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The sound generated by vibrating air bubbles injected into water allows for passive detection of targets such as divers and gas leaking from underwater pipes. In this paper, the decaying sound generated by a single bubble is described, and this result is applied to a continuous train of identical bubbles generated by a single nozzle. The resulting acoustic pressure signal after a short transient time...
In this paper, the problem of underwater acoustic source localization using a single hydrophone is considered. The transmitted signal arrives at the hydrophone through the direct path and surface and bottom reflected paths. These multipath signals are used to define virtual hydrophones above the ocean surface and below the bottom for the purposes of source localization. An autocorrelation estimator...
Sperm whales (Physeter macrocephalus) emit a train of impulsive echolocation signals called “clicks” when diving in search of food. These acoustic signals can be divided into “usual clicks” and “creaks”. The frequency spectrum of these broadband transient signals is between about 500 Hz and 24 kHz, but most of the energy lies between 2 and 9 kHz. The usual clicks have an inter-click interval (ICI)...
Sperm whales (Physeter macrocephalus) can dive in search of food to a depth of over 1500 m and return to the surface within approximately 90 minutes. This makes conventional visual observation methods impractical to locate and track these animals. However it is possible to use an acoustic method for this purpose since a diving whale produces a series of loud impulsive acoustic signals or ‘clicks’...
The Department of Electrical and Computer Engineering at the University of Victoria offers degree programs in computer, electrical, and software engineering. Students in these programs are required to take a compulsory capstone design project course in their final year of studies. The objective of the design project is to have the students go through the exercise of integrating their knowledge acquired...
The compact representation of integers is an important consideration in areas such as data compression. In this paper a novel, simple, and effective approach for lossless compression of large-dynamic-range integer sequences is presented. It is shown that the proposed code is better than other codes for stepwise distributions. An optimization method for finding the optimal coding parameters is described...
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