Abstract
The effect of the underwater noise made by boats and ships on marine mammals is a current topic of research. The source of the noise is primarily the engine, and the intensity and spectrum of the noise are directly related to the rpm of the engine. For systems that monitor and record boat noise, it is useful to be able to estimate the rpm of the engine in order to correlate it with the noise characteristics. In this paper a processing method will be presented that automatically estimates engine rpm from the narrowband characteristics of the boat noise. This method was applied to recordings of a number of different boats in different environments. The accuracy of the results will be demonstrated by comparing the estimates with independent measurements of the engine rpm using instrumented test boats. General trends in broadband spectral intensity versus rpm will be shown for a wide variety of boats.
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