VLF Natural Radio · Heidelberg

Live listening

Heidelberg, Germany
Very low frequency radio, analysed at 0.8–16 kHz
Lightning, whistlers, the magnetosphere
Computational interpretation

—
Signal state
—
Harmonicity
—
Spectral entropy
—
Novelty
—
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
—
Harmonics
—
Spectral centroid
—
Spectral flux
—
Entropy
—
RMS energy
—
Harmonicity
—
State
—
Known motifs
—
Dominant (1 h)
—

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.