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[feat](trx-backend-soapysdr): implement IQ DSP pipeline (mixer/FIR/decimate/demod)

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Add dsp.rs with IqSource trait abstraction, MockIqSource, windowed-sinc
FIR low-pass filter, ChannelDsp (mixer/decimate/demod/frame-accumulator),
and SdrPipeline which spawns a dedicated IQ read thread. No soapysdr crate
dependency; the real device will be wired in SDR-07.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
This commit is contained in:
Stan Grams
2026-02-24 21:34:09 +01:00
parent db6dff304e
commit 5090ab71b3
3 changed files with 531 additions and 1 deletions
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@@ -26,7 +26,7 @@ This document specifies the requirements for a SoapySDR-based RX-only backend (`
|----|--------|------|---------|-------|
| 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 | `[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-06 | `[x]` | 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 |
### Server integration