VLF Natural Radio · Cumiana

Live listening

Cumiana, Italy (near Turin)
Very low frequency radio, analysed at 0.8–16 kHz
Lightning, whistlers, the magnetosphere
Computational interpretation

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Signal state
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Harmonicity
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Spectral entropy
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Novelty
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connecting
Interpretation
  1. Listening… the first interpretation appears within about a minute and a half.

Memory marks = remembered motifs by frequency · taller = more often · brighter = more recent · band = texture · needle = dominant now · point at a mark for details

Spectrogram

Frequency spectrum

Harmonic map coloured by motif

Detected features

Dominant frequency
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Harmonics
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Spectral centroid
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Spectral flux
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Entropy
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RMS energy
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Harmonicity
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State
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Known motifs
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Dominant (1 h)
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Recent events

  1. Listening…

Filters applied

Known interference at these frequencies never becomes a resonance or a motif, is not read as the dominant frequency and gets no peak in the frequency spectrum.

The sound and the spectrogram are unfiltered.