Signal Demodulation

Demodulate synchronized signals into WAV audio files (analog AM/FM) or byte/bit payload strings (digital PSK/QAM/GMSK/MSK) using native GNU Radio blocks.

nitrojacob 61ea29e 3 files · 8.7 KB Updated

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Signal Demodulation Skill 🎙️

Use this skill to extract the underlying payload content (audio or digital data) from a processed signal.

Instructions

  1. Execute Demodulation Tool:

    PYTHONPATH=/usr/lib/python3/dist-packages:./ .agents/skills/signal-demodulation/scripts/demodulate_signal.py --input <synced_or_cleaned_sigmf_file> --mod <FM|AM|QPSK|BPSK|GMSK|MSK> --audio_out <output_audio.wav>
    
  2. Native GNU Radio Blocks Employed:

    • Analog FM: analog.quadrature_demod_cf (Quadrature FM demodulation).
    • Analog AM: Envelope detector (blocks.complex_to_mag + filter.dc_blocker_ff).
    • Digital PSK/QAM: digital.constellation_decoder_cb & bit slicer.
    • Digital GMSK/MSK: digital.gmsk_demod & analog.quadrature_demod_cf.
  3. Inspect Content Preview: Review extracted audio WAV path or payload bit stream preview string in report.

nitrojacob/gr-playground/tree/main/.agents/skills/signal-demodulation commit 61ea29e3ab

Frequently asked questions

npx skillmds@latest add nitrojacob/signal-demodulation