Questions tagged [localisation]

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8 votes
1 answer
149 views

Difference between GCC 'flavours'?

I'm trying to use the generalised cross-correlation (GCC) to find time-difference esimates acoss my multi-channel data. I also understand that there are multiple types of GCC (PHAT, SCOT, Roth, Hanan-...
  • 3,958
6 votes
2 answers
77 views

Equipment recommendation for sound source localisation

Do you have any recommendation for multichannel equipment for source localization? What parameters should I consider for the microphones, for the recorder? Also any advice for starting multichannel ...
15 votes
3 answers
66 views

Locating birds by their calls with improvised equipment. Can algorithms rescue this setup?

In winter, I can usually hear one or two birds in an area, and I occasionally see them flitting through the air – but it's usually too dark to see them except in motion, silhouetted against the sky. ...
  • 383
13 votes
1 answer
39 views

Kit suggestion for programmable, weatherproof, speaker

Has anyone got recommendations for a battery powered metronome/speaker that could be used to emit a regular sound over a period of ~1 week and a radius of 100-200m outside, so that it could be used to ...
14 votes
2 answers
58 views

Minimum hydrophone spacing for low frequency bearing estimation

What minimum spacing is required to get good bearing estimations from a triangular hydrophone array for low frequency (20-200Hz) baleen whale calls?
11 votes
2 answers
51 views

Filtering audio for multichannel time-difference-of-arrival localisation

I have a multichannel array that I need to bandpass before feeding into my time-difference-of-arrival localisation (TDOA) routine. I remember hearing somewhere that I should be vary careful about ...
  • 3,958
10 votes
2 answers
44 views

Bumped into acoustic array during fieldwork - localisation issue?

While walking backwards in the dark, I bumped into my 4-channel inverted T-shaped acoustic array placed on a tripod. The array has a central mic with 3 peripheral mics at 60 cm Radius at 120 deg ...
  • 3,958
6 votes
1 answer
21 views

Automatic mic self-positioning routines?

I work with 4-22 mics on a regular basis in the field. A fixed array frame can't always be setup in the field site (a cave, and sometimes narrow spaces). I would like to have 'free-form' arrays whose ...
  • 3,958
5 votes
3 answers
31 views

Call reflections while recording bat calls with mic array

I have a 4 mic array on a tripod that I use to record Pipistrelles flying about 3-5 m above the ground over a lake. My calls are always 'double' for some reason (two calls, the direct path and some ...
  • 3,958
11 votes
2 answers
73 views

How do animals gauge the distance of a sound source?

I'm wondering if there are any common principles for how animals gauge the distance of a sound source. How to differentiate between a close, soft sound and a loud distant sound? For example, ...
11 votes
2 answers
64 views

How to interpret the localisation output in PAMGuard using squared array configuration in the 'Bearing Calculator' module?

I am struggling to interpret the output of the ‘Bearing Calculator’ module in PAMGuard using a squared array configuration. I think I understand the primary angle as being right or left (please, ...
11 votes
4 answers
76 views

what are the minimum number of micro/hydro-phones needed to perform 3d tracking?

I've heard from colleagues that you need at least 4 mics to get 3d coordinates from time-difference-of-arrival (TDOA) tracking. Then again, I also remember reading papers which use 3 microphones to ...
  • 3,958
5 votes
2 answers
51 views

How to compensate for atmospheric attenuation of a broadband sound?

I have bat call recordings from a microphone array, meaning i also know the 3d coordinates at which the calls were emitted. The 3d coordinates allows me to compensate for spherical spreading. I know ...
  • 3,958
6 votes
2 answers
80 views

Packages to acoustically localise animals with microphone arrays

I'm looking to localise vocalising (terrestrial) animals (in my case bat calls) based on time-difference-of-arrivals with an open-source package (preferably written in an open-source language too). ...
  • 3,958