Table 2.
Comparison of (a) HHT-based features extracted from HWV, SW click samples, and blue whale B call vocalizations; (b) HHT-based features extracted from HWV, SW click samples, and blue B call whale vocalizations.
| (a) | ||||
|---|---|---|---|---|
| Proposed Features Class I |
Proposed Features Class II |
Proposed Features Class III |
Lin et al. [9] Click I |
|
| Whale species | HWV | HWV | HWV | SW |
| Analysis sample duration | 17.2 ms | 17.2 ms | 17.2 ms | 10 ms |
| Number of IMFs |
6 | 6 | 6 | 7 |
| Important IMFs |
IMF1 (46.37%) | IMF1 (32.06%) IMF2 (29.22%) |
IMF1 (34.29%) IMF6 (15.80%) |
IMF1 (61.50%) IMF2 (12.41%) |
| Important RF |
34.21% | 22.64% | 38.33% | - |
| MS1 | 2980–3725 Hz (9.825%) 3725–4470 Hz (13.79%) |
745–1490 Hz (14.675%) |
2980–3725 Hz (12.064%) 3725–4470 Hz (6.885%) |
11–15 kHz (30.05%) |
| MS2 | - | 745–1490 Hz (18.990%) |
- | 4–5 kHz (1.20%) 6–7 kHz (1.04%) |
| MS3 | - | - | - | - |
| MS4 | - | - | - | - |
| MS6 | - | - | 52.15–59.60 Hz (10.237%) |
- |
| MS RF | 14.9–22.35 Hz (26.987%) |
14.9–22.35 Hz (21.633%) |
14.9–22.35 Hz (32.828%) |
- |
| Application | Features extraction | Features extraction | Features extraction | Features extraction |
| (b) | ||||
|
Lin et al. [9] Click II |
Wen et al. [10] Class I |
Wen et al. [10] Class II |
Adam [6] |
|
| Whale species | SW | BWBCV | BWBCV | KW |
| Analysis sample duration | 5 ms | 180 ms | 180 ms | 650 ms |
| Number of IMFs |
6 | 5 | 5 | 13 |
| Important IMFs |
IMF1 (73.33%) IMF2 (13.89%) |
IMF1 (83.40%) |
IMF1 (32.63%) IMF2 (37.00%) IMF3 (11.95%) IMF4 (12.07%) |
- |
| Important RF |
- | - | - | - |
| MS1 | - | 34–52 Hz (74.18%) |
41–52 Hz (24.08%) |
- |
| MS2 | 8–15 kHz (46.94%) |
- | 10–18 Hz (28.29%) |
- |
| MS3 | 3–7 kHz (10.08%) |
- | 4–7 Hz (10.38%) |
- |
| MS4 | - | - | 5–6 Hz (11.36%) |
- |
| MS6 | - | - | - | - |
| MS RF | 0–1 kHz (7.83%) |
- | - | - |
| Application | Features extraction |
Features extraction |
Features extraction |
Denoise and Features extraction |