There's a Persistent Hum in Windsor, Ontario, and No One Knows Why

Re:There's a Persistent Hum in Windsor, Ontario, and No One ... by XR0CSWV3h3kZWg on Tuesday February 20, 2018 @05:39PM (#16424936)

typical triangulation would depend on the sound being heterogeneous in waveform/volume right? If it's a constant hum then you'd only have volume dissipate as you move away which would get a lot harder as sound has different loss functions as it moves through different materials.

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Re:There's a Persistent Hum in Windsor, Ontario, and No One ... by LeifCarrotson on Tuesday February 20, 2018 @06:15PM (#16425208)

No, the triangulation you would use for a project like this would look for time delay or phase lag between 2 (or more) adjacent microphones.

The sound pressure wave is picked up by one, then some few microseconds later, it appears on the other(s) a few centimeters away.

This is pretty straightforward with ordinary sounds that dominate the signal. You could pick out the wire which was struck in a piano, and even the nodes and harmonics along its length.

It gets more difficult at lower frequencies and with quieter signals, which precisely describes this exact situation.

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Re:There's a Persistent Hum in Windsor, Ontario, and No One ... by Johnythree on Tuesday February 20, 2018 @09:56PM (#16426470)

You can't do this with a sine wave. It's impossible to exclude waves caused by reflections.

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