Multiband analysis for colored amplitude-modulated ship noise

Pascal Clark, Ivars Kirsteins, Les Atlas
2010 2010 IEEE International Conference on Acoustics, Speech and Signal Processing  
Propeller radiated cavitation noise is broadband yet audibly rhythmic, taking on the characteristics of amplitudemodulated noise. The study of this process is important because the shaft and blade rates, as well as other identifying features of the ship, can be inferred from the cavitation signal envelope. Unlike the conventional method for estimating the modulation frequency, this paper proposes a multirate subband method applicable to colored signals, and shows the conditions under which it
more » ... ns under which it is optimal in the sense of maximum likelihood. Application to actual ship noise data confirms the utility of the new method, yet also reveals previously unobserved signal dynamics, namely acoustic frequency-dependent phase shifts and amplitude variation in the modulation spectrum.
doi:10.1109/icassp.2010.5495776 dblp:conf/icassp/ClarkKA10 fatcat:2b5q4k2ch5cl7hnqui4aquydk4