Questions tagged [db]

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2 votes
1 answer
80 views

Is it possible to calculate the SPL of a sound from a wav audio file?

I recorded a frog's call at a distance of 1 m, with a Tascam DR40x recorder and its internal microphone. I want to know if there is a way to calculate what is the SPL in dB of that call or/and the ...
Carlos A. Flores's user avatar
3 votes
1 answer
41 views

How to adjust seewave spectro to account for hydrophone sensitivity?

I am using seewave's spectro() to generate a spectrogram from a hydrophone recording. My call is: ...
Tom Quigley's user avatar
5 votes
2 answers
136 views

How to convert relative db to db SPL knowing microphone specifications?

Similarly to this discussion (Is it common to have a negative-positive dB range in underwater spectrograms?), I used the 'seewave' R package to plot the below spectrograms. I limited the coloured ...
Andrea's user avatar
  • 53
19 votes
4 answers
1k views

$10\log_{10}(X)$ or $20\log_{10}(X)$ dB values - how to tell?

Inspired by this question on dBs, I wanted to ask about a potentially dumb confusion I always have. When referring to an absolute measurement value, dBs always come with a reference. However, it is ...
Thejasvi's user avatar
  • 4,070
22 votes
5 answers
659 views

"dB [re 1 µPa]" notation - why sometimes with a reference, and sometimes without?

I've come across several different formats for reporting acoustic measurements. One that has particularly confused me is when someone reports the source level of something as, for example, "120 ...
Chloe's user avatar
  • 3,685
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
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