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More filtering added.

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This commit is contained in:
Jonathan Naylor
2020-06-10 16:38:10 +01:00
parent 22cb16f831
commit 121c76f3d8
3 changed files with 103 additions and 18 deletions
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AX25Demodulator.cpp
+8 -6
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@@ -30,9 +30,9 @@ const float32_t SAMPLES_PER_SYMBOL = SAMPLE_RATE / SYMBOL_RATE;
const float32_t PLL_LIMIT = SAMPLES_PER_SYMBOL / 2.0F;
// XXX This is for the wrong sample rate
const uint32_t LPF_FILTER_LEN = 96;
const uint32_t LPF_FILTER_LEN = 96U;
q15_t lpfCoeffs[] = {
q15_t LPF_FILTER_COEFFS[] = {
0, 1, 3, 5, 8, 11, 14, 17, 19, 20, 18, 14,
7, -2, -16, -33, -53, -76, -101, -126, -151, -174, -194, -208,
-215, -212, -199, -173, -133, -79, -10, 74, 173, 287, 413, 549,
@@ -48,7 +48,9 @@ q15_t lpfCoeffs[] = {
// loop_coeffs = firwin(9, [64.0/(1200/2)], width = None,
// pass_zero = True, scale = True, window='hann')
//
float32_t pllLoopCoeffs[] = {3.196252e-02F, 1.204223e-01F, 2.176819e-01F, 2.598666e-01F, 2.176819e-01F, 1.204223e-01F, 3.196252e-02F};
const uint32_t PLL_FILTER_LEN = 7U;
float32_t PLL_FILTER_COEFFS[] = {3.196252e-02F, 1.204223e-01F, 2.176819e-01F, 2.598666e-01F, 2.176819e-01F, 1.204223e-01F, 3.196252e-02F};
CAX25Demodulator::CAX25Demodulator(float32_t* coeffs, uint16_t length) :
m_audioFilter(),
@@ -72,11 +74,11 @@ m_pllCount(0.0F)
m_lpfFilter.numTaps = LPF_FILTER_LEN;
m_lpfFilter.pState = m_lpfState;
m_lpfFilter.pCoeffs = lpfCoeffs;
m_lpfFilter.pCoeffs = LPF_FILTER_COEFFS;
m_pllFilter.numTaps = 7U;
m_pllFilter.numTaps = PLL_FILTER_LEN;
m_pllFilter.pState = m_pllState;
m_pllFilter.pCoeffs = pllLoopCoeffs;
m_pllFilter.pCoeffs = PLL_FILTER_COEFFS;
}
bool CAX25Demodulator::process(const q15_t* samples, uint8_t length, CAX25Frame& frame)