High Frequency Components In Bottlenose Dolphin Echolocation Signals
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High Frequency Components In Bottlenose Dolphin Echolocation Signals
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Author : Ronald W. Toland, Jr.
language : en
Publisher:
Release Date : 1998-09-01
High Frequency Components In Bottlenose Dolphin Echolocation Signals written by Ronald W. Toland, Jr. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-09-01 with categories.
The research described in this thesis is a continuation of work started by the Applied Research Laboratories of the University of Texas at Austin into the analysis of biosonar signals. Experiments conducted in 1997 on two species of small toothed whales found these species to emit significant high frequency signal components, extending to as high as 400 to 500 kHz. To assess the importance of these high frequencies in dolphin echolocation and target identification, experiments were performed in which an acoustic filter, used to suppress the high frequencies, was placed between a dolphin and a target. Insertion Loss and Reflection Loss measurements performed on 1/4" thick and 1/2" thick Sound Absorbing Filters (SOAB) demonstrated their effectiveness at absorbing high frequencies above 150 kHz, with little reflectivity. The results from one echolocation experiment, with one dolphin, showed the animal's ability to classify targets was essentially unaffected by the insertion of the filters. Analysis of the dolphin's echolocation signals showed the animal definitely compensating for the filters, by increasing its sound energy output, especially at frequencies above 100 kHz. It is anticipated that this initial experiment will lead to future research in explaining the existence of these high frequency echolocation components.
High Frequency Components In Bottlenose Dolphin Echolocation Signals
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Author : Ronald W. Toland
language : en
Publisher:
Release Date : 1998
High Frequency Components In Bottlenose Dolphin Echolocation Signals written by Ronald W. Toland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The research described in this thesis is a continuation of work started by the Applied Research Laboratories of the University of Texas at Austin into the analysis of biosonar signals. Experiments conducted in 1997 on two species of small toothed whales found these species to emit significant high frequency signal components, extending to as high as 400 to 500 kHz. To assess the importance of these high frequencies in dolphin echolocation and target identification, experiments were performed in which an acoustic filter, used to suppress the high frequencies, was placed between a dolphin and a target. Insertion Loss and Reflection Loss measurements performed on 1/4" thick and 1/2" thick Sound Absorbing Filters (SOAB) demonstrated their effectiveness at absorbing high frequencies above 150 kHz, with little reflectivity. The results from one echolocation experiment, with one dolphin, showed the animal's ability to classify targets was essentially unaffected by the insertion of the filters. Analysis of the dolphin's echolocation signals showed the animal definitely compensating for the filters, by increasing its sound energy output, especially at frequencies above 100 kHz. It is anticipated that this initial experiment will lead to future research in explaining the existence of these high frequency echolocation components.
Transmitting Beam Patterns Of The Atlantic Bottlenose Dolphin Tursiops Truncatus
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Author : Tobias J. Lemerande
language : en
Publisher:
Release Date : 2002-06-01
Transmitting Beam Patterns Of The Atlantic Bottlenose Dolphin Tursiops Truncatus written by Tobias J. Lemerande and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-06-01 with categories.
In January 2002, time synchronized underwater pictures and echolocation signals of a free-swimming bottlenose dolphin were recorded. More than 80 experimental trial runs were recorded at the Space and Naval Warfare Center's Marine Mammal Facility in San Diego, California. The apparatus recorded 30 underwater images per second and sonar signals up to 400 kHz. Data analysis shows wide transmitting beam patterns at frequencies lower than 135 kHz contain a majority of the energy in the echolocation signal, agreeing with previously documented work. However, further analysis shows significant energy at higher frequencies. Early in the experiment, the dolphin steered narrow high frequency signals and adjusted the energy content in those different frequencies while scanning the target. To emit these high frequency components, the dolphin changed the wave shape of the emitted sound pulse. As the experiment progressed, the animals task became routine and the high frequency signals were noticeably absent until low frequency noise was projected into the water, at which time the high frequencies were again present in the emitted sound pulses. Resultant transmitting beam patterns provide excellent evidence of the presence of high frequency sound emissions, and also indicate how these signals are used during echolocation tasks.
High Frequency Sonar Components Of Normal And Hearing Impaired Dolphins
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Author : David C. Dye
language : en
Publisher:
Release Date : 2000-09-01
High Frequency Sonar Components Of Normal And Hearing Impaired Dolphins written by David C. Dye and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-09-01 with categories.
