3 ms·

Acoustic Location and Sound Mirrors (2004)

• djaychela 8y ago
  It's bizarre looking at the technology used, but I guess at the time mechanical technology seen here was the only way to do this at the right price (or possibly any price - I'd imagine that electronic performance simply wasn't good enough at the time in terms of noise floor and sensitivity?). Looking at most of these though, I wonder how many operators went deaf because of a loud sound being captured by them? I've been recording music professionally for the last 25 years, and seeing things like this makes me wince!
• sgt101 8y ago
  Using these to find aircraft was pretty marginal, but when applied to finding artillery or snipers sound location can be very effective and very accurate. It was used extensively in the later stages of WW1 to deliver counterfire.
• samcheng 8y ago
  The modern version of this utilizes an array or grid of microphones with synchronized clocks, and is quite effective in locating gunfire. The most famous manufacturer is "ShotSpotter." https://en.wikipedia.org/wiki/Gunfire_locator https://en.wikipedia.org/wiki/Gunfire_locator
  • jcims 8y ago
    ‘Acoustic camera’ seems to be the marketing term used for such products. Searching for this on YouTube will yield all manner of examples. The size of the device will dictate range and frequency response, there’s a neat study of elephants with one here: https://youtu.be/Xl7LnAob2T8 https://youtu.be/Xl7LnAob2T8 One thing that I think is interesting is that you could record a setting with one of these contraptions (eg party, train station) and go back later to do beamforming in software to zero in on specific conversations.