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[fix](trx-backend-soapysdr): preserve more stereo under denoise

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Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
This commit is contained in:
Stan Grams
2026-03-01 19:06:15 +01:00
parent fb52558652
commit 623aad10d1
1 changed files with 8 additions and 3 deletions
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src/trx-server/trx-backend/trx-backend-soapysdr/src/demod/wfm.rs
+8 -3
View File
@@ -44,6 +44,8 @@ const DENOISE_BETA: f32 = 1.0;
const DENOISE_ALPHA: f32 = 0.5; const DENOISE_ALPHA: f32 = 0.5;
const DENOISE_FLOOR: f32 = 1e-10; const DENOISE_FLOOR: f32 = 1e-10;
const DENOISE_KNEE: f32 = 4.0; const DENOISE_KNEE: f32 = 4.0;
const DENOISE_STEREO_PRESERVE_MIN: f32 = 0.18;
const DENOISE_STEREO_PRESERVE_MAX: f32 = 0.42;
const STEREO_DIFF_DC_R: f32 = 0.9995; const STEREO_DIFF_DC_R: f32 = 0.9995;
const WFM_RESAMP_TAPS: usize = 32; const WFM_RESAMP_TAPS: usize = 32;
const WFM_RESAMP_PHASES: usize = 64; const WFM_RESAMP_PHASES: usize = 64;
@@ -651,7 +653,7 @@ impl WfmStereoDecoder {
let ring_pos = self.hist_pos; let ring_pos = self.hist_pos;
let sum_i = let sum_i =
polyphase_resample_ring(&self.sum_hist, ring_pos, &self.resample_bank, frac); polyphase_resample_ring(&self.sum_hist, ring_pos, &self.resample_bank, frac);
let diff_i = let diff_i_raw =
polyphase_resample_ring(&self.diff_hist, ring_pos, &self.resample_bank, frac); polyphase_resample_ring(&self.diff_hist, ring_pos, &self.resample_bank, frac);
let diff_q = let diff_q =
polyphase_resample_ring(&self.diff_q_hist, ring_pos, &self.resample_bank, frac); polyphase_resample_ring(&self.diff_q_hist, ring_pos, &self.resample_bank, frac);
@@ -665,8 +667,11 @@ impl WfmStereoDecoder {
self.stereo_separation_gain += self.stereo_separation_gain +=
0.015 * (separation_target - self.stereo_separation_gain); 0.015 * (separation_target - self.stereo_separation_gain);
let diff_i = let diff_i =
(diff_i * trim_cos + diff_q * trim_sin) * self.stereo_separation_gain; (diff_i_raw * trim_cos + diff_q * trim_sin) * self.stereo_separation_gain;
let diff_i = self.denoise.process(sum_i, diff_i, diff_q); let denoised_diff_i = self.denoise.process(sum_i, diff_i, diff_q);
let preserve = DENOISE_STEREO_PRESERVE_MIN
+ (DENOISE_STEREO_PRESERVE_MAX - DENOISE_STEREO_PRESERVE_MIN) * separation_drive;
let diff_i = denoised_diff_i + (diff_i - denoised_diff_i) * preserve;
if self.output_channels >= 2 && self.stereo_enabled { if self.output_channels >= 2 && self.stereo_enabled {
let diff = diff_i * blend_i; let diff = diff_i * blend_i;