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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ftdtic:ADA384477 2023-05-15T15:41:46+02:00 High Frequency Sonar Components of Normal and Hearing Impaired Dolphins Dye, David C. NAVAL POSTGRADUATE SCHOOL MONTEREY CA 2000-09 text/html http://www.dtic.mil/docs/citations/ADA384477 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA384477 en eng http://www.dtic.mil/docs/citations/ADA384477 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Biology Acoustics *SONAR SIGNALS *DOLPHINS(MAMMALS) THESES DATA ACQUISITION HYDROPHONES TARGET DETECTION VIDEO SIGNALS HEARING ECHO RANGING DEAFNESS ECHOLOCATION SIGNALS Text 2000 ftdtic 2016-02-20T06:35:19Z 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. Text Beluga Beluga whale Beluga* toothed whale toothed whales Defense Technical Information Center: DTIC Technical Reports database |
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Defense Technical Information Center: DTIC Technical Reports database |
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English |
topic |
Biology Acoustics *SONAR SIGNALS *DOLPHINS(MAMMALS) THESES DATA ACQUISITION HYDROPHONES TARGET DETECTION VIDEO SIGNALS HEARING ECHO RANGING DEAFNESS ECHOLOCATION SIGNALS |
spellingShingle |
Biology Acoustics *SONAR SIGNALS *DOLPHINS(MAMMALS) THESES DATA ACQUISITION HYDROPHONES TARGET DETECTION VIDEO SIGNALS HEARING ECHO RANGING DEAFNESS ECHOLOCATION SIGNALS Dye, David C. High Frequency Sonar Components of Normal and Hearing Impaired Dolphins |
topic_facet |
Biology Acoustics *SONAR SIGNALS *DOLPHINS(MAMMALS) THESES DATA ACQUISITION HYDROPHONES TARGET DETECTION VIDEO SIGNALS HEARING ECHO RANGING DEAFNESS 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. |
author2 |
NAVAL POSTGRADUATE SCHOOL MONTEREY CA |
format |
Text |
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 |
publishDate |
2000 |
url |
http://www.dtic.mil/docs/citations/ADA384477 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA384477 |
genre |
Beluga Beluga whale Beluga* toothed whale toothed whales |
genre_facet |
Beluga Beluga whale Beluga* toothed whale toothed whales |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA384477 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
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1766374653640572928 |