gbozo/no-sdr v2.6.4

v2.6.4 — RDS PS decode, state sync, audio drift correction

on GitHub

Fixes

RDS Station Name (PS) Now Decodes Correctly

The pilot-locked NCO mixer was using cos(3φ) but the RDS subcarrier is sin(3φ) per IEC 62106. The 90° phase error routed the entire BPSK signal into the discarded Q channel, producing zero PS output on the coherent path. Changed to sin(3φ) — station names now appear reliably.

Server/Client State Synchronization

• Server-side defaultBandwidthForMode() prevents over-wide IQ filtering on first tune and profile switch
• handleMode always applies bandwidth (explicit or mode default) — no more silent over-wide filter
• createClientPipeline uses stored client bandwidth if available
• SwitchProfile atomically updates ws.Client state, resets tune offset, and updates all pipelines
• Client resets tune offset on profile change, re-sends NB state on reconnect
• Reconnect sends mode+bandwidth atomically (eliminates race condition)

Audio Quality — Clock Drift Correction

• Continuous proportional controller replaces the dead-zone threshold that caused periodic micro-glitches every 10-30 seconds from silent drift accumulation
• Linear interpolation resampling for rate adjustment (was nearest-neighbor)
• Transferable ArrayBuffers for zero-copy postMessage to AudioWorklet (reduces GC pauses)
• 64-sample fade-in ramp on playback resume after underrun (eliminates pop)
• minBuffer increased to 200ms (3+ Opus frames of jitter tolerance)