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tnc3-firmware/TNC/Filter.cpp

461 wiersze
11 KiB
C++
Czysty Wina Historia

#include "Filter.h"
#include <cstdlib>
const float filter_taps[13][FILTER_TAP_NUM] = {
{
// 0dB Hamming (1693.3)
0.0092140576627,
0.00768806806252,
0.00498340794238,
-0.00171692105003,
-0.0142537522489,
-0.0319314833665,
-0.0509364246735,
-0.0650918044189,
-0.0677825846114,
-0.0544018818,
-0.0244193735639,
0.0177467007765,
0.0634791554618,
0.102191070678,
0.124356477862,
0.124356477862,
0.102191070678,
0.0634791554618,
0.0177467007765,
-0.0244193735639,
-0.0544018818,
-0.0677825846114,
-0.0650918044189,
-0.0509364246735,
-0.0319314833665,
-0.0142537522489,
-0.00171692105003,
0.00498340794238,
0.00768806806252,
0.0092140576627,
},
{
// 1dB Hamming (1749.2)
0.00984360063296,
0.00907660156831,
0.00733802154094,
0.00165885599255,
-0.01027803496,
-0.028288428514,
-0.0487844743735,
-0.0653441331879,
-0.0706814843758,
-0.0593532384181,
-0.0301832127721,
0.0125781304703,
0.0599187881831,
0.100456125433,
0.123807723158,
0.123807723158,
0.100456125433,
0.0599187881831,
0.0125781304703,
-0.0301832127721,
-0.0593532384181,
-0.0706814843758,
-0.0653441331879,
-0.0487844743735,
-0.028288428514,
-0.01027803496,
0.00165885599255,
0.00733802154094,
0.00907660156831,
0.00984360063296,
},
{
// 2dB Hamming (1805.6)
0.0101071938454,
0.0101751907488,
0.00949571140771,
0.00500536790767,
-0.00608985117047,
-0.0241824665512,
-0.0460028160886,
-0.0649487308381,
-0.0730641303456,
-0.0640057046058,
-0.0358585166096,
0.00736846731409,
0.0562886910258,
0.098688560769,
0.12326772148,
0.12326772148,
0.098688560769,
0.0562886910258,
0.00736846731409,
-0.0358585166096,
-0.0640057046058,
-0.0730641303456,
-0.0649487308381,
-0.0460028160886,
-0.0241824665512,
-0.00608985117047,
0.00500536790767,
0.00949571140771,
0.0101751907488,
0.0101071938454,
},
{
// 3dB Hamming (1861.5)
0.00999732596792,
0.0109364331138,
0.0113663405297,
0.00819091080479,
-0.00184492788726,
-0.0197616766146,
-0.0426984518018,
-0.0639498932619,
-0.0749094986595,
-0.0682876192213,
-0.0413467222516,
0.00222026614421,
0.0526805390514,
0.0969649735461,
0.1228029701,
0.1228029701,
0.0969649735461,
0.0526805390514,
0.00222026614421,
-0.0413467222516,
-0.0682876192213,
-0.0749094986595,
-0.0639498932619,
-0.0426984518018,
-0.0197616766146,
-0.00184492788726,
0.00819091080479,
0.0113663405297,
0.0109364331138,
0.00999732596792,
},
{
// 4dB Hamming (1917.0)
0.00953170942079,
0.0113523463692,
0.012917947221,
0.0111611200433,
0.00238829862135,
-0.0150956296368,
-0.0389313364275,
-0.0623942365343,
-0.07625339099,
-0.0722276074899,
-0.0466690276902,
-0.00287524097904,
0.0491038547992,
0.095314261046,
0.122454987694,
0.122454987694,
0.095314261046,
0.0491038547992,
-0.00287524097904,
-0.0466690276902,
-0.0722276074899,
-0.07625339099,
-0.0623942365343,
-0.0389313364275,
-0.0150956296368,
0.00238829862135,
0.0111611200433,
0.012917947221,
0.0113523463692,
0.00953170942079,
},
{
// 5dB Hamming (1972.5)
0.00872938144139,
0.011420928511,
0.0141310255503,
0.0138829549523,
0.00657217070647,
-0.0102167866884,
-0.0347251133165,
-0.0603020097307,
-0.0771226785494,
-0.0758651302103,
-0.0518731312861,
-0.00796039989017,
0.0455363026357,
0.0937399215189,
0.122245216908,
0.122245216908,
0.0937399215189,
0.0455363026357,
-0.00796039989017,
-0.0518731312861,
-0.0758651302103,
-0.0771226785494,
-0.0603020097307,
-0.0347251133165,
-0.0102167866884,
0.00657217070647,
0.0138829549523,
0.0141310255503,
0.011420928511,
0.00872938144139,
},
{
// 6dB Hamming (2027.0)
0.00763984171566,
0.0111488308293,
0.0149655370284,
0.0162631703876,
0.0105693777806,
-0.00527673382432,
-0.0302054840484,
-0.0577401237325,
-0.077513860058,
-0.079139201575,
-0.0568701896276,
-0.0129510233888,
0.0420349410452,
0.0922665002,
0.122176947883,
0.122176947883,
0.0922665002,
0.0420349410452,
-0.0129510233888,
-0.0568701896276,
-0.079139201575,
-0.077513860058,
-0.0577401237325,
-0.0302054840484,
-0.00527673382432,
0.0105693777806,
