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[perf](trx-backend-soapysdr): reduce wfm resampler taps from 64 to 32

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With Blackman-Harris window and proper cutoff (~0.24), 32 taps still
provides 60+ dB stopband rejection. Halves the per-sample MAC count
from 192 to 96 across the three resampler channels.

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
2026-03-01 09:41:26 +01:00
parent 380231a68f
commit 36d0e7e862
1 changed files with 1 additions and 1 deletions
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src/trx-server/trx-backend/trx-backend-soapysdr/src/demod.rs
+1 -1
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@@ -41,7 +41,7 @@ const STEREO_MATRIX_GAIN: f32 = 0.50;
/// and modulate higher-frequency stereo detail. /// and modulate higher-frequency stereo detail.
const STEREO_DIFF_DC_R: f32 = 0.9995; const STEREO_DIFF_DC_R: f32 = 0.9995;
/// Fractional-resampler FIR taps for WFM audio reconstruction. /// Fractional-resampler FIR taps for WFM audio reconstruction.
const WFM_RESAMP_TAPS: usize = 64; const WFM_RESAMP_TAPS: usize = 32;
/// Polyphase slots for the WFM fractional FIR resampler. /// Polyphase slots for the WFM fractional FIR resampler.
const WFM_RESAMP_PHASES: usize = 128; const WFM_RESAMP_PHASES: usize = 128;
fn build_wfm_resample_bank(cutoff: f32) -> [[f32; WFM_RESAMP_TAPS]; WFM_RESAMP_PHASES] { fn build_wfm_resample_bank(cutoff: f32) -> [[f32; WFM_RESAMP_TAPS]; WFM_RESAMP_PHASES] {