Acoustics / Feed

Acoustic monitoring is one of our biggest and most active groups, with members collecting, analysing, and interpreting acoustic data from across species, ecosystems, and applications, from animal vocalizations to sounds from our natural and built environment


Song Meter Micro experience?

Hi everyone, First off, what a great community this is! I only recently found out about it, and it seems like a game changer, especially for early career folk like me.I was...

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Hi Lucy, 

Sorry! I was in the field by the time you replied, and have not been back long. I realise it's been months now, but are you still planning on using the SM Micros? If so, please have a look at my thoughts in the new comment on this thread. I would think in Norway, the stridulating insect issue would not be as bad as in the tropics. Depends on what you want to use them for. Battery life is still definitely an issue though, and even more so in low temperatures. Good luck, let me know how you get on, or if you went with a different recorder.



Hi everyone. I am suuuuuper late on this discussion but I just finished 6-month fieldwork deploying 18 SM Micro over 70 different locations in Java, so I thought I would like to share my opinion on this device. So my work is basically installing each recorder in one location for the duration of 7-14 days before moving it to a different location, with battery and silica gel changed in between every deployment. Here's my thought:

Waterproofing - The first 2 months of the fieldwork was the wettest season I have ever experienced in the field. Extreme rain almost on a daily basis. Most of the time the recorder was working just fine except for the 2nd week of deployment when I found the inside a bit wet, but it was probably because I forgot to ensure that both lids were clicking.  The recorder still works fine after this deployment, and this was when I decided to change the silica gel before the next deployment.

Sound quality - As mentioned by others. there's an annoying peak at 6kHz. I did not originally plan to do soundscape analysis so it wasn't a big problem at the beginning, but now there is some discussion on doing so. Other than this I found the quality to be just adequate.

Battery Life - I am using alkaline 1,5 volt (non-rechargable) battery and get ~120 hours of recording, with a sample rate of 32khz. Suitable for my method, but certainly not for longer deployment.

Safety - My field site is full of a poacher who does not like to be detected, and the rangers warned me so many times about the camera trap that was destroyed or stolen by these people. I used steel cable and a small carabiner-style padlock which I later realized wouldn't stand a chance against a few hits of the machete, but luckily no recorder went missing--mostly because I tried to hide it as far as possible from the trails and cover our tracks. The small size of SM Micro makes it easy to hide among foliage (be careful on contact noise between leaves and recording), and the fact that it is colored green and has no external light also greatly helps (unlike Swiftone. Seriously, who thought that white is a perfect color for an expensive device that will be left in the forest for a long time?)

In conclusion, it is a cheap and easy-to-get device (compared to the mythical Audiomoth) for species presence detection in a short time like I did, but certainly not for longer deployment or more intricate bioacoustic analysis. 

Hi everyone, 

I wanted to provide an update on behalf of Wildlife Acoustics regarding some of these comments in this thread. As some of you may know, we have just announced the second generation of our Song Meter Micro. Along with 33% longer battery life due to an expanded battery tray (which now holds 4 AAs instead of 3), the Song Meter Micro 2 will also have a flatter frequency response. Though we don’t have a firm release date at the moment, we are currently looking at an early 2024 release, with pre-orders likely to start at the end of 2023. Detailed frequency response charts and specs will also be posted to our site soon. In fact, we have built an anechoic chamber in our new office and will be doing detailed testing with a host of new precision instruments. For more info on the Micro 2, check out our current product page. Lastly, thanks all for your open and honest feedback. It allows us to make our products better and better for you. 

Anechoic Chamber

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Conservation Innovation Manager

Island Conservation's Innovation Team is dedicated to developing innovative, data-driven tools to increase the scale, scope, and pace of island restorations around the world. As the Conservation Innovation Manager, you...

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Soil Ecoacoustics - viable?

Hi everyone, A colleague is keen to get a gauge on the potential of soil ecoacoustic tech. They are asking - it appears to be quite simple and practical tech, is it viable...

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Awesome, thanks a lot carlos! I've shared with the person who asked me. 

if you're up for it, I also may steal you for a variety hour spot on this at some point, as now i'm curious to hear more! 

