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[fix](trx-rs): add EMA smoothing to signal strength and fix freq input clobbering

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EMA (α=0.4) smooths the carrier power estimate across DSP blocks. Custom PartialEq on VchanRdsEntry excludes signal_db so rapidly-changing levels do not trigger main state SSE updates that overwrite the frequency input.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
This commit is contained in:
Stan Grams
2026-03-27 15:24:18 +01:00
parent 5220e606c1
commit 6440f67d94
2 changed files with 15 additions and 3 deletions
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src/trx-server/trx-backend/trx-backend-soapysdr/src/dsp/channel.rs
+4 -2
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@@ -675,12 +675,14 @@ impl ChannelDsp {
// Carrier power: DC component of the mixed signal (narrow-band estimate
// at the tuned frequency). Correlates with the spectrum FFT peak.
// EMA smoothing (α ≈ 0.4) for fast response with light jitter reduction.
{
const SIGNAL_EMA_ALPHA: f32 = 0.4;
let inv_n = 1.0 / n as f32;
let dc_i: f32 = mixed_i.iter().sum::<f32>() * inv_n;
let dc_q: f32 = mixed_q.iter().sum::<f32>() * inv_n;
let carrier_power = dc_i * dc_i + dc_q * dc_q;
self.last_signal_db = 10.0 * carrier_power.max(1e-12).log10();
let carrier_db = 10.0 * (dc_i * dc_i + dc_q * dc_q).max(1e-12).log10();
self.last_signal_db += SIGNAL_EMA_ALPHA * (carrier_db - self.last_signal_db);
}
self.lpf_iq.filter_block_into(