sjg/trx-rs
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[fix](trx-backend-soapysdr): add headroom to wfm stereo matrix

Browse Source 
Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
This commit is contained in:
Stan Grams
2026-02-28 23:38:18 +01:00
parent 6d466f44d2
commit 0dd91a952b
1 changed files with 5 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/trx-server/trx-backend/trx-backend-soapysdr/src/demod.rs
+5 -2
View File
@@ -32,6 +32,9 @@ const PILOT_BPF_Q: f32 = 20.0;
const STEREO_SEPARATION_PHASE_TRIM: f32 = 0.012;
/// Fixed gain trim on the recovered L-R channel.
const STEREO_SEPARATION_GAIN: f32 = 1.006;
/// Extra headroom in the stereo matrix to reduce stereo-only clipping/IMD on
/// strong program material. This keeps bass excursions from flattening treble.
const STEREO_MATRIX_GAIN: f32 = 0.42;
/// Fractional-resampler FIR taps for WFM audio reconstruction.
const WFM_RESAMP_TAPS: usize = 6;
/// Polyphase slots for the WFM fractional FIR resampler.
@@ -603,8 +606,8 @@ impl WfmStereoDecoder {
// --- Deemphasis + DC block + output ---
if self.output_channels >= 2 && self.stereo_enabled {
let diff = diff_i * blend_i;
let left_corr = (sum_i + diff) * 0.5;
let right_corr = (sum_i - diff) * 0.5;
let left_corr = (sum_i + diff) * STEREO_MATRIX_GAIN;
let right_corr = (sum_i - diff) * STEREO_MATRIX_GAIN;
let left = self
.dc_l
.process(self.deemph_l.process(left_corr))