Fig. 2 | Scientific Reports

Fig. 2

From: A hybrid method combining rule-based filter and machine learning to detect porpoise and vessel sounds from a pulse event recorder

Fig. 2

Examples of (a) finless porpoise click trains and (b) vessel noise recorded by the A-tag. The x-axis shows the recording time. The y-axes show the received sound pressure level (relative to Pa) at hydrophone A (SPL), the sound pressure level ratio between hydrophones A and B (SPL ratio A/B), the time difference (µs) between hydrophones A and B that can be converted to relative azimuth, and the pulse interval (ms). A positive value for the time difference indicates that the signal arrived at hydrophone A earlier than at hydrophone B.

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