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Remove unneeded zeroes from the band pass FIR filter.

This commit is contained in:
Jonathan Naylor 2020-06-30 17:09:09 +01:00
parent 8d10555dc9
commit 2c6e2c2a11
2 changed files with 17 additions and 16 deletions
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31
AX25RX.cpp
View File

@ -39,22 +39,23 @@
* window='hann') * 32768,
* dtype=int)[10:-10]
*/
const uint32_t FILTER_LEN = 132;
const uint32_t FILTER_LEN = 130U;
q15_t FILTER_COEFFS[] = {
0, 5, 12, 18, 21, 19, 11, -2, -15, -25,
-27, -21, -11, -3, -5, -19, -43, -69, -83, -73,
-35, 27, 98, 155, 180, 163, 109, 39, -20, -45,
-26, 23, 74, 89, 39, -81, -247, -407, -501, -480,
-334, -92, 175, 388, 479, 429, 275, 99, 5, 68,
298, 626, 913, 994, 740, 115, -791, -1770, -2544, -2847,
-2509, -1527, -76, 1518, 2875, 3653, 3653, 2875, 1518, -76,
-1527, -2509, -2847, -2544, -1770, -791, 115, 740, 994, 913,
626, 298, 68, 5, 99, 275, 429, 479, 388, 175,
-92, -334, -480, -501, -407, -247, -81, 39, 89, 74,
23, -26, -45, -20, 39, 109, 163, 180, 155, 98,
27, -35, -73, -83, -69, -43, -19, -5, -3, -11,
-21, -27, -25, -15, -2, 11, 19, 21, 18, 12,
5, 0
5, 12, 18, 21, 19, 11, -2, -15, -25, -27,
-21, -11, -3, -5, -19, -43, -69, -83, -73, -35,
27, 98, 155, 180, 163, 109, 39, -20, -45, -26,
23, 74, 89, 39, -81, -247, -407, -501, -480, -334,
-92, 175, 388, 479, 429, 275, 99, 5, 68, 298,
626, 913, 994, 740, 115, -791, -1770, -2544, -2847, -2509,
-1527, -76, 1518, 2875, 3653, 3653, 2875, 1518, -76, -1527,
-2509, -2847, -2544, -1770, -791, 115, 740, 994, 913, 626,
298, 68, 5, 99, 275, 429, 479, 388, 175, -92,
-334, -480, -501, -407, -247, -81, 39, 89, 74, 23,
-26, -45, -20, 39, 109, 163, 180, 155, 98, 27,
-35, -73, -83, -69, -43, -19, -5, -3, -11, -21,
-27, -25, -15, -2, 11, 19, 21, 18, 12, 5
};
CAX25RX::CAX25RX() :

2
AX25RX.h
View File

@ -33,7 +33,7 @@ public:
private:
arm_fir_instance_q15 m_filter;
q15_t m_state[160U]; // NoTaps + BlockSize - 1, 132 + 20 - 1 plus some spare
q15_t m_state[160U]; // NoTaps + BlockSize - 1, 130 + 20 - 1 plus some spare
CAX25Demodulator m_demod1;
CAX25Demodulator m_demod2;
CAX25Demodulator m_demod3;