Table 1.
Acoustic parameters (mean ± s.d.) of bio-duck (N = 6/n = 41 pulses) and downsweep (N = 26) sounds recorded on two acoustic recording tags. n(P), number of individual pulses; PF, peak frequency; CF, centre frequency; Q25, first quartile frequency (25%); Q75, third quartile frequency (75%); DUR90(P), 90% energy duration of individual pulses/downsweeps; RMS RL, RMS received level.
| n(P) | PF (Hz) | CF (Hz) | Q25 (Hz) | Q75 (Hz) | DUR90 (P) (s) | RMS RL (dB re 1 μPa) | |
|---|---|---|---|---|---|---|---|
| bio-duck | 7 ± 3 | 154 ± 13 | 155 ± 13 | 146 ± 12 | 165 ± 16 | 0.1 ± 0.0 | 140.2 ± 3.6 |
| downsweep | — | 83 ± 17 | 84 ± 17 | 75 ± 15 | 94 ± 15 | 0.2 ± 0.1 | 147.3 ± 5.3 |