想问一下 那些数组是旋转因子吗? 是怎么得来的 直接用就行吗
看了圈圈的程序数组如下 不一样呀 不明白
#ifdef USE_TABLE
#if LENGTH==32
//计算余弦用的表,放大了1024倍(32点FFT时用)
const short int COS_TABLE[LENGTH/2]=
{
1024,1004,946,851,724,569,392,200,0,-200,
-392,-569,-724,-851,-946
};
//计算正弦用的表,放大了1024倍(32点FFT时用)
const short int SIN_TABLE[LENGTH/2]=
{
0,200,392,569,724,851,946,1004,1024,1004,
946,851,724,569,392
};
#endif
#if LENGTH==64
//计算余弦用的表,放大了1024倍(64点FFT时用)
const short int COS_TABLE[LENGTH/2]=
{
1024,1019,1004,980,946,903,851,792,724,650,
569,483,392,297,200,100,0,-100,-200,-297,
-392,-483,-569,-650,-724,-792,-851,-903,-946,-980,
-1004,-1019
};
//计算正弦用的表,放大了1024倍(64点FFT时用)
const short int SIN_TABLE[LENGTH/2]=
{
0,100,200,297,392,483,569,650,724,792,
851,903,946,980,1004,1019,1024,1019,1004,980,
946,903,851,792,724,650,569,483,392,297,
200,100
};
#endif
#if LENGTH==128
//计算余弦用的表,放大了1024倍(128点FFT时用)
const short int COS_TABLE[LENGTH/2]=
{
1024,1023,1019,1013,1004,993,980,964,946,926,
903,878,851,822,792,759,724,688,650,610,
569,526,483,438,392,345,297,249,200,150,
100,50,0,-50,-100,-150,-200,-249,-297,-345,
-392,-438,-483,-526,-569,-610,-650,-688,-724,-759,
-792,-822,-851,-878,-903,-926,-946,-964,-980,-993,
-1004,-1013,-1019,-1023
};
//计算正弦用的表,放大了1024倍(128点FFT时用)
const short int SIN_TABLE[LENGTH/2]=
{
0,50,100,150,200,249,297,345,392,438,
483,526,569,610,650,688,724,759,792,822,
851,878,903,926,946,964,980,993,1004,1013,
1019,1023,1024,1023,1019,1013,1004,993,980,964,
946,926,903,878,851,822,792,759,724,688,
650,610,569,526,483,438,392,345,297,249,
200,150,100,50
};
#endif
#if LENGTH==256
//计算余弦用的表,放大了1024倍(256点FFT时用)
const short int COS_TABLE[LENGTH/2]=
{
1024,1024,1023,1021,1019,1016,1013,1009,1004,999,
993,987,980,972,964,955,946,936,926,915,
903,891,878,865,851,837,822,807,792,775,
759,742,724,706,688,669,650,630,610,590,
569,548,526,505,483,460,438,415,392,369,
345,321,297,273,249,224,200,175,150,125,
100,75,50,25,0,-25,-50,-75,-100,-125,
-150,-175,-200,-224,-249,-273,-297,-321,-345,-369,
-392,-415,-438,-460,-483,-505,-526,-548,-569,-590,
-610,-630,-650,-669,-688,-706,-724,-742,-759,-775,
-792,-807,-822,-837,-851,-865,-878,-891,-903,-915,
-926,-936,-946,-955,-964,-972,-980,-987,-993,-999,
-1004,-1009,-1013,-1016,-1019,-1021,-1023,-1024
};
//计算正弦用的表,放大了1024倍(256点FFT时用)
const short int SIN_TABLE[LENGTH/2]=
{
0,25,50,75,100,125,150,175,200,224,
249,273,297,321,345,369,392,415,438,460,
483,505,526,548,569,590,610,630,650,669,
688,706,724,742,759,775,792,807,822,837,
851,865,878,891,903,915,926,936,946,955,
964,972,980,987,993,999,1004,1009,1013,1016,
1019,1021,1023,1024,1024,1024,1023,1021,1019,1016,
1013,1009,1004,999,993,987,980,972,964,955,
946,936,926,915,903,891,878,865,851,837,
822,807,792,775,759,742,724,706,688,669,
650,630,610,590,569,548,526,505,483,460,
438,415,392,369,345,321,297,273,249,224,
200,175,150,125,100,75,50,25
};
#endif
#if LENGTH==512
//计算余弦用的表,放大了1024倍(512点FFT时用)
const short int COS_TABLE[LENGTH/2]=
{
1024,1024,1024,1023,1023,1022,1021,1020,1019,1018,
1016,1015,1013,1011,1009,1007,1004,1002,999,996,
993,990,987,983,980,976,972,968,964,960,
955,951,946,941,936,931,926,920,915,909,
903,897,891,885,878,872,865,858,851,844,
837,830,822,815,807,799,792,784,775,767,
759,750,742,733,724,715,706,697,688,678,
669,659,650,640,630,620,610,600,590,579,
569,558,548,537,526,516,505,494,483,472,
