Questions tagged [localisation]
The localisation tag has no usage guidance.
14
questions
9
votes
1
answer
272
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-...
- 4,070
6
votes
2
answers
108
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 ...
- 1,534
15
votes
3
answers
68
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
42
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 ...
- 131
14
votes
2
answers
95
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?
- 550
11
votes
2
answers
72
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 ...
- 4,070
10
votes
2
answers
50
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 ...
- 4,070
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 ...
- 4,070
5
votes
3
answers
39
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 ...
- 4,070
11
votes
2
answers
81
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, ...
- 461
11
votes
2
answers
101
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
92
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 ...
- 4,070
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 ...
- 4,070
6
votes
2
answers
93
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).
...
- 4,070