Questions tagged [analysis]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
3 votes
0 answers
20 views

How to set frequency limits when using acoustic_complexity_index() from scikit-maad?

I have previously used R and the functions ACI() from seewave and acoustic_complexity() from soundecology to calculate the Acoustic Complexity Index (ACI). However, I am transitioning to using Python ...
GANH's user avatar
  • 31
1 vote
3 answers
98 views

BirdNET: workflow for correcting manually trained classifier?

I am using BirdNET GUI for analysis of bird vocalizations. I have created a classifier using the GUI and some training data, and I am wanting to improve it, e.g. correct false classifications and ...
Emma's user avatar
  • 11
3 votes
2 answers
64 views

Modeling PTS and TTS Distances for Pile Driving?

I was just wondering if anyone has any suggestions on how to find the auditory Permanent Threshold Shift (PTS) and Temporary Threshold Shift (TTS) ranges for Right whales. I know the source level for ...
Karianney's user avatar
4 votes
1 answer
96 views

Which software can batch calculate weighted SNR of recordings?

A way of assessing the quality of a sound recording in Audacity is to use 'ACX Check' found under Analyze to calculate an SNR value. 'ACX Check' is not intended for batch calculation of SNR for more ...
Ulf Elman's user avatar
  • 101
10 votes
1 answer
73 views

What statistical method should I use to see whether a birdsong changed in the span of ~20 years

For my current research, I am trying to analyze a birdsong located on two islands. For ~20 years, it was considered as one species but two years ago they were split and considered as two. I wanted to ...
ana-alcantara's user avatar
5 votes
1 answer
49 views

Advice on the best methods for quantifying high-medium SNR bird sounds

Related to my recent post, I am working on finding a way to 1) diagnose the presence of two kinds of specific bird sounds throughout my hundreds of hours of audio data, and perhaps to 2) analyze the ...
ksh530's user avatar
  • 171
8 votes
3 answers
186 views

Software for calculating long-duration false-colour spectrogram?

I'd like to calculate a set of false colour spectrograms, from long-duration audio -- i.e. the type of visualisation introduced by Michael Towsey's research group at QUT, like this: The QUT ...
Dan Stowell's user avatar
  • 1,924
5 votes
1 answer
46 views

Mark Recapture Distance Sampling, estimating trackline detection probability p(0) for additional variables such as Beaufort Sea States

Shipboard line-transect distance sampling methods are commonly used to estimate populations of cetaceans. One of the assumptions of these methods is that all animals on the trackline are detected, but ...
Melissa Costagliola-Ray's user avatar
12 votes
1 answer
183 views

Preferred R code settings/packages for publication-level spectrograms

I need to include spectrograms in a manuscript and was wondering what peoples' preferred R packages/code settings/etc. were for high-quality spectrogram plots? I know there are a bunch of options in ...
Carly Batist's user avatar
  • 3,370
9 votes
2 answers
84 views

Fuzzy clustering code for vocal repertoire analysis/classification?

I study a lemur species that has pretty graded calls, and it can be difficult to objectively draw the line between what is and is not a different call type. I've seen some recent work looking at fuzzy ...
Carly Batist's user avatar
  • 3,370
5 votes
1 answer
104 views

Uncalibrated results and non-recognition of timestamp with Meta function of PAMGuide in R

I need to calculate calibrated soundscape metrics for 2 months continuous recordings made with SoundTraps HF600, so I thougth about using PAMGuide (Merchant et al. 2015). I've tried using the Meta ...
LaraLopes's user avatar
9 votes
2 answers
135 views

How to measure long-term dataset for soundscape AND impulsivity?

I have years of passive acoustic monitoring data collected on several full-bandwidth underwater noise recorders around windfarms. Given the volume of the data, I need to automate the analysis, and am ...
Chloe's user avatar
  • 3,685
10 votes
1 answer
61 views

Echosounder setting off automated whistle detector in PAMGuard - Help!

I have underwater acoustic recordings and am interested in marking out dolphin whistles. I am currently having to manually remove an echosounder (which has a bit of a sweep to it), as I do not want my ...
Chloe's user avatar
  • 3,685
13 votes
2 answers
933 views

What is the purpose of overlapping windows in acoustic signal processing?

When reading the methods sections of bioacoustics papers, I often see a window length and % overlap reported in the description of how the spectral analysis was done. What is the purpose of this? ...
Chloe's user avatar
  • 3,685
14 votes
5 answers
743 views

What animals can be individually identified through their vocalisations? And to what extent?

Like humans, many animals have unique voices through which we can identify them individually. This information is beneficial in non-invasive tracking, population/density estimation and much more. But ...
Sougata Sadhukhan's user avatar
17 votes
3 answers
205 views

What soundscape visualizations are useful for assessing biodiversity over long time periods (>1 year)

I'm interested in effective methods to visualize and subsequently analyze long-term acoustic datasets, including those from disparate datasets. Are there preferred color schemes that work well for ...
Carrie Wall's user avatar
6 votes
1 answer
71 views

Fun challenge: how would you analyze this sound track to show presence or absence of acoustic interactions

How would you analyze the sound track in this video to show the presence or absence of acoustic interactions between the cello emissions and the birds? https://aeon.co/videos/yo-yo-ma-performs-a-work-...
sm1's user avatar
  • 601
10 votes
3 answers
142 views

How do I synthesise an arbitrary frequency-modulated sound?

