Questions tagged [underwater]
The underwater tag has no usage guidance.
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What is the origin of this underwater low-frequency upsweep signal?
I've been trying to identify underwater sounds recorded in the eastern North Atlantic Ocean, at a 500 Hz sampling rate. I observed this low-frequency upsweep that was only produced once, but it shows ...
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Help! Really low values of underwater background noise, what happened?
I am working with underwater background noise/ambient noise in the eastern Atlantic Ocean using the package PAMGuide for R. My study has 32 sampling stations and it was conducted during 6 campaigns (...
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Detect 20 Hz Fin Whale Songs with PAMGuard
I want to use PAMGuard to detect 20 Hz fin whale vocalizations from audio files that I've created from low frequency (fs = 200 Hz) hydrophone data. I've figured out how to load the audio file and ...
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How does cetacean echolocation sound inside a submersible?
To be more specific: assuming an inner and outer hull, with the in-between gap partially serving as a ballast tank, would the transition from water to metal to air/water to metal to air:
a) amplify or ...
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Can I use MEMS microphones to record underwater sounds?
I am looking for a very cheap way to record sound underwater. I am mostly interested in recording low frequencies (i.e. ~ [10 - 5000] Hz). I have seen a few papers on MEMS technology to record sound ...
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What are these underwater, high frequency (20-45 kHz), upsweep signals?
In a recording from January 2023 in northern Norway (Skjervoy), I found a strange signal, that consist of upsweeps between 20-45 kHz (see spectrogram). We were recording humpback whales in the night ...
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Recommandation to design a fish tank for acoustic experiments
Hi Bioacoustic community,
We have been doing several experiments in fish tanks to identify fish sounds. However, the resonance degrades a lot the signal recorded with the hydrophone. The resonance ...
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Does anyone know of a compact, stereo underwater recorder (other than ST440/640)?
I'm looking for a commercial source of compact underwater recorder with inputs for at least two hydrophones. Ocean Instruments is not currently marketing their Soundtrap 440 or 640 recorders, so ...
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Are there any suggested tools for detecting and potentially removing specific sounds from a recording?
I have some underwater recordings (wav files) that have periods of relatively high self noise (something bumping the hydrophone). These have the potential of biasing the ambient sound measures I want ...
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Make simple broadband impulse underwater
I need to make a device (cheaply, so no piezo-based transducers) to generate an impulse underwater in shallow water (<30 m).
It need to do the following:
The impulse should be quite broadband (as ...
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How to identify cable strumming in underwater recordings?
Cable strumming (Section 4.3.2 in Practical Guide for Underwater Noise Measurement):
Cable strum occurs when cables are pulled taut by the action of
currents, and the cable is then caused to vibrate ...
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Can someone recommend hardware to generate ultrasound on underwater recording rig?
I would like to construct a simple system for automatic playback of ultrasound signals at low levels for calibration purposes on an underwater recording rig. Can anyone point to a suitable DAC (...
user18
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Filter or modify an in-air sound to make it sound how it would underwater?
I have recordings of a particular sound generated by a fishing vessel. Our team is trying to identify what exactly ON the fishing vessel is the source of that sound we as of yet only have underwater ...
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Bioacoustic studies [closed]
What would be the different possible paths to take to learn bioacoustic (especially underwater bioacoustic) ? What about the Master in Bioacoustic at the ENES Lab in Saint Etienne in France ?
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GAM() vs GEEGLM() for analyzing acoustic data in R
I've been working on a project where I'm using echolocation clicks recorded from a bottom-mounted, underwater passive acoustic recorder as a proxy for animal presence. I want to compare the presence ...
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