A data acquisition device was constructed and tested to obtain toothed whale (Bottlenose Dolphin and Beluga Whale) sonar signals and digitally store them to a PC hard drive. The device had the capability of capturing sonar signals by means of a two-hydrophone array, and a digital video camera in a submersible housing. Cooperation with marine biologists at SSC San Diego enabled the sampling of three animals performing echolocation tasks. Their sonar signals, transmissions of rapid high frequency pulses called clicks, were recorded for further processing. Once the data was captured on video and hard disk drive, it was processed using MATLAB. Data from three different toothed whales, a normal Bottlenose Dolphin, a Bottlenose Dolphin with a hearing impairment and a Beluga Whale, was analyzed. It was observed that the animals reduced the interval between clicks when they located a target. Correlating the signal data to the video data made this observation possible. It appeared the animals searched with widely spaced clicks, then narrowed the click period upon target detection. Also, it was noted that the frequency of isolated clicks decreased as click period decreased. However, the hearing impaired Dolphin maintained his click frequency regardless of click periodicity.
The Sonar Of Dolphins
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Author : Whitlow W.L. Au
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
The Sonar Of Dolphins written by Whitlow W.L. Au and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Medical categories.
The extraordinary ability of dolphins to echolocate has fascinated scientists and the public since its discovery in the late 1950's. This is the first book to summarize modern research in this area, and presents a broad synthesis of this very interdisciplinary subject. The author is an internationally-recognized expert on dolphin sonar and is thus in a unique position to bring together research on the physiological, mathematical and engineering aspects of the subject. Of interest to auditory researchers, electrical engineers, acoustical physicists, and mammalian physiologists.
Hearing By Whales And Dolphins
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Author : Whitlow W.L. Au
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Hearing By Whales And Dolphins written by Whitlow W.L. Au and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Here, experts in different areas of the field provide an overview of the bioacoustics of whales and dolphins as well as a thorough introduction to the subject for investigators of hearing in other animals. Topics covered include the structure and function of cetacean auditory systems, the unique sound production system of odontocetes, acoustic communication, psychoacoustics, echolocation and models of sound propagation.
Echolocation In Bats And Dolphins
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Author : Jeanette A. Thomas
language : en
Publisher: University of Chicago Press
Release Date : 2004
Echolocation In Bats And Dolphins written by Jeanette A. Thomas and has been published by University of Chicago Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Nature categories.
Although bats and dolphins live in very different environments, are vastly different in size, and hunt different kinds of prey, both groups have evolved similar sonar systems, known as echolocation, to locate food and navigate the skies and seas. While much research has been conducted over the past thirty years on echolocation in bats and dolphins, this volume is the first to compare what is known about echolocation in each group, to point out what information is missing, and to identify future areas of research. Echolocation in Bats and Dolphins consists of six sections: mechanisms of echolocation signal production; the anatomy and physiology of signal reception and interpretation; performance and cognition; ecological and evolutionary aspects of echolocation mammals; theoretical and methodological topics; and possible echolocation capabilities in other mammals, including shrews, seals, and baleen whales. Animal behaviorists, ecologists, physiologists, and both scientists and engineers who work in the field of bioacoustics will benefit from this book.
Nrl Report
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Author :
language : en
Publisher:
Release Date : 1981
Nrl Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Naval research categories.
Whales And Dolphins
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Author : Alekseĭ Vladimirovich I︠A︡blokov
language : en
Publisher:
Release Date : 1974
Whales And Dolphins written by Alekseĭ Vladimirovich I︠A︡blokov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Dolphins categories.
Advances In Marine Biology
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Author : Michael P. Lesser
language : en
Publisher: Academic Press
Release Date : 2013-01-17
Advances In Marine Biology written by Michael P. Lesser and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-01-17 with Science categories.
Advances in Marine Biology has been providing in-depth and up-to-date reviews on all aspects of marine biology since 1963 -- over 40 years of outstanding coverage! The series is well known for both its excellence of reviews and editing. Now edited by Michael Lesser (University of New Hampshire, USA), with an internationally renowned Editorial Board, the serial publishes in-depth and up-to-date content on a wide range of topics that will appeal to postgraduates and researchers in marine biology, fisheries science, ecology, zoology, and biological oceanography. Advances in Marine Biology has been providing in-depth and up-to-date reviews on all aspects of marine biology since 1963