0.0162631703876,
0.0149655370284,
0.0111488308293,
0.00763984171566,
},
{
// 7dB Cosine (1986.0)
0.00460770532874,
0.0162873765157,
0.0251984580718,
0.0248176615108,
0.0117845748105,
-0.0125423969002,
-0.0421426113528,
-0.0680353327511,
-0.0811090126152,
-0.0751714219734,
-0.0492188545506,
-0.00815365116672,
0.038335087686,
0.0784276419333,
0.101570441881,
0.101570441881,
0.0784276419333,
0.038335087686,
-0.00815365116672,
-0.0492188545506,
-0.0751714219734,
-0.0811090126152,
-0.0680353327511,
-0.0421426113528,
-0.0125423969002,
0.0117845748105,
0.0248176615108,
0.0251984580718,
0.0162873765157,
0.00460770532874,
},
{
// 8dB Cosine (2021.0, 2021.1)
0.00420597097315,
0.0159601020805,
0.0260190570929,
0.0273151975444,
0.0157146317097,
-0.00808663238039,
-0.0383509470879,
-0.0659043862717,
-0.0810670338405,
-0.0769492259504,
-0.0520051674945,
-0.0109566710433,
0.0362780863637,
0.0773640302855,
0.101184010968,
0.101184010968,
0.0773640302855,
0.0362780863637,
-0.0109566710433,
-0.0520051674945,
-0.0769492259504,
-0.0810670338405,
-0.0659043862717,
-0.0383509470879,
-0.00808663238039,
0.0157146317097,
0.0273151975444,
0.0260190570929,
0.0159601020805,
0.00420597097315,
},
{
// 9dB Hamming (2186.5)
0.00308518474955,
0.00850291315071,
0.0151934174423,
0.0211164164746,
0.0210280537958,
0.00946135065651,
-0.0151061442669,
-0.0474011160773,
-0.0758516294354,
-0.0867915071262,
-0.0707058729109,
-0.0275514181864,
0.0316531744803,
0.0881474710462,
0.122515729369,
0.122515729369,
0.0881474710462,
0.0316531744803,
-0.0275514181864,
-0.0707058729109,
-0.0867915071262,
-0.0758516294354,
-0.0474011160773,
-0.0151061442669,
0.00946135065651,
0.0210280537958,
0.0211164164746,
0.0151934174423,
0.00850291315071,
0.00308518474955,
},
{
// 10dB Cosine (2087.0, 2087.1)
0.003297704105,
0.0148243949961,
0.0268172892254,
0.0313287864329,
0.0227440831014,
0.00036329489673,
-0.0307896841323,
-0.061300901507,
-0.0804397189579,
-0.0799281940065,
-0.0570830747612,
-0.0161917885552,
0.0324263666501,
0.0754301963068,
0.100574174183,
0.100574174183,
0.0754301963068,
0.0324263666501,
-0.0161917885552,
-0.0570830747612,
-0.0799281940065,
-0.0804397189579,
-0.061300901507,
-0.0307896841323,
0.00036329489673,
0.0227440831014,
0.0313287864329,
0.0268172892254,
0.0148243949961,
0.003297704105,
},
{
// 11dB Cosine (2119.0, 2119.1)
0.00279757679371,
0.0140443163212,
0.0268514195956,
0.0329271588621,
0.0259396342176,
0.00444730813715,
-0.0269594711541,
-0.0588146601004,
-0.0798925711826,
-0.0812085944654,
-0.0594715656311,
-0.01871136648,
0.0305735278948,
0.0745360339334,
0.100349256713,
0.100349256713,
0.0745360339334,
0.0305735278948,
-0.01871136648,
-0.0594715656311,
-0.0812085944654,
-0.0798925711826,
-0.0588146601004,
-0.0269594711541,
0.00444730813715,
0.0259396342176,
0.0329271588621,
0.0268514195956,
0.0140443163212,
0.00279757679371,
},
{
// 12dB Cosine (2150,2151)
0.0022752196356,
0.0131417834537,
0.0266616639804,
0.0342658094422,
0.028925742996,
0.00843279814311,
-0.0231061648363,
-0.0562188716332,
-0.0792056020955,
-0.0823667306435,
-0.0617763153975,
-0.0211791883525,
0.0287608072456,
0.0736871278906,
0.100177853829,
0.100177853829,
0.0736871278906,
0.0287608072456,
-0.0211791883525,
-0.0617763153975,
-0.0823667306435,
-0.0792056020955,
-0.0562188716332,
-0.0231061648363,
0.00843279814311,
0.028925742996,
0.0342658094422,
0.0266616639804,
0.0131417834537,
0.0022752196356,
}
};
void Filter_init(Filter* f, const float* taps) {
for (size_t i = 0; i != FILTER_TAP_NUM; ++i) {
f->history[i] = 0;
f->taps[i] = taps[i]; // initialize ccmram.
}
f->last_index = 0;
}
void Filter_put(Filter* f, float input) {
f->history[f->last_index++] = input;
if (f->last_index == FILTER_TAP_NUM)
f->last_index = 0;
}
float Filter_get(Filter* f) {
float acc = 0;
int index = f->last_index, i;
for (i = 0; i < FILTER_TAP_NUM; ++i) {
index = index != 0 ? index - 1 : FILTER_TAP_NUM - 1;
acc += f->history[index] * f->taps[i];
};
return acc;
}
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