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11 questions
3
votes
1
answer
17
views
Estimating the quality of harmonic vocalizations (Penguin)
I'm struggling to find a reliable method to estimate the quality of harmonic vocalizations in African penguins, specifically I'm interested in the 'b' syllable: the longest syllables in their Ecstatic ...
- 81
2
votes
1
answer
86
views
Propagation modelling: Convolving Bellhop Arrival Times and Amplitudes to Estimate TL
Hey brilliant friends and colleges,
I'm reaching out with regard to a signal processing problem. The short and the long of it is I'm replicating some of the processes used in Kusel et al. 2016.
There ...
- 821
2
votes
1
answer
41
views
Decimating data in MATLAB vs Triton - question about 'native' and data types
The MATLAB-based program Triton has tool to decimate data for analysis. We typically decimate the full frequency data (150 kHz+) down to 1 and/or 10 kHz to have better resolution to look for low-...
- 3,707
2
votes
1
answer
91
views
How does Raven paging deal with imperfectly continuous data?
I have sound files from a recorder that writes very near continously, but with very tiny 0.0192 s gaps between every 1-minute file. A single 60-sec file with a sample rate of 180 kHz should be ...
- 3,707
9
votes
3
answers
563
views
How and why do we rescale the input and/or output of an FFT for bioacoustics research?
I am plotting power spectra of echolocation clicks in R and I want to calculate the absolute magnitudes of the power spectra (not normalized dB values relative to the max). My understanding is that ...
- 91
10
votes
3
answers
288
views
Should the sample rate be incorporated when calculating sound exposure levels?
A sound exposure level is defined as the integral of squared pressures, over a defined time-period and frequency range, and it is reported with units of dB re: 1 μPa$^2$s (for water-borne acoustics). ...
- 1,888
8
votes
1
answer
400
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-...
- 4,050
7
votes
1
answer
94
views
Data augmentation in bioacoustics: pros and cons?
Even though we already have a discussion regarding what kind of data augmentation makes sense for ML in bioacoustics (Data augmentation strategies for bioacoustics machine learning), i believe it ...
- 435
13
votes
2
answers
4k
views
Should we normalize audio before training a ML model
In computer vision it seems that image normalization is very important to keep the gradients "in check" (detailed description here). However, I was wondering if it was also the case in audio ...
- 897
10
votes
1
answer
113
views
How do you amplify all sounds in a directory in R?
I am preparing short sound clips to upload to a citizen science data analysis project, and realize that the sound levels are all too low for users to hear properly. I'm familiar with the tuneR and ...
- 1,888
5
votes
2
answers
94
views
Measuring Energy Flux Density (EFD) - how is the length of a click determined?
When measuring echolocation clicks, there are multiple ways to make some measures of amplitude, for example peak-to-peak, RMS or energy flux density (EFD). Peak-to-peak and RMS are simple, however, I ...
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