Audio Signal Scan
Input: /home/nsa/Descărcări/record001.wav
Output: /home/nsa/Desktop/signal-scan-record001-20260326-074140
Date: 2026-03-26T07:41:40+01:00

== ffprobe metadata ==
index=0
codec_name=pcm_s16le
codec_type=audio
sample_rate=7119
channels=1
channel_layout=unknown
format_name=wav
duration=232.967552
bit_rate=113905

== Artifacts ==
Metadata: /home/nsa/Desktop/signal-scan-record001-20260326-074140/metadata.txt
Signal profile: /home/nsa/Desktop/signal-scan-record001-20260326-074140/signal-profile.txt
Decode assessment: /home/nsa/Desktop/signal-scan-record001-20260326-074140/decode-assessment.txt
Summary JSON: /home/nsa/Desktop/signal-scan-record001-20260326-074140/summary.json
Burst ranges: /home/nsa/Desktop/signal-scan-record001-20260326-074140/burst-ranges.tsv
Analysis windows: /home/nsa/Desktop/signal-scan-record001-20260326-074140/analysis-windows.tsv
Spectrogram: /home/nsa/Desktop/signal-scan-record001-20260326-074140/spectrogram.png
Burst spectrogram dir: /home/nsa/Desktop/signal-scan-record001-20260326-074140/burst-spectrograms
Multimon results: /home/nsa/Desktop/signal-scan-record001-20260326-074140/multimon.txt
Morse results: /home/nsa/Desktop/signal-scan-record001-20260326-074140/morse.txt
Minimodem results dir: /home/nsa/Desktop/signal-scan-record001-20260326-074140/minimodem
Raw symbol trace: /home/nsa/Desktop/signal-scan-record001-20260326-074140/raw-symbol-trace.tsv
Raw state stream: /home/nsa/Desktop/signal-scan-record001-20260326-074140/raw-state-stream.txt

== Heuristic Signal Profile ==
Family: dual-tone / 2-FSK / AFSK-like narrowband data
Confidence: medium
Analysis sample rate: 48000 Hz
Duration: 232.968 s
Active windows: 1796 / 21837
Detected bursts: 1

- Top dominant tones: 1750 Hz (50.3%), 2250 Hz (49.7%)
- Median occupied bandwidth: 173.6 Hz
- Median spectral flatness: 0.0000
- Estimated tone pair: 1750 / 2250 Hz
- Estimated shift: 500 Hz
- Observed tone-change rate: 37.53 changes/s
- Run length percentiles: p10=0.011s, p25=0.021s, p50=0.021s, p75=0.021s, p90=0.043s
- Tone shift is in the range often seen in utility/telemetry-style 2-FSK rather than classic 170 Hz RTTY.

Likely active ranges:
- 0.0-228.9 s

Interpretation:
- This looks like data/tone signalling, not normal voice audio.
- Audio-only WebSDR captures are often not enough to identify the exact protocol.
- Known decoders failing can mean unsupported, proprietary, or protected traffic; audio alone cannot distinguish those reliably.
- Raw symbol/state exports were generated for the dominant tone pair.

== Decode Assessment ==
Status: structured_data_undecoded
Mode guess: dual-tone / 2-FSK / AFSK-like narrowband data
Interpretation: No supported lawful decoder matched. This may be unsupported, proprietary, or protected traffic.
Interpretation note: Audio-only analysis cannot reliably prove encryption.
Raw trace: /home/nsa/Desktop/signal-scan-record001-20260326-074140/raw-symbol-trace.tsv
Raw state stream: /home/nsa/Desktop/signal-scan-record001-20260326-074140/raw-state-stream.txt

== First-pass hits ==

[multimon-ng]
EEA: F88CCIR: C88
EEA: 8F88
CCIR: 8C888
EEA: F88F8
CCIR: C88C
EEA: FF8F
CCIR: CC8C8FF8FF8CC8CC[0xE8]
8
EEA: FF8
EEA: 88
CCIR: CC8
CCIR: 8[0xE8]
F8F8
EEA: 8FFC8C8
CCIR: 8CCFF88FFCC88CCF
EEA: 8
EEA: 8F8C
CCIR: 8
CCIR: 8C8
EEA: FFF8F

[minimodem 300]
.

[minimodem 1200]
.

[minimodem tdd]
_

[minimodem same]
.

[morse]
<....________......._____________><......._________________><.......___________________.><__..____________________________><......_____.___________....><.......__...............><ERR_23> <ERR_32> <ERR_17> <ERR_8> I<ERR_7>

== Consistency Notes ==
- multimon-ng selective-calling hits conflict with a measured dual-tone/2-FSK-like spectrum; treat them as likely false positives.
- No credible ASCII-like decode was produced by the generic minimodem passes.
- No credible Morse/CW text was produced by the dedicated Morse pass.
- Raw symbol/state exports were generated for manual analysis; these are not decrypted plaintext.

== Notes ==
- This script does not decrypt or break protected communications.
- If the recording is already plain demodulated audio, identification is more limited than with IQ/baseband recordings.
- For manual inspection, open the spectrogram PNG and also try inspectrum on the source file.
- Burst ranges and analysis windows were exported for downstream manual work.
- For ham digital audio modes such as PSK31, RTTY, Olivia or MFSK, try fldigi manually.
- False positives are possible. Treat this as triage, not proof.