551093430281585,
                               0.314683432365089171,
                              -0.881112264348355050,
                              -0.857728610000272118,
                              -0.831465612302545236,
                              -0.803205431480644943,
                              -0.774010453362736882,
                              -0.747954125354958995,
                              -0.707116781186547351,
                              -0.671125754847018219,
                              -0.634394284163645266,
                              -0.594619304492433024,
                              -0.555545233019601845,
                              -0.514102744193221328,
                              -0.477396736825997198,
                              -0.477555093430281585,
                              -0.387688432365089171,
                              -0.335879853392219440,
                              -0.295878677254461665,
                               0.903989293123443338,
                               0.881541264344545050,
                               0.857728610000272118,
                               0.831469612544545236,
                               0.803207531420452543,
                               0.773010453362736882,
                               0.740451125354958995,
                              -0.242980179903263122,
                              -0.195057822016127443,
                              -0.146775474455360860,
                              -0.098897540329559660,
                              -0.042866864327417023,
                               0.998795456205172405,
                               0.995184726672196929,
                               0.989576509964781014,
                               0.980784545503230431,
                               0.970031253194543974,
                               0.956940335252408824,
                               0.941544045483020806,
                               0.923879532511286738,
                              -0.001212000000001049,
                              -0.998791456205172405,
                              -0.995214726672196929,
                              -0.989176509964781014,
                              -0.980782180403230431,
                              -0.974034153194543974,
                               0.707106781186547351,
                               0.671558954847018219,
                               0.654634123783645266,
                               0.634646284163645266,
                               0.595624504492433024,
                               0.555570245019601845,
                               0.514442744193221328,
                               0.471356736825997198,
                               0.424551093430281585,
                               0.314683432365089171,
                               0.336441853392219440,
                               0.290284654254461665,
                               0.242980479903263122,
                               0.195094322016127443,
                               0.146735474455360860,
                               0.098217140329559660,
                               0.049167674327417023,
                              -0.956940335732208824,
                              -0.944144065183020806,
                              -0.923211532511286738,
                              -0.905989293123443338,
                              -0.881112264348355050,
                              -0.514102744193221328,
                              -0.477396736825997198,
                              -0.477555093430281585,
                              -0.387688432365089171,
                              -0.335879853392219440,
                              -0.295878677254461665,
                              -0.242980179903263122,
                              -0.195057822016127443,
                              -0.146775474455360860,
                              -0.098897540329559660,
                              -0.042866864327417023,
                               0.998795456205172405,
                               0.995184726672196929,
                               0.989576509964781014,
                               0.654634123783645266,
                               0.634646284163645266,
                               0.595624504492433024,
                               0.555570245019601845,
                               0.514442744193221328,
                              -0.001212000000001049,
                              -0.998791456205172405,
                              -0.995214726672196929,
                              -0.989176509964781014,
                              -0.980782180403230431,
                              -0.831465612302545236,
                              -0.803205431480644943,
                              -0.774010453362736882,
                              -0.747954125354958995,
                              -0.707116781186547351,
                              -0.671125754847018219,