Questions tagged [noise]

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Thoughts on the acoustic masking impacts of a high amplitude sound that does not overlap in frequency with a signal of interest?

I have a relatively specific thought on acoustic masking, and wanted to know what others think, or if folks know of studies that have addressed this problem. When studying acoustic masking, we often ...
William Halliday's user avatar
3 votes
4 answers
116 views

Good definition for "noise"?

Does anybody have a good definition for "noise" that includes all aspects of it? I vaguely remembered something like : "noise is a signal that does not contain any relevant information ...
lframond's user avatar
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4 votes
2 answers
114 views

Detection and removing of windy events in wild acoustic recordings

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 of strong wind with clipped/noisy ...
fterranova's user avatar
6 votes
1 answer
70 views

Recording parrots, would a Zoom H4N suffice?

I am working on my undergrad thesis with geographical variations on parrot vocalizations.I originally designed my study with Audiomoths because I had just gotten some. However, I now realized that ...
user1396's user avatar
8 votes
2 answers
182 views

Could I use the click train identification detector of pamguard when I only have one channel (one hydrophone)?

I have tried to detect click trains of dolphins in my audio file using the click train identification, but it doesn't detect any click trains. (The recording contains clicks of the species Tursiops ...
Anaa's user avatar
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11 votes
3 answers
198 views

Should the sample rate be incorporated when calculating sound exposure levels?

A sound exposure level is defined as the integral of squared pressures, over a defined time-period and frequency range, and it is reported with units of dB re: 1 µPa$^2$s (for water-borne acoustics). ...
ASimonis's user avatar
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9 votes
2 answers
98 views

How do I estimate the quantization error in recordings based on bit depth?

I've found myself looking this up about once every few years so thought this would be a good place to pose the question for others (to look up every few years). When considering the precision of ...
K.J. Palmer's user avatar
9 votes
2 answers
91 views

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 ...
ducks's user avatar
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6 votes
2 answers
79 views

Recording of whitefly vibrations: "piezo" versus "low-noise microphone with subtrate-air diffusion"

Whiteflies communicate before and during mating through abdomen oscillations which vibrations are believed to propagate mostly in the leaf (~100-400 Hz). They are very low-energy signals which are ...
Noil's user avatar
  • 4,121
10 votes
2 answers
725 views

How much does inner city noise mask bat echolocation?

When traveling in a very busy,very loud city recently, I noticed a few small bats clearly feeding on bugs attracted to a street lamp. I was on a party street, and there was loud music pouring out of ...
etgriffiths's user avatar
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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
9 votes
3 answers
64 views

Recommended wind screen for MEMS microphones

Some folks in my lab are using Wildlife Acoustics Song Meter Mini sensors in a very windy grassland environment and having recordings get messed up by wind noise. Has anybody here had good luck with ...
dtsavage's user avatar
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26 votes
12 answers
499 views

Relevant conferences for bioacoustics?

Last week I was at a conference in Berlin entitled "Effects of Noise on Aquatic Life". I was wondering, what other conferences are relevant to the bioacoustics community. I have listed a few ...
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
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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
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11 votes
1 answer
56 views

What kind of light do you use in the lab to avoid any sound noise?

It can be tricky to have a perfect silence in an experimental space, even if soundproofed. But it is required especially when low sound-level communications are studied such as with arthropods. One ...
Noil's user avatar
  • 4,121
13 votes
2 answers
64 views

Distant impact on sea mammals of propagated sound wave of underwater nuclear tests

Nuclear tests have obvious effects on life and habitats by physical destructions and irridiations. This has been widespread between the 50s and 80s, mostly from the USA (1054 tests incl. 835 ...
Noil's user avatar
  • 4,121
15 votes
2 answers
101 views

How much do the sea-wave sounds interfere with acoustic communication in sea animals?

During storm / bad weather, sea waves produce powerful acoustic energy. In sea animals which use sounds to communicate, is there any studies about how they cope with this? As any species in a given ...
Noil's user avatar
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18 votes
3 answers
76 views

What soundscape metrics best capture shipping noise?

Some studies, like Haver et al 2019 use broadband measurements between 50 Hz - 1.5 kHz, but Haver et al 2020 looked for shipping noise in median power spectral densities between 10 Hz - 2 kHz, and ...
ASimonis's user avatar
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10 votes
3 answers
52 views

How to incorporate audiogram functions into weighted sound exposure levels based on different hearing groups?

Not all marine mammals have the same hearing abilities, therefore National Marine Fisheries (2020) recommends using audiogram-weighting for sound exposure levels (SELs) based on different marine ...
ASimonis's user avatar
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8 votes
2 answers
49 views

Where can I find the official "limits" on what noise levels cause harm in marine mammals in US waters?

The effects of noise on marine life is a huge area of study (it even has its own conference!) but I find I'm very overwhelmed when trying to explain to a non-biologist or non-acoustician what those ...
selene's user avatar
  • 3,463
9 votes
2 answers
43 views

What sound level metric to use when relating ambient noise level to animals?

I'm trying to measure elevation in ambient noise levels due to boat activity and relate this to bottlenose dolphins and how it may effect them. Mammals integrate sounds over one-third octave bands (...
EmmaL's user avatar
  • 737
10 votes
3 answers
117 views

How can I improve dynamic range for towed hydrophones?

Dynamic range is the ratio of the strongest, or loudest part to the weakest, or softest and is measured in dB (as explained in Ch 11 of Applied Underwater Acoustics). This site offers a musician's ...
Shannon's user avatar
  • 3,605
15 votes
2 answers
91 views

I have electronic noise in my bird call recordings. How do I account for this noise while performing measurements?

My recordings of bird calls have multi-harmonic noise (probably generated by some electronic device e.g. as mentioned here). I would like to perform peak-frequency and other such spectral measurements....
Thejasvi's user avatar
  • 4,070
13 votes
3 answers
85 views

How do you know when minimum noise measurements are due to the instrument's noise floor or due to the environment?

I have some ambient noise recordings and am uncertain if the lower SPLs represent true low noise levels in the environment, or are perhaps due to the noise floor of the instrument itself. I have ...
Chloe's user avatar
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