460,449,438,426,415,403,392,380,369,357,
345,333,321,309,297,285,273,261,249,237,
224,212,200,187,175,163,150,138,125,113,
100,88,75,63,50,38,25,13,0,-13,
-25,-38,-50,-63,-75,-88,-100,-113,-125,-138,
-150,-163,-175,-187,-200,-212,-224,-237,-249,-261,
-273,-285,-297,-309,-321,-333,-345,-357,-369,-380,
-392,-403,-415,-426,-438,-449,-460,-472,-483,-494,
-505,-516,-526,-537,-548,-558,-569,-579,-590,-600,
-610,-620,-630,-640,-650,-659,-669,-678,-688,-697,
-706,-715,-724,-733,-742,-750,-759,-767,-775,-784,
-792,-799,-807,-815,-822,-830,-837,-844,-851,-858,
-865,-872,-878,-885,-891,-897,-903,-909,-915,-920,
-926,-931,-936,-941,-946,-951,-955,-960,-964,-968,
-972,-976,-980,-983,-987,-990,-993,-996,-999,-1002,
-1004,-1007,-1009,-1011,-1013,-1015,-1016,-1018,-1019,-1020,
-1021,-1022,-1023,-1023,-1024,-1024
};
//计算正弦用的表,放大了1024倍(512点FFT时用)
const short int SIN_TABLE[LENGTH/2]=
{
0,13,25,38,50,63,75,88,100,113,
125,138,150,163,175,187,200,212,224,237,
249,261,273,285,297,309,321,333,345,357,
369,380,392,403,415,426,438,449,460,472,
483,494,505,516,526,537,548,558,569,579,
590,600,610,620,630,640,650,659,669,678,
688,697,706,715,724,733,742,750,759,767,
775,784,792,799,807,815,822,830,837,844,
851,858,865,872,878,885,891,897,903,909,
915,920,926,931,936,941,946,951,955,960,
964,968,972,976,980,983,987,990,993,996,
999,1002,1004,1007,1009,1011,1013,1015,1016,1018,
1019,1020,1021,1022,1023,1023,1024,1024,1024,1024,
1024,1023,1023,1022,1021,1020,1019,1018,1016,1015,
1013,1011,1009,1007,1004,1002,999,996,993,990,
987,983,980,976,972,968,964,960,955,951,
946,941,936,931,926,920,915,909,903,897,
891,885,878,872,865,858,851,844,837,830,
822,815,807,799,792,784,775,767,759,750,
742,733,724,715,706,697,688,678,669,659,
650,640,630,620,610,600,590,579,569,558,
548,537,526,516,505,494,483,472,460,449,
438,426,415,403,392,380,369,357,345,333,
321,309,297,285,273,261,249,237,224,212,
200,187,175,163,150,138,125,113,100,88,
75,63,50,38,25,13
};
#endif
#if LENGTH==1024
//计算余弦用的表,放大了1024倍(1024点FFT时用)
const short int COS_TABLE[LENGTH/2]=
{
1024,1024,1024,1024,1024,1024,1023,1023,1023,1022,
1022,1022,1021,1021,1020,1020,1019,1018,1018,1017,
1016,1016,1015,1014,1013,1012,1011,1010,1009,1008,
1007,1006,1004,1003,1002,1000,999,998,996,995,
993,992,990,989,987,985,983,982,980,978,
976,974,972,970,968,966,964,962,960,958,
955,953,951,948,946,944,941,939,936,934,
931,928,926,923,920,917,915,912,909,906,
903,900,897,894,891,888,885,882,878,875,
872,868,865,862,858,855,851,848,844,841,
837,834,830,826,822,819,815,811,807,803,
799,796,792,788,784,779,775,771,767,763,
759,755,750,746,742,737,733,729,724,720,
715,711,706,702,697,692,688,683,678,674,
669,664,659,654,650,645,640,635,630,625,
620,615,610,605,600,595,590,584,579,574,
569,564,558,553,548,543,537,532,526,521,
516,510,505,499,494,488,483,477,472,466,
460,455,449,443,438,432,426,421,415,409,
403,398,392,386,380,374,369,363,357,351,
345,339,333,327,321,315,309,303,297,291,
285,279,273,267,261,255,249,243,237,230,
224,218,212,206,200,194,187,181,175,169,
163,156,150,144,138,132,125,119,113,107,
100,94,88,82,75,69,63,57,50,44,
38,31,25,19,13,6,0,-6,-13,-19,
-25,-31,-38,-44,-50,-57,-63,-69,-75,-82,
-88,-94,-100,-107,-113,-119,-125,-132,-138,-144,
-150,-156,-163,-169,-175,-181,-187,-194,-200,-206,
-212,-218,-224,-230,-237,-243,-249,-255,-261,-267,