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In case you missed it... (no. 1)

Five #tech4wildlife people, projects and updates that caught our attention this month. An AI supported bear early warning system, a project that's connecting indigenous communities with high speed internet, exploring...

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Hi Steph! Nice with this "sporadic series"! The bear alarm in China reminds me of the Bear Repeller by the Hack the Planet guys:/Lars
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Which market-available microphones, accelerometers and GIS sensors for dogs / pets ?

I have conducted an MSc thesis in data-science applied on bioacoustics data, and wish to carry on some experiments on my own now, using domestic environment as a lab.I am looking...

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Hi Luigi!


You should have a look at the μMoth

 developed by @alex_rogers and others from Open Acoustics Devices:

As an alternative audiologger meant to be animal borne, check out the Audiologger developed by Simon Chamaillé-Jammes @schamaille et al :

This one can also log acceleration and magnetometry! We have recently deployed it on muskoxen in Greenland.

For a GPS tracker, you may want take a look at the SnapperGPS by @JonasBchrt & @alex_rogers :

As an alternative the i-gotU GPS logger may be of interest:

Regarding your question on sampling frq: We have been using 8Hz (and 10 Hz on the Audiologger Acceleration logging) for our slow moving muskoxen. For an animal like a dog, you probably want to sample at somewhat higher frq. This group used 50Hz in a study of arctic fox: 



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Audiomoth online conference

For the second time, you can join an online conference dedicated to the little green bioacoustics device known as Audiomoth.

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Hello! Is it possible to get a recording of this conference? I am working on a conservation project using Audiomoth and I think the material covered in this conference will be...
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Large scale bioacoustic analysis in the Peruvian Amazon

It's relatively easy to collect vast amounts of audio data - it's not so easy to analyse it and get consistent results. The Wilder Sensing platform enables users to upload vast quantities of audio which is then analysed using ML models such as BirdNET - read Auroras story.


Estimating California Spotted Owl population with bioacoustic survey

News about a population survey of California Spotted Owls using 1,600 autonomous recording units in the Sierra Nevada region. Machine learning made analyzing this acoustic data possible at this large scale for the first time.


Reviewing Now: Animal Telemetry Postdoctoral Fellowship

Smithsonian Environmental Research Center
The Smithsonian Institution seeks a field- and data-oriented biologist to support marine animal telemetry research and to assist with activities of the Atlantic Cooperative Telemetry (ACT) Network. 

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Building a new recording device for sound localization

Hi all, Nice group! I'm building an acoustic monitoring device that I wanted to share as it may be of interest to some people and also I'd like to know of any requirements that...

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Thanks! Yes, I'm using the libraries from opensoundscape and it was Tessa who pointed me to wildlabs :) I'll publish the source code to the sound capture code this weekend in github with minimal instructions on configuring the rest of the OS till I get time to write an article about it which won't be till I've built 5x articles and done a convincing field test for a motivating article. Note, although I learnt how to configure the time synchronization with PPS from other articles on the net some steps were missed out that were vital to getting a fast and good sync, I'll be publishing these. Specifically, the start order of the gps versus chrony needs to be reversed from the default otherwise the PPS signal is not being communicated via shared memory to chrony which ruins the convergence to accurate time. Along with allowing the chrony time server daemon to step the clock so long as the alignment has > 1 ms of difference.

Simulations with opensoundscape suggest really, really good accuracy with the soundfinder algorithm is possible. When we get closer to new years eve I'll get really good test data from all the illegal fireworks that get set off here.

Once the capture side of things is sorted I'll move on to finding a good inference algorithm that performs well on the raspberry pi and then to working on a central server to correlate all of this automatically with the goal to making something that sends out an alert to a google maps link as to the location of the source, that will be fun :)

Oh and actually, I have to finish the install code for my other project that links computer vision algorithms to a state management and alerting system. This runs on jetson series SBCs. I've ported it all to the new Jetson Orin series computers but haven't yet finished writing the install code because I got distracted with this project about 4 months ago. The computer vision alerting state machine thing is here, and it's also useful in the fight against poachers. The new Orin series from nvidia allow the highest scoring open source computer vision algorithms (based on the microsoft coco dataset) to be integrated, such as yolov6, which results in significantly less false positives. And the state management facilities of my app provide you with a large amount of flexibility to reduce this even further.

