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Acoustic index-based models for determining time of day in long duration environmental audio recordings
Citation
Watkins, J and Montgomery, J, Acoustic index-based models for determining time of day in long duration environmental audio recordings, Ecological Indicators, 117 Article 106524. ISSN 1470-160X (2020) [Refereed Article]
Copyright Statement
© 2020 Elsevier Ltd. All rights reserved.
DOI: doi:10.1016/j.ecolind.2020.106524
Abstract
Environmental sounds, such as bird calls, insects, animal and human activities, support monitoring the health of an area being listened to. Historically these observations needed to be made in the field, but in recent decades non-intrusive acoustic recorders can be deployed for long periods instead, reducing time spent in the field and increasing the volume of raw data collected. The volume of data that can be collected makes human-based processing impractical, so automated analysis approaches are required. Based on the observation that different times of the day exhibit characteristically different soundscapes, this paper investigates predictive (i.e., machine learning) models that use acoustic indices (a calculated representation of some aspect of the recording) to learn and later identify the gross time of day (dawn, day, evening or night). The analysis was based on recordings from north-west Tasmania, Australia, captured in Spring 2017, with 1-min segments of audio sampled at regular intervals across each day. No attempt was made to eliminate unwanted noise (such as wind and rain) before the audio was processed. While audio recordings will typically have accompanying time stamps, this study can be used as the basis for future work in environmental acoustics on: the preferred machine learning classifier; portability of models across sites; the quantity of data required for training; and feature selection.
Item Details
Item Type: | Refereed Article |
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Keywords: | soundscape, ecological acoustics, ecoacoustics, acoustic indices, machine learning, ecoacoustics, bioacoustics, biodiversity monitoring random forest |
Research Division: | Information and Computing Sciences |
Research Group: | Computer vision and multimedia computation |
Research Field: | Pattern recognition |
Objective Division: | Environmental Management |
Objective Group: | Terrestrial systems and management |
Objective Field: | Terrestrial biodiversity |
UTAS Author: | Watkins, J (Mr James Watkins) |
UTAS Author: | Montgomery, J (Dr James Montgomery) |
ID Code: | 139350 |
Year Published: | 2020 |
Deposited By: | Information and Communication Technology |
Deposited On: | 2020-06-11 |
Last Modified: | 2020-07-21 |
Downloads: | 0 |
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