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[feat](trx-backend-soapysdr): implement demodulators (USB/LSB/AM/FM/CW)

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Add demod.rs with Demodulator enum and per-mode demodulate() implementations:
USB/Passthrough (real part), LSB (real part, IF negated upstream), AM
(envelope, DC removal, peak normalisation), FM/WFM (quadrature discriminator
scaled by 1/π), CW (magnitude envelope, peak normalised). Marks SDR-05 done.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
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Stan Grams
2026-02-24 21:29:27 +01:00
parent 04f8fd019a
commit db6dff304e
3 changed files with 165 additions and 1 deletions
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SDR.md
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@@ -25,7 +25,7 @@ This document specifies the requirements for a SoapySDR-based RX-only backend (`
| ID | Status | Task | Touches | Needs |
|----|--------|------|---------|-------|
| SDR-04 | `[x]` | Create crate scaffold: `Cargo.toml` (deps: `soapysdr`, `num-complex`, `tokio`), empty `lib.rs` | `src/trx-server/trx-backend/trx-backend-soapysdr/` | SDR-01, SDR-02 |
| SDR-05 | `[ ]` | Implement `demod.rs`: SSB (USB/LSB), AM envelope, FM quadrature, CW narrow BPF+envelope | `…/src/demod.rs` | SDR-04 |
| SDR-05 | `[x]` | Implement `demod.rs`: SSB (USB/LSB), AM envelope, FM quadrature, CW narrow BPF+envelope | `…/src/demod.rs` | SDR-04 |
| SDR-06 | `[ ]` | Implement `dsp.rs`: IQ broadcast loop (SoapySDR read thread → `broadcast::Sender<Vec<Complex<f32>>>`); per-channel mixer → FIR LPF → decimator → demod → frame accumulator → `broadcast::Sender<Vec<f32>>` | `…/src/dsp.rs` | SDR-04, SDR-05 |
| SDR-07 | `[ ]` | Implement `SoapySdrRig` in `lib.rs`: `RigCat` (RX methods + `not_supported` stubs for TX), `AudioSource`, gain control (manual/auto with fallback), primary channel freq/mode tracking | `…/src/lib.rs` | SDR-03, SDR-06 |