High frequency sonar components of normal and hearing impaired dolphins
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 s...
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Monterey, California. Naval Postgraduate School
2000
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ftnavalpschool:oai:calhoun.nps.edu:10945/7708 2024-06-09T07:45:04+00:00 High frequency sonar components of normal and hearing impaired dolphins Dye, David C. Muir, Thomas G. Chiu, Ching-Sang 2000-09 xii, 72 p.;28 cm. application/pdf https://hdl.handle.net/10945/7708 en_US eng Monterey, California. Naval Postgraduate School https://hdl.handle.net/10945/7708 Marine Mammal Systems Bio-SONAR Mine Detection Dolphin SONAR Echolocation Signals Thesis 2000 ftnavalpschool 2024-05-15T00:08:33Z 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 Approved for public release; distribution is unlimited. Lieutenant, United States Navy http://archive.org/details/highfrequencyson109457708 Thesis Beluga Beluga whale Beluga* toothed whale toothed whales Naval Postgraduate School: Calhoun |
institution |
Open Polar |
collection |
Naval Postgraduate School: Calhoun |
op_collection_id |
ftnavalpschool |
language |
English |
topic |
Marine Mammal Systems Bio-SONAR Mine Detection Dolphin SONAR Echolocation Signals |
spellingShingle |
Marine Mammal Systems Bio-SONAR Mine Detection Dolphin SONAR Echolocation Signals Dye, David C. High frequency sonar components of normal and hearing impaired dolphins |
topic_facet |
Marine Mammal Systems Bio-SONAR Mine Detection Dolphin SONAR Echolocation Signals |
description |
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 Approved for public release; distribution is unlimited. Lieutenant, United States Navy http://archive.org/details/highfrequencyson109457708 |
author2 |
Muir, Thomas G. Chiu, Ching-Sang |
format |
Thesis |
author |
Dye, David C. |
author_facet |
Dye, David C. |
author_sort |
Dye, David C. |
title |
High frequency sonar components of normal and hearing impaired dolphins |
title_short |
High frequency sonar components of normal and hearing impaired dolphins |
title_full |
High frequency sonar components of normal and hearing impaired dolphins |
title_fullStr |
High frequency sonar components of normal and hearing impaired dolphins |
title_full_unstemmed |
High frequency sonar components of normal and hearing impaired dolphins |
title_sort |
high frequency sonar components of normal and hearing impaired dolphins |
publisher |
Monterey, California. Naval Postgraduate School |
publishDate |
2000 |
url |
https://hdl.handle.net/10945/7708 |
genre |
Beluga Beluga whale Beluga* toothed whale toothed whales |
genre_facet |
Beluga Beluga whale Beluga* toothed whale toothed whales |
op_relation |
https://hdl.handle.net/10945/7708 |
_version_ |
1801373985004322816 |