I'd like to synthesise a series of bat social-call like sounds (that look 'wavy' on the spectrogram, (see schematic below). I'm looking to test my acoustic analyses with synthetic audio , and being ...
Thejasvi's user avatar
  • 4,070
8 votes
1 answer
209 views

Apple M1/M2 chips for acoustic deep learning

I’ve been reading that both Tensorflow and Pytorch deep learning frameworks are now supported by Apple M1/M2 chips. This means that a deep learning acoustic species classifier should run an order of ...
user avatar
19 votes
4 answers
1k views

$10\log_{10}(X)$ or $20\log_{10}(X)$ dB values - how to tell?

Inspired by this question on dBs, I wanted to ask about a potentially dumb confusion I always have. When referring to an absolute measurement value, dBs always come with a reference. However, it is ...
Thejasvi's user avatar
  • 4,070
6 votes
1 answer
170 views

How to change date/time created on Zoom H4N metadata

I've been using a Zoom H4N to record bird vocalisations paired with a dictation microphone for behaviour observations. When I'm trying to sync up my data, the dictation mic .mp3 file has the correct ...
Katrina W's user avatar
  • 143
10 votes
1 answer
61 views

How to assess the quality of audio signals?

Some questions already touch on this regarding signal-to-noise ratio (SNR). However, this is only one component of audio quality. Many other issues (such as clipping, signal degradation/mic quality) ...
cebola 's user avatar
  • 363
13 votes
3 answers
92 views

What lossy compression is okay for marine sound?

This answer by Dan Stowell states: Every time I've seen this studied, the MP3 compression makes little-to-no impact on the subsequent analysis. However, the papers I've read are mostly about ...
wizzwizz4's user avatar
  • 383
12 votes
2 answers
328 views

Click train classification - PAMGuard

I tried to find online resources on how the click train function of the click detector (the in-built click train detector), in PAMGuard, works. Unfortunately, I didn't find anything useful. I also ...
Cristina Marcolin's user avatar
19 votes
4 answers
133 views

How to interpret an echogram?

In several biologging studies that have used acoustic recording tags, I see graphs called "echograms" but I'm having trouble understanding them. For example, here is one made from a sound-...
Chloe's user avatar
  • 3,685
20 votes
4 answers
213 views

Software for calculating long-term spectral averages

What software programs exist that can be used to calculate sound levels for long-durations of continuous audio files? A helpful list of other sound processing programs was shared recently: https://...
Samara H's user avatar
  • 531
11 votes
2 answers
50 views

How to measure sperm whale's IPI?

It's pretty easy to find the definition of a sperm whale's IPI (interpulse interval) and the methods that can be used to do it. Papers usually show some spectrograms with different pulses (Møhl et al.,...
Cristina Marcolin's user avatar
24 votes
5 answers
314 views

Why report SNR, and what SNR is acceptable?

I see several papers that quantify animal sounds and include the SNR (signal-to-noise ratio) of the signals of interest. Why is this done - surely a signal wouldn't be detected if the SNR was ...
Chloe's user avatar
  • 3,685
17 votes
6 answers
97 views

Manual measurements of calls from spectrograms. Should I be concerned with accuracy?

I've been struggling to measure the duration of my field-recorded bat calls well (with decent amounts of reverberation). Manual measurements are common in my study field using spectrograms. Using a ...
Thejasvi's user avatar
  • 4,070
24 votes
12 answers
729 views

What is an easy way to split .wav files using R or Matlab?

I have some very long .wav files that are taking a long time to process. There are only short sections within this longer file that I'm interested in analysing. Is there an efficient way to split ...
EmmaL's user avatar
  • 737
5 votes
1 answer
50 views

What's the difference between types of frequency filters?

While trying to filter out low frequencies out of my recordings (in R, package Seewave and TuneR), I realized that there are many types of filters (butterworth filter, fir filter, square filter, etc.)....
lframond's user avatar
  • 1,024
15 votes
4 answers
131 views

Maximum wav file size for reasonable processing in PAMGuard

I would like to maximize the file size of my wav files for continuous recordings without significantly sacrificing the performance of PAMGuard analysis. I realize this depends computer specs (among ...
Shannon's user avatar
  • 3,605
5 votes
1 answer
29 views

Methods to segment CF and FM components of a call?

I have single-channel recordings of horseshoe/rhinolophid bats which have call shapes with a 'tabletop' or 'staple-pin' shape. (See spectrogram below). The flat portion is the 'constant-frequency' ...
Thejasvi's user avatar
  • 4,070
6 votes
6 answers
114 views

How to remove DC offset from my audio recordings in spectral domain?

I have audio recordings with a consistent DC offset, which I would like to correct. I know that in the time domain, I can subtract the mean of the entire signal from the original signal (...
Chloe's user avatar
  • 3,685