-273,-279,-285,-291,-297,-303,-309,-315,-321,-327,
-333,-339,-345,-351,-357,-363,-369,-374,-380,-386,
-392,-398,-403,-409,-415,-421,-426,-432,-438,-443,
-449,-455,-460,-466,-472,-477,-483,-488,-494,-499,
-505,-510,-516,-521,-526,-532,-537,-543,-548,-553,
-558,-564,-569,-574,-579,-584,-590,-595,-600,-605,
-610,-615,-620,-625,-630,-635,-640,-645,-650,-654,
-659,-664,-669,-674,-678,-683,-688,-692,-697,-702,
-706,-711,-715,-720,-724,-729,-733,-737,-742,-746,
-750,-755,-759,-763,-767,-771,-775,-779,-784,-788,
-792,-796,-799,-803,-807,-811,-815,-819,-822,-826,
-830,-834,-837,-841,-844,-848,-851,-855,-858,-862,
-865,-868,-872,-875,-878,-882,-885,-888,-891,-894,
-897,-900,-903,-906,-909,-912,-915,-917,-920,-923,
-926,-928,-931,-934,-936,-939,-941,-944,-946,-948,
-951,-953,-955,-958,-960,-962,-964,-966,-968,-970,
-972,-974,-976,-978,-980,-982,-983,-985,-987,-989,
-990,-992,-993,-995,-996,-998,-999,-1000,-1002,-1003,
-1004,-1006,-1007,-1008,-1009,-1010,-1011,-1012,-1013,-1014,
-1015,-1016,-1016,-1017,-1018,-1018,-1019,-1020,-1020,-1021,
-1021,-1022,-1022,-1022,-1023,-1023,-1023,-1024,-1024,-1024,
-1024,-1024
};
//计算正弦用的表,放大了1024倍(1024点FFT时用)
const short int SIN_TABLE[LENGTH/2]=
{
0,6,13,19,25,31,38,44,50,57,
63,69,75,82,88,94,100,107,113,119,
125,132,138,144,150,156,163,169,175,181,
187,194,200,206,212,218,224,230,237,243,
249,255,261,267,273,279,285,291,297,303,
309,315,321,327,333,339,345,351,357,363,
369,374,380,386,392,398,403,409,415,421,
426,432,438,443,449,455,460,466,472,477,
483,488,494,499,505,510,516,521,526,532,
537,543,548,553,558,564,569,574,579,584,
590,595,600,605,610,615,620,625,630,635,
640,645,650,654,659,664,669,674,678,683,
688,692,697,702,706,711,715,720,724,729,
733,737,742,746,750,755,759,763,767,771,
775,779,784,788,792,796,799,803,807,811,
815,819,822,826,830,834,837,841,844,848,
851,855,858,862,865,868,872,875,878,882,
885,888,891,894,897,900,903,906,909,912,
915,917,920,923,926,928,931,934,936,939,
941,944,946,948,951,953,955,958,960,962,
964,966,968,970,972,974,976,978,980,982,
983,985,987,989,990,992,993,995,996,998,
999,1000,1002,1003,1004,1006,1007,1008,1009,1010,
1011,1012,1013,1014,1015,1016,1016,1017,1018,1018,
1019,1020,1020,1021,1021,1022,1022,1022,1023,1023,
1023,1024,1024,1024,1024,1024,1024,1024,1024,1024,
1024,1024,1023,1023,1023,1022,1022,1022,1021,1021,
1020,1020,1019,1018,1018,1017,1016,1016,1015,1014,
1013,1012,1011,1010,1009,1008,1007,1006,1004,1003,
1002,1000,999,998,996,995,993,992,990,989,
987,985,983,982,980,978,976,974,972,970,
968,966,964,962,960,958,955,953,951,948,
946,944,941,939,936,934,931,928,926,923,
920,917,915,912,909,906,903,900,897,894,
891,888,885,882,878,875,872,868,865,862,
858,855,851,848,844,841,837,834,830,826,
822,819,815,811,807,803,799,796,792,788,
784,779,775,771,767,763,759,755,750,746,
742,737,733,729,724,720,715,711,706,702,
697,692,688,683,678,674,669,664,659,654,
650,645,640,635,630,625,620,615,610,605,
600,595,590,584,579,574,569,564,558,553,
548,543,537,532,526,521,516,510,505,499,
494,488,483,477,472,466,460,455,449,443,
438,432,426,421,415,409,403,398,392,386,
380,374,369,363,357,351,345,339,333,327,
321,315,309,303,297,291,285,279,273,267,
261,255,249,243,237,230,224,218,212,206,
200,194,187,181,175,169,163,156,150,144,
138,132,125,119,113,107,100,94,88,82,
75,69,63,57,50,44,38,31,25,19,
13,6
};
#endif
#endif |