From 4cc2ba690b0059f5fadcf2a690f3916e51acf25b Mon Sep 17 00:00:00 2001
From: Sandbox <143267209+Win-Sandbox@users.noreply.github.com>
Date: Mon, 23 Feb 2026 03:53:26 +0800
Subject: [PATCH] Add 12k5 RXBW to NFM Mode (#3023)

* Add 12k5 option to NFM
* Updated freqman_db
* Add 12k5 RXBW to NFM
* Add 12k5 RXBW
* formating
---
 firmware/application/apps/ui_mictx.hpp  |  3 ++-
 firmware/application/freqman_db.cpp     |  3 ++-
 firmware/application/receiver_model.cpp |  3 ++-
 firmware/common/dsp_fir_taps.hpp        | 31 +++++++++++++++++++++++++
 4 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/firmware/application/apps/ui_mictx.hpp b/firmware/application/apps/ui_mictx.hpp
index bbeac2392..770d7cf2a 100644
--- a/firmware/application/apps/ui_mictx.hpp
+++ b/firmware/application/apps/ui_mictx.hpp
@@ -304,7 +304,8 @@ class MicTXView : public View {
         {
             {" 8k5  ", 0},  // Initial dynamic values when we start Mic App.
             {" 11k  ", 1},
-            {" 16k  ", 2},
+            {" 12k5  ", 2},
+            {" 16k  ", 3},
         }};
 
     NumberField field_squelch{
diff --git a/firmware/application/freqman_db.cpp b/firmware/application/freqman_db.cpp
index d899f979f..615b75cf4 100644
--- a/firmware/application/freqman_db.cpp
+++ b/firmware/application/freqman_db.cpp
@@ -66,7 +66,8 @@ options_t freqman_bandwidths[6] = {
         // NFM
         {"8k5", 0},
         {"11k", 1},
-        {"16k", 2},
+        {"12k5", 2},
+        {"16k", 3},
     },
     {
         // WFM
diff --git a/firmware/application/receiver_model.cpp b/firmware/application/receiver_model.cpp
index c335d0c46..cd4159afb 100644
--- a/firmware/application/receiver_model.cpp
+++ b/firmware/application/receiver_model.cpp
@@ -63,9 +63,10 @@ static constexpr std::array<baseband::AMConfig, 12> am_configs{{
     {taps_6k0_narrow_decim_1, taps_6k0_decim_2, taps_2k6_usb_wefax_channel, AMConfigureMessage::Modulation::SSB_FM, apt_audio_12k_lpf_1500hz_config, (int)AMConfigureMessage::Zoom_waterfall::ZOOM_x_2},  // SSB USB+FM  to demod. Subcarrier FM Audio Tones to get APT Weather Fax with waterfall zoom x 2 (we need taps_6k0_narrow_decim_1 to minimize aliasing)
 }};
 
-static constexpr std::array<baseband::NBFMConfig, 3> nbfm_configs{{
+static constexpr std::array<baseband::NBFMConfig, 4> nbfm_configs{{
     {taps_4k25_decim_0, taps_4k25_decim_1, taps_4k25_channel, 2500},
     {taps_11k0_decim_0, taps_11k0_decim_1, taps_11k0_channel, 2500},
+    {taps_12k5_decim_0, taps_12k5_decim_1, taps_12k5_channel, 2500},
     {taps_16k0_decim_0, taps_16k0_decim_1, taps_16k0_channel, 5000},
 }};
 
diff --git a/firmware/common/dsp_fir_taps.hpp b/firmware/common/dsp_fir_taps.hpp
index 9602e4f73..37ea6307b 100644
--- a/firmware/common/dsp_fir_taps.hpp
+++ b/firmware/common/dsp_fir_taps.hpp
@@ -278,6 +278,37 @@ constexpr fir_taps_real<32> taps_11k0_channel{
     }},
 };
 
+// NBFM 12K5F3E emission type /////////////////////////////////////////////
+
+// IFIR image-reject filter: fs=3072000, pass=6250, stop=342250, decim=8, fout=384000
+constexpr fir_taps_real<24> taps_12k5_decim_0{
+    .low_frequency_normalized = -6250.0f / 3072000.0f,
+    .high_frequency_normalized = 6250.0f / 3072000.0f,
+    .transition_normalized = 336000.0f / 3072000.0f,
+    .taps = {{42, 108, 226, 412, 672, 1004, 1391, 1807, 2211, 2565, 2828, 2969,
+              2969, 2828, 2565, 2211, 1807, 1391, 1004, 672, 412, 226, 108, 42}},
+};
+
+// IFIR prototype filter: fs=384000, pass=6250, stop=42500, decim=8, fout=48000
+constexpr fir_taps_real<32> taps_12k5_decim_1{
+    .low_frequency_normalized = -6250.0f / 384000.0f,
+    .high_frequency_normalized = 6250.0f / 384000.0f,
+    .transition_normalized = 36250.0f / 384000.0f,
+    .taps = {{-38, -85, -162, -245, -315, -338, -275, -85, 255, 752, 1378, 2088,
+              2807, 3452, 3939, 4202, 4202, 3939, 3452, 2807, 2088, 1378, 752, 255,
+              -85, -275, -338, -315, -245, -162, -85, -38}},
+};
+
+// Channel filter: fs=48000, pass=6250, stop=9250, decim=1, fout=48000
+constexpr fir_taps_real<32> taps_12k5_channel{
+    .low_frequency_normalized = -6250.0f / 48000.0f,
+    .high_frequency_normalized = 6250.0f / 48000.0f,
+    .transition_normalized = 3000.0f / 48000.0f,
+    .taps = {{-75, -362, -712, -908, -592, 268, 1324, 1720, 684, -1522, -3541, -3385,
+              342, 7150, 14642, 19541, 19541, 14642, 7150, 342, -3385, -3541, -1522, 684,
+              1720, 1324, 268, -592, -908, -712, -362, -75}},
+};
+
 // NBFM 8K50F3E emission type /////////////////////////////////////////////
 
 // IFIR image-reject filter: fs=3072000, pass=4250, stop=340250, decim=8, fout=384000