Comparison of a fish signal with the playbacks of the same sound obtained using both the new device and a commercial underwater loudspeaker UW30.
Schematic diagram of a cross section of the device for underwater sound generation.
Device characterization: (a) Frequency response as a function of position; (b) frequency response as a function of distance.
Device characterization: (a) Comparison of spectra of painted goby sound (Pomasthoschistus pictus) and its playback with the device (both recorded with B&K 8103); (b) representation of power spectra of a fish sound (painted goby, Pomasthoschistus pictus) generated using the device, and attenuated in 6 dB steps (recorded using a B&K 8103 hydrophone). These results show that the dynamic range is greater than 36 dB. Notice that the playback amplitude was not increased further because, at the represented maximum, it was already above the amplitude generated by the fish.
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