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Duncan Tamsett
A human listening to monophonic sound through headphones perceives the sound to emanate from a point inside the head at the auditory centre at effectively zero range. The extent to which this is predicted by synthetic-aperture calculation performed in re...
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Duncan Tamsett
Wallach (J. Exp. Psychol. 1940, 27, 339?368) predicted that a human subject rotating about a vertical axis through the auditory centre, having an acoustic source rotating around the same axis at twice the rotation rate of the human subject, would perceiv...
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Duncan Tamsett, Jason McIlvenny, James Baxter, Paulo Gois and Benjamin Williamson
A prototype three-frequency (114, 256, and 410 kHz) colour sidescan sonar system, built by Kongsberg Underwater Mapping Ltd. (Great Yarmouth, UK), was previously described, and preliminary results presented, in Tamsett, McIlvenny, and Watts. The prototyp...
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Duncan Tamsett
Sound backscattered to a sonar from a seabed decreases in intensity with increasing range (R" role="presentation" style="position: relative;">??R
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) due to geometrical spreading. As a far-range approximation, a geometrical spreading correction of +30&am...
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Jason McIlvenny, Duncan Tamsett, Philip Gillibrand and Lonneke Goddijn-Murphy
Sediment banks within a fast-flowing tidal channel, the Inner Sound in the Pentland Firth, were mapped using multi-frequency side-scan sonar. This novel technique provides a new tool for seabed sediment and benthic habitat mapping. The sonar data are sup...
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Duncan Tamsett, Jason McIlvenny and Andrew Watts
The backscatter response of a seabed to an incident sonar signal is dependent on the carrier wave frequency: i.e., the seabed is acoustically colourful. Colour is implemented in a prototype three-frequency sidescan sonar system deployed in the Pentland F...
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