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Adding_BPF_selection_to_the_NOAA_APT_signal (#2675)

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* Adding_BPF_selection_to_the_NOAA_APT_signal
* comments, spell mistake .
This commit is contained in:
Brumi-2021
2025-06-02 14:40:13 +02:00
committed by GitHub
parent 6e9ecf8e7b
commit 695e6d19f4
6 changed files with 33 additions and 10 deletions
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20
firmware/common/dsp_fir_taps.hpp
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@@ -1491,6 +1491,26 @@ constexpr fir_taps_real<64> taps_64_lp_1875_2166{
}},
};
/* 1st Wideband FM demod baseband filter of audio AM tones ,
to pass all DSB band of AM fsubcarrier 2.4Khz mod. with APT */
/* 24kHz int16_t input
* -> FIR filter, BPF center 2k4 carrier ,APT BW 2kHz
* -> 12kHz int16_t output, gain of 1.0 (I think).
*/
constexpr fir_taps_real<64> taps_64_bpf_2k4_bw_2k{
.low_frequency_normalized = -0.1875f, // not updated, this is just for LPF , waterfall GUI, we are not using in HPF NOAA app.
.high_frequency_normalized = 0.1875f, // not used GUI in NOAA App.
.transition_normalized = 0.03f, // not used GUI in NOAA app.
.taps = {{-45, -29, 32, 63, 0, -125, -181, -81, 61,
0, -329, -635, -551, -147, 0, -547, -1404, -1625,
-849, 0, -414, -2118, -3358, -2422, 0, 911, -1792,
-6126, -6773, 0, 11839, 21131, 21131, 11839, 0, -6773,
-6126, -1792, 911, 0, -2422, -3358, -2118, -414, 0,
-849, -1625, -1404, -547, 0, -147, -551, -635, -329,
0, 61, -81, -181, -125, 0, 63, 32, -29,
-45}},
};
// TPMS decimation filters ////////////////////////////////////////////////
// IFIR image-reject filter: fs=2457600, pass=100000, stop=407200, decim=4, fout=614400