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Use IFIR decimation for broadcast FM receiver.

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Jared Boone
2016-01-02 10:35:23 -08:00
parent a02bfe55d0
commit e720bfb054
5 changed files with 67 additions and 23 deletions
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firmware/baseband/dsp_fir_taps.hpp
+21
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@@ -182,6 +182,27 @@ constexpr fir_taps_real<32> taps_6k0_channel {
} },
};
// WFM 200KF8E emission type //////////////////////////////////////////////
constexpr fir_taps_real<24> taps_200k_wfm_decim_0 = {
.pass_frequency_normalized = 100000.0f / 3072000.0f,
.stop_frequency_normalized = 484000.0f / 3072000.0f,
.taps = { {
48, -18, -151, -364, -557, -548, -139, 789,
2187, 3800, 5230, 6071, 6071, 5230, 3800, 2187,
789, -139, -548, -557, -364, -151, -18, 48,
} },
};
constexpr fir_taps_real<16> taps_200k_wfm_decim_1 = {
.pass_frequency_normalized = 100000.0f / 768000.0f,
.stop_frequency_normalized = 284000.0f / 768000.0f,
.taps = { {
-67, -123, 388, 622, -1342, -2185, 4599, 14486,
14486, 4599, -2185, -1342, 622, 388, -123, -67,
} },
};
/* Wideband audio filter */
/* 96kHz int16_t input
* -> FIR filter, <15kHz (0.156fs) pass, >19kHz (0.198fs) stop