As promised, I've pushed the code to github today, the URL is:


Note, this is somewhat of a premature announcement (to keep my promise) because I still need to add a bunch of documentation and how to install the prerequisites, recommended way of deploying etc.

However, for the curious, it is a very simple program. And so long as you install jackd2 and the prerequisites to the build script (./ it will run on whatever system you have and accurately align the sound files to the system time, along with the tracking file.

Much of the work surrounding this project was working out how to setup the GPS synced system time correctly. There are several guides on how to do this, however, when I tried to run this on a system that was disconnected from the network I found that there were important steps omitted in the guides that were needed to provide fast and accurate syncing in the absence of any network. I'll be adding these steps to this repository over time and write up a nice article about it once I've done the field tests. With the changes I made when installing the time sync changes the current system will sync to sub microsecond accuracy within a minute from when 5 satellites are locked.

I've tested a Petterson ultrasonic microphone with a sample rate of 384khz and it works out of the box with this software as well. Would be cool to sound localize some bats.

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Hydromoth settings

Hi Everyone,what is your #HydroMoth setup for freshwater ecoacoustic monitoring? What are your settings for underwater recording with your AudioMoth? I would love to dicuss...

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Hi Ian, are you in Brisbane? We're based in Brisbane also. You can borrow a few BARLT and Aquarian Audio hydrophones for a little while to compare against your hydromoth. We have localisation also using the inbuilt GPS and software to time align the calls. It'll probably save you time. You can run a microphone and hydrophone on a cable on the one recorder.

Hi Ian,

I have hours of an unidentified creature recorded during overnight recording sessions with mutliple hydrophones. We think it is platypus but there is nothing to compare against that isn't from captive sounds. I am waiting on the Hydromoth to become available again so I can do longer term monitoring.

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Acoustic Monitoring and AI to Recognize Elephant Sounds & Gunshots

This article discusses Cornell's bioacoustics work with AI tools to recognize both elephant "voices" as well as gunshots. The elephant rumbles analyzed in this work are almost imperceptible to the human ear, but can be clearly detected with technology.


#Tech4Wildlife Photo Challenge: Judges' Panel Honorees

Please join us in celebrating this year’s top #Tech4Wildlife Photo Challenge Honorees as chosen by our panel of leading conservation organization judges, and enjoy the story contained within these entries about how our...

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Detection and removing of windy events in wild acoustic recordings

Hello to everyone, I have to clean my dataset of recordings concerning an African penguin colony inhabits the South African coast. In particular, since I have recordings with days...

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Interesting subject! 

I work on the tundra in Northeast Greenland and we get some quite high winds.

I am right now testing wrapping our AudioMoths with a simple windjammer. It will not work in the strongest winds, but in many cases it will reduce clipping.

I am using the Røde Dead Kitten which seem to fit perfectly! Only issue is that the last batch I got had a much tighter elastic band (perhaps something went wrong in production or they changed it).



Hi everyone! 

@baddiwad was one of our fantastic speakers in our June Variety Hour show, so we had the chance to hear about her work in a lot more detail. If you're interested in finding out more about Franscesca's project, catch up here: 

Audacity has a noise filter which one 'trains' on a piece of recorded noise. Perhaps it is worth a shot. Freeware, open source, and with a community of developers and users.

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Does anyone have experience of LABMaker?Has it been good? Bad? Any comments or feedback? We are looking for groups who could help us to manufacture a piece of open hardware. Also...

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Dear Tom, the AudioMoths are being sold via LabMakers (but I do not know if they construct them for them). Have you been in touch with the AudioMoth team?  I am sure they will be able to provide you useful feedback regarding what you are trying to do, and LabMakers.

I have only used them to buy things from them.

Regards, Christos

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