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[fix](trx-backend-soapysdr): tune wfm stereo separation trim

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Co-authored-by: Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
This commit is contained in:
Stan Grams
2026-02-28 21:39:35 +01:00
parent 73fe9d52ff
commit 862f0200bb
1 changed files with 6 additions and 4 deletions
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src/trx-server/trx-backend/trx-backend-soapysdr/src/demod.rs
+6 -4
View File
@@ -28,9 +28,9 @@ const STEREO_PILOT_NOTCH_Q: f32 = 12.0;
/// Narrow 19 kHz band-pass used to derive zero-crossings for switching stereo demod. /// Narrow 19 kHz band-pass used to derive zero-crossings for switching stereo demod.
const PILOT_BPF_Q: f32 = 20.0; const PILOT_BPF_Q: f32 = 20.0;
/// Fixed phase trim on the recovered L-R channel to compensate pilot-path delay. /// Fixed phase trim on the recovered L-R channel to compensate pilot-path delay.
const STEREO_SEPARATION_PHASE_TRIM: f32 = 0.0; const STEREO_SEPARATION_PHASE_TRIM: f32 = 0.012;
/// Fixed gain trim on the recovered L-R channel. /// Fixed gain trim on the recovered L-R channel.
const STEREO_SEPARATION_GAIN: f32 = 1.0; const STEREO_SEPARATION_GAIN: f32 = 1.006;
/// 4-point Hermite cubic interpolation. /// 4-point Hermite cubic interpolation.
/// ///
@@ -576,10 +576,12 @@ impl WfmStereoDecoder {
}; };
let left_corr = (sum_i + diff_denoised) * 0.5; let left_corr = (sum_i + diff_denoised) * 0.5;
let right_corr = (sum_i - diff_denoised) * 0.5; let right_corr = (sum_i - diff_denoised) * 0.5;
let left = self.dc_l let left = self
.dc_l
.process(self.pilot_notch_l.process(self.deemph_l.process(left_corr))) .process(self.pilot_notch_l.process(self.deemph_l.process(left_corr)))
.clamp(-1.0, 1.0); .clamp(-1.0, 1.0);
let right = self.dc_r let right = self
.dc_r
.process(self.pilot_notch_r.process(self.deemph_r.process(right_corr))) .process(self.pilot_notch_r.process(self.deemph_r.process(right_corr)))
.clamp(-1.0, 1.0); .clamp(-1.0, 1.0);
output.push(left); output.push(left);