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The hidden background noise that can catch criminals

Tom ScottYouTube ↗

Further reading 1

If it is missing from the record, did it never happen? →A historian gets into the archive, but only for one period. A pilot witnesses an encounter, but the footage comes from a different flight. Follow the gap between an event and its surviving record.This video helps answer · How can mains hum align two timelines?

Caption notes

Forensic analysts compare variations in a recording’s mains hum with an independently recorded grid history. In one sample the fundamental is hard to see but its harmonic leaves a visible trace for comparison.

Archived captions (transcription method unspecified) ↗
Original passages · 2
record the grid frequency data
The hidden background noise that can catch criminals · ▶ 1:11–1:16
we'll be able to see the harmonic component around 100 hertz.
The hidden background noise that can catch criminals · ▶ 3:09–3:12

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