Questions tagged [hardware]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
3 votes
1 answer
24 views

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
1 answer
32 views

What kind of cheap ultrasound speaker would you recommend for basic playback tests?

I'd like to test the sound response of some rodents to ultrasounds (~40-100 kHz), but my recording/playback devices (microphone, speaker, soundcard) are for human-hearing range. Regarding speakers, ...
Noil's user avatar
  • 4,121
3 votes
1 answer
38 views

Can I use music-related soundcards to record ultrasounds (providing the sampling frequency is high enough)?

I'd like to record rodent ultrasounds (~40-120 kHz) with a soundcard initially made to deal with human-related sounds. The sampling frequency can be adjusted accordingly, however, the microphone/line ...
Noil's user avatar
  • 4,121
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
2 answers
41 views

How do you prevent the circuit card from rattling inside a ST600/640 hydrophone recorder?

The long circuit board in the ST600/640 hydrophone recorders can rattle if the case moves rapidly, like on a struming cable.
Jay's user avatar
  • 241
3 votes
3 answers
110 views

Trouble reading ST600 data

We have a ST600 STD that was deployed for a period of 3months. We recently retrieved it and are unable to read the data from the device. When connected it just shows a red light. Internally and ...
IshaB's user avatar
  • 359
8 votes
1 answer
277 views

What options are there for micro audio recorders?

I'm in the process of purchasing gear for this upcoming field season and am looking for audio recorder recommendations. I'm hoping to place ~30 small recorders in seabird rock crevices to record ...
Katrina W's user avatar
  • 143
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
12 votes
3 answers
1k views

How is a non-integer sampling rate, that varies from file to file, possible?

I have been working with a new (to me) recording system called PMAR-XL. This system is available commercially as a passive acoustic package for the Seaglider. It was originally developed by the ...
selene's user avatar
  • 3,463
14 votes
1 answer
84 views

safety protocol for working with flooded housing with lithium batteries

As noted by others here, there have been occasions where recorder housings flood, and this can lead to damage to the lithium batteries. We are looking to develop safety protocol in case this happens ...
Shannon's user avatar
  • 3,605
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
19 votes
2 answers
151 views

SoundTrap calibration at high frequencies

SoundTraps, like all high frequency recorders, are highly unlikely to have a flat frequency response. Although there is some calibration information at 250 Hz from the manufacturer this will not ...
user avatar
18 votes
3 answers
656 views

Recommendations for external microphone for smartphone for casual recordings (birds, frogs, bats if possible?)

I would like to get a better microphone for my smartphone for recording wildlife around my home and when out camping. This question asked about very inexpensive accessories, but in this case, I am ...
selene's user avatar
  • 3,463
11 votes
2 answers
95 views

What is the AudioMoth absolute sensitivity in V/Pa?

How can I know the absolute sensitivity in V/Pa of AudioMoths (when used alone and also when used in the manufacturer's case) and its relation to the gain setting? A value measured at 1kHz or a full ...
Maxime BRU's user avatar
8 votes
3 answers
111 views

Problems with SoundTrap 500s

Has anyone else experienced issues with SoundTrap 500s? Two of mine stopped recording early. One had a battery issue, but the other issue went undiagnosed.
Kirby Parnell's user avatar
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
91 views

Are consumer grade USB audio interfaces 'safe' to use for bioacoustics recordings?

I've been seeing many relatively affordable USB audio interfaces (even multichannel ones, in fact) with >= 96 kHz sampling rates. These seem like a cost-effective alternative to some of the more ...
Thejasvi's user avatar
  • 4,070