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Add the twist processing to the AX25 RX.

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This commit is contained in:
Jonathan Naylor
2020-06-21 21:40:40 +01:00
parent f9fcdc5292
commit e210062365
5 changed files with 373 additions and 260 deletions
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AX25RX.cpp
+10 -249
View File
@@ -20,252 +20,6 @@
#include "Globals.h"
#include "AX25RX.h"
// 1200Hz = -12dB, 2200Hz = 0dB; 3381Hz cutoff; cosine.
q15_t dB12[] = {
176,
-812,
-3916,
-7586,
23536,
-7586,
-3916,
-812,
176
};
// 1200Hz = -11dB, 2200Hz = 0dB; 3258Hz cutoff; cosine.
q15_t dB11[] = {
121,
-957,
-3959,
-7383,
23871,
-7383,
-3959,
-957,
121
};
// 1200Hz = -10dB, 2200Hz = 0dB; 3118Hz cutoff; cosine.
q15_t dB10[] = {
56,
-1110,
-3987,
-7141,
24254,
-7141,
-3987,
-1110,
56
};
// 1200Hz = -9dB, 2200Hz = 0dB; 2959Hz cutoff; cosine.
q15_t dB9[] = {
-19,
-1268,
-3994,
-6856,
24688,
-6856,
-3994,
-1268,
-19
};
// 1200Hz = -8dB, 2200Hz = 0dB; 2778Hz cutoff; cosine.
q15_t dB8[] = {
-104,
-1424,
-3968,
-6516,
25182,
-6516,
-3968,
-1424,
-104
};
// 1200Hz = -7dB, 2200Hz = 0dB; 2573Hz cutoff; cosine.
q15_t dB7[] = {
-196,
-1565,
-3896,
-6114,
25742,
-6114,
-3896,
-1565,
-196
};
// 1200Hz = -6dB, 2200Hz = 0dB; 2343Hz cutoff; cosine.
q15_t dB6[] = {
-288,
-1676,
-3761,
-5642,
26370,
-5642,
-3761,
-1676,
-288
};
// 1200Hz = -5dB, 2200Hz = 0dB; 2085Hz cutoff; cosine.
q15_t dB5[] = {
-370,
-1735,
-3545,
-5088,
27075,
-5088,
-3545,
-1735,
-370
};
// 1200Hz = -4dB, 2200Hz = 0dB; 1790Hz cutoff; cosine.
q15_t dB4[] = {
-432,
-1715,
-3220,
-4427,
27880,
-4427,
-3220,
-1715,
-432
};
// 1200Hz = -3dB, 2200Hz = 0dB; 1456Hz cutoff; cosine.
q15_t dB3[] = {
-452,
-1582,
-2759,
-3646,
28792,
-3646,
-2759,
-1582,
-452
};
// 1200Hz = -2dB, 2200Hz = 0dB; 1070Hz cutoff; cosine.
q15_t dB2[] = {
-408,
-1295,
-2123,
-2710,
29846,
-2710,
-2123,
-1295,
-408
};
// 1200Hz = -1dB, 2200Hz = 0dB; 605Hz cutoff; cosine.
q15_t dB1[] = {
-268,
-795,
-1244,
-1546,
31116,
-1546,
-1244,
-795,
-268
};
q15_t dB0[] = {
0,
0,
0,
0,
32767,
0,
0,
0,
0,
};
// 1200Hz = 0dB, 2200Hz = -1dB; 4130Hz cutoff; cosine.
q15_t dB_1[] = {
-419,
-177,
3316,
8650,
11278,
8650,
3316,
-177,
-419
};
// 1200Hz = 0dB, 2200Hz = -2dB; 3190Hz cutoff; cosine.
q15_t dB_2[] = {
-90,
1033,
3975,
7267,
8711,
7267,
3975,
1033,
-90
};
// 1200Hz = 0dB, 2200Hz = -3dB; 2330Hz cutoff; cosine.
q15_t dB_3[] = {
292,
1680,
3752,
5615,
6362,
5615,
3752,
1680,
292
};
// 1200Hz = 0dB, 2200Hz = -4dB; 2657Hz cutoff; boxcar.
q15_t dB_4[] = {
917,
3024,
5131,
6684,
7255,
6684,
5131,
3024,
917
};
// 1200Hz = 0dB, 2200Hz = -5dB; 2360Hz cutoff; boxcar.
q15_t dB_5[] = {
1620,
3339,
4925,
6042,
6444,
6042,
4925,
3339,
1620
};
// 1200Hz = 0dB, 2200Hz = -6dB; 2067Hz cutoff; boxcar.
q15_t dB_6[] = {
2161,
3472,
4605,
5373,
5644,
5373,
4605,
3472,
2161
};
/*
* Generated with Scipy Filter, 152 coefficients, 1100-2300Hz bandpass,
* Hann window, starting and ending 0 value coefficients removed.
@@ -306,9 +60,9 @@ q15_t FILTER_COEFFS[] = {
CAX25RX::CAX25RX() :
m_filter(),
m_state(),
m_demod1(dB3, 9U),
m_demod2(dB6, 9U),
m_demod3(dB9, 9U),
m_demod1(3),
m_demod2(6),
m_demod3(9),
m_lastFCS(0U)
{
m_filter.numTaps = FILTER_LEN;
@@ -346,3 +100,10 @@ void CAX25RX::samples(q15_t* samples, uint8_t length)
}
}
void CAX25RX::setParams(int8_t twist)
{
m_demod1.setTwist(twist - 3);
m_demod2.setTwist(twist);
m_demod3.setTwist(twist + 3);
}