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2
votes
How do you know when minimum noise measurements are due to the instrument's noise floor or d...
voltage, input noise current, and gain
Edit: this gives self noise for whole acquisition chain. … What I typically do is not to measure the broadband noise voltage but the spectral density so may self noise estimates ate also relative to 1 Hz. …
1
vote
Are there any suggested tools for detecting and potentially removing specific sounds from a ...
What I typically do in such situations is to simply mask the timeseries after detecting the unwanted signal with NaN.
After that I would remove NaN from the data or use functions, where one can omitna …
8
votes
Relevant conferences for bioacoustics?
Some notes on DCLDE
It has its origin 2003 in Halifax, Can, to discuss techniques for Northern Right Whale protection, but moved on to more general passive acoustic monitoring.
While intended as work …
2
votes
Good definition for "noise"?
Apart from the old observation : "one man's noise is another man's signal" (see also https://english.stackexchange.com/questions/89577/origin-of-one-mans-noise-is-another-mans-signal ) the meaning/quality … not belong to the environment is described as noise …
8
votes
Accepted
I have electronic noise in my bird call recordings. How do I account for this noise while pe...
I assume that the noise lines are really clipped tonal.
one way of reconstructing the signal is to use an interpolating fft (fft length > window length) so that tonals are limited to a few frequency bins … If your signal is visible at lower and higher frequencies, then the noise, you could simply mask your interferences. this would correspond to a notch filter. you can also replace the interferences with …
4
votes
Accepted
How can I improve dynamic range for towed hydrophones?
when using towed arrays of hydrophones then I see various types of interfering noise
flow noise
tow cable strumming noise
surface noise
ship noise
flow noise can be removed by making the array hose larger … .
strumming noise is reduced by fairings (caveat: depending on type they can introduce high frequency noise)
surface noise can be reduced by towing the array as deep as possible: with 300 m tow cable and …
5
votes
How much do the sea-wave sounds interfere with acoustic communication in sea animals?
Surface noise is the dominant contribution for frequencies above, say 500 Hz to well over 100 kHz. … Only deep diving beaked whales echolocating at 40 kHz can reduce surface noise by 10 dB if they dive to 1000 m. …
5
votes
How to identify cable strumming in underwater recordings?
Edit: Taking Urick (1983) from the shelf one finds on Page 370 a better explanation:
This form of self-noise occurs in a current of water, and is the result of cable vibration induced by the eddies or … Strumming noise can be readily alleviated by a number of means, including using a faired cable, keeping the natural frequency of the cable vibration well separated from the strumming frequency, isolating …
3
votes
Should the sample rate be incorporated when calculating sound exposure levels?
It is correct that the sound exposure level (SEL) is an integral and it value is typically increasing with time. The classical approximation is
SEL=10*log10(sum(wav^2) * dt)
As
dt = 1/fs
you snipp …
11
votes
Accepted
How do I estimate the quantization error in recordings based on bit depth?
-138 dB (23 * 6 or 20*log10(2^15) = 138.5)
The bit numbers 15 or 23, instead of 16 and 24 are to exclude the sign bit from the estimation of the bit depth
when talking about bit depth and realistic noise …
2
votes
Thoughts on the acoustic masking impacts of a high amplitude sound that does not overlap in ...
For a rectangular window (FFT without windowing function) any off band noise > (signal +40 dB) will mask the signal of interest. … Now, concerning Noise Induced Hearing Loss (NIHL), I first quote https://www.nidcd.nih.gov/health/noise-induced-hearing-loss
which says
When you are exposed to loud noise over a long period of time, you …
7
votes
How to reduce the unwanted wave noise in Hydrophone recordings?
There are a couple of principles to enhance the signal to noise ratio
bandpass filtering removes out-of-band noise
median filters attenuate impulsive noise, when one is interested in tonals.
matched filter … Edit: As Rasmus indicates, better avoid generation of noise in the first place and design the system such that it does not generate so much noise. OK, it is not always easy. …
5
votes
Accepted
Recording parrots, would a Zoom H4N suffice?
Adjust gain such that signals of interest are not clipped, while background noise is still visible in spectrogram. …
1
vote
Can someone explain 195-224 dB re μPa at 1 m to me?
@MichaelLadegaard's answer is perfectly correct, so I try here a short version of it.
The Term "195-224 dB re 1 μPa at 1 m" (note I added a 1 before "μPa" (micro Pascal) to be more precise for underwa …
6
votes
Accepted
Distant impact on sea mammals of propagated sound wave of underwater nuclear tests
Edit:
You may look up Richardson Marina Mammals and Noise book for some ideas on impact of traditional explosions. …