AudioMoth-Utils

A Node.js library for performing various tasks involving AudioMoth and files created by the AudioMoth. The module is hosted on npm under the name 'audiomoth-utils'.

Usage

The module should be imported as normal:

var audiomothUtils = require('audiomoth-utils');

Expanding, Splitting, Downsampling, Aligning and Syncing

Expand an AudioMoth T.WAV recording (a recording with amplitude thresholding or frequency triggering applied):

audiomothUtils.expand(inputPath, outputPath, prefix, expansionType, maximumFileDuration, generateSilentFiles, alignToSecondTransitions, (progress) => {
    console.log(progress + '% completed');
}));

To be identified as an AudioMoth T.WAV file, a recording must fit the regex /^([0-9A-F]{16}_)?((\d{8}_)?\d{6})T\.WAV$/ and have the correct WAV header comment.

Note that all the functions in this library return an object with a boolean indicating success, and a string describing any errors that have occurred. For example, in the event that an input file could not be opened, the following object is returned.

{
    success: false,
    error: 'Could not open input file.'
}

---

Split an AudioMoth WAV file into a number of smaller files:

audiomothUtils.split(inputPath, outputPath, prefix, maximumFileDuration, (progress) => {
    console.log(progress + '% completed');
}));

To be identified as an AudioMoth WAV file, a recording must fit the regex /^([A-Za-z-_0-9]+_)?(\d{8}_\d{6})(_SYNC)?\.WAV$/ and have the correct WAV header comment.

---

Downsample an AudioMoth WAV file to a lower sample rate:

audiomothUtils.downsample(inputPath, outputPath, prefix, requestedSampleRate, (progress) => {
    console.log(progress + '% completed');
}));

To be identified as an AudioMoth WAV file, a recording must fit the regex /^([A-Za-z-_0-9]+_)?(\d{8}_\d{6})((_\d{3})|(_SYNC))?\.WAV$/.

---

Align an AudioMoth WAV file recorded with the standard firmware. First parse the associated GPS.TXT file:

audiomothUtils.aligner.initialise(inputPath);

Then align each individual WAV file.

audiomothUtils.aligner.align(inputPath, outputPath, prefix, onlyProcessFilesBetweenFixes, (progress) => {
    console.log(progress + '% completed');
}));

Finally, generate the summary GPS.CSV output file.

audiomothUtils.aligner.finalise(outputPath);

To be identified as an AudioMoth WAV file, a recording must fit the regex /^([0-9A-F]{16}_)?(\d{8}_\d{6})\.WAV$/ and have the correct WAV header comment.

---

Synchronise an AudioMoth WAV file recorded using the AudioMoth-GPS-Sync firmware:

audiomothUtils.sync(inputPath, outputPath, prefix, resampleRate, resolveWAV, resolveGPS, (progress) => {
    console.log(progress + '% completed');
}));

To be identified as an AudioMoth WAV file, a recording must fit the regex /^([0-9A-F]{16}_)?(\d{8}_\d{6})\.WAV$/ and have the correct WAV header comment. The function will check for, and load, the associated CSV file generated by the AudioMoth-GPS-Sync firmware.

Summarising AudioMoth Files

To summarise a folder of AudioMoth files first clear any previous summary:

audiomothUtils.summariser.initialise();

Then provide the path to the parent folder and each file:

audiomothUtils.summariser.summarise(folderPath, filePath, (progress) => {
    console.log(progress + '% completed');
}));

Finally, write the summary CSV file to a destination:

audiomothUtils.summariser.finalise(outputPath);

Example applications using this module

• AudioMoth Configuration App

License

Copyright 2017 Open Acoustic Devices.

MIT license.