Questions tagged [hydrophone]

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3 votes
1 answer
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Hydrophone calibration in a tank vs open water?

I’m looking to calibrate some hydrophones (specifically SoundTrap 300HFs, but perhaps this applies more broadly). I’m aiming to compare the SoundTrap hydrophone with a reference one, roughly following ...
TPW's user avatar
  • 33
1 vote
0 answers
27 views

How do I format EVO 256GB and 512 GB using the SoundTrap ST600 software?

When I put a new SD card in the soundtrap, the software gives me IO error i have try to format it according to the user's manual but when I insert this new card, the software doesn't react. This doesn'...
Mario Márquez Segovia's user avatar
2 votes
1 answer
29 views

Replace Hydrophones on ST500?

We have 2 x ST500s with hydrophone issues. One recorded static on a 4-month deployment (heartbreaking) and the other had a bite taken out of it (made for a good recording). I'm wondering whether it's ...
Natty's user avatar
  • 21
3 votes
2 answers
50 views

How do I format the EVO 256GB SD cards using the SoundTrap ST600 software (version 4 up)

First time user of the SoundTrap Host (version 4.0.13.25535) here. When I insert the EVO 256GB SD card using a card reader, there's no PC prompt warning (which means it is formatted to PC style I ...
SSR's user avatar
  • 31
3 votes
1 answer
66 views

SoundTrap 4300 CH1 Faint Signal & Banding

We have collected 2 channeled recordings from two different ST4300 units, and more recently we have noticed that the signal in CH1 looks really weak. This has occurred in most but not all new ...
Kourtney Burger's user avatar
3 votes
0 answers
42 views

Spectra Plus wav files not correct duration

I'm not sure if this is an issue with SpectraPlus or something else, but I heard others had similar problems with different software. I record with two hydrophones with a soundcard + monitoring it ...
Maya Philipp's user avatar
4 votes
2 answers
186 views

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 ...
Xavier Mouy's user avatar
3 votes
1 answer
45 views

How to Remove Hydrophone Alarm from the First 3 Seconds of Every Recording

I am currently doing soundscape analysis across three years. However, the data from one of the years has a hydrophone alarm while the other two years do not. As you can understand, this is a problem ...
Melanie Smith's user avatar
10 votes
10 answers
1k views

What affordable hydrophone options exist for in-the-field listening?

I am looking to purchase a hydrophone and speaker system that I can use to identify singing humpback whales while at sea, in order to deploy different tags to better understand song behavior on ...
Bark95's user avatar
  • 778
12 votes
2 answers
119 views

How long do hydrophone (/microphone) calibrations last for?

A colleague asked the room this the other day and nobody could confidently answer this... How long, after an acoustic sensor has been calibrated, is its calibration curve trustworthy for? There was ...
Chloe's user avatar
  • 3,685
9 votes
2 answers
97 views

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 ...
Jay's user avatar
  • 241
6 votes
1 answer
55 views

Recommendations for deep sea hydrophone calibration - US West Coast

I would like recommendations of where to get 7 deep-sea hydrophones fully calibrated. Units are SonoValuts (purchased new from Develogic) and the hydrophones are Neptune D/60. Recorders were ...
John Bleach's user avatar
5 votes
1 answer
43 views

Many time Hydrophone recording consist of Chain noise at regular interval. How to minimize this unintended sounds?

I was analyzing some marine data from the Red sea. I found some sound structures which didn't look like any biophony. When I listen to this sound, it looked like some chain noise. since I didn't have ...
Sougata Sadhukhan's user avatar
6 votes
1 answer
92 views

Low cost hydrophones for quantitative sound pressure measurements?

Has anyone experience with using low-cost hydrophones, for example the Acquarian Audio H2a, and use a calibration measurements, for example by comparing to a Brüel Kjaer 8106, to get quantitative ...
Jörg Rychen's user avatar
18 votes
6 answers
1k views

How to reduce the unwanted wave noise in Hydrophone recordings?

Many times hydrophone recording contains unwanted noise like 'wave noise'. How to deal with this noise at the source? Is there any way to deal with this in the analysis stage? as abrupt noise impacts ...
Sougata Sadhukhan's user avatar
14 votes
2 answers
99 views

Alternative approaches to minimize strumming in underwater recordings

Strumming is low frequency noise created by the vibration of a cable (see this question on how to identify strumming). According to The Practical Guide for Underwater Noise Measurement, strum can be ...
Shannon's user avatar
  • 3,605
15 votes
2 answers
163 views

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 ...
Shannon's user avatar
  • 3,605
11 votes
2 answers
52 views

ID guide for freshwater pond hydrophone sounds

What resources are available to help identify common sounds from freshwater pond hydrophone recordings? I can identify a number of distinct patterns which I imagine are probably characteristic of ...
bob drake's user avatar
  • 111
17 votes
5 answers
301 views

Calibrated vs. Non-calibrated Hydrophone Use

I am interested in collecting underwater acoustic data from a small boat and am finding the cost difference to be quite significant between calibrated and non-calibrated hydrophones. What are the ...
LizFerg's user avatar
  • 1,147
14 votes
6 answers
238 views

Towed Hydrophone Array Hardware Options

Periodically I am asked for recommendations on where to purchase a towed hydrophone array, or how to build one. For years we developed/built towed arrays and have shared these methods (last version ...
Shannon's user avatar
  • 3,605
13 votes
7 answers
242 views

ST600 hardware failures

We purchased some SoundTrap ST600s and have had an uncharacteristically high number of issues. Most recently, one flooded and another had a battery blow. We aren't sure whether the latter was caused ...
K.J. Palmer's user avatar
10 votes
2 answers
95 views

Comparing energy levels from two different hydrophones

I have two hydrophones to record the acoustic landscape of my study area. The two hydrophones have different sensitivities so I get different dB values for the same acoustic events. To get the energy ...
Anatoole's user avatar
  • 323