[HH] Mystery signal from a helicopter
Tom Metro
tmetro+hhacking at gmail.com
Sun Feb 2 02:11:13 EST 2014
A self-taught signals & electronics hacker from Helsinki spotted a
curious pattern in an audio recording of a helicopter and figured out
how to decode it...and what it meant.
Mystery signal from a helicopter
http://www.windytan.com/2014/02/mystery-signal-from-helicopter.html
Last night, YouTube suggested a video for me. It was a raw clip from a
news helicopter filming a police chase in Kansas City, Missouri. I
quickly noticed a weird interference in the audio, especially the left
channel, and thought it must be caused by the chopper's engine. I
turned up the volume and realized it's not interference at all, but a
mysterious digital signal! And off we went again.
-Tom
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