Zobrazeno 1 - 10
of 10
pro vyhledávání: '"David W. Lemonds"'
Autor:
Paul E. Nachtigall, Laura N. Kloepper, Brian K. Branstetter, Whitlow W. L. Au, David W. Lemonds, Stephanie Vlachos
Publikováno v:
The Journal of the Acoustical Society of America. 130:3107-3114
The auditory filter shape of delphinid odontocetes was previously considered to be typically mammalian constant-quality in which filter bandwidths increase proportionally with frequency. Recent studies with porpoises demonstrate constant-bandwidth po
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db617cf64e6a0bcbc635dbd23aec65cb
https://doi.org/10.1121/1.3644912
https://doi.org/10.1121/1.3644912
Autor:
David W. Lemonds, Paul E. Nachtigall, Whitlow W. L. Au, Herbert L. Roitblat, Stephanie Vlachos
Publikováno v:
Journal of Comparative Psychology. 116:151-157
The hearing sensitivity of an Atlantic bottlenose dolphin (Tursiops truncatus) to both pure tones and broadband signals simulating echoes from a 7.62-cm water-filled sphere was measured. Pure tones with frequencies between 40 and 140 kHz in increment
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0fff0d00b9251aea66d50a3c05e5af12
https://doi.org/10.1037/0735-7036.116.2.151
https://doi.org/10.1037/0735-7036.116.2.151
Publikováno v:
The Journal of the Acoustical Society of America. 132(2)
High-frequency auditory filter shapes of an Atlantic bottlenose dolphin (Tursiops truncatus) were measured using a notched noise masking source centered on pure tone signals at frequencies of 40, 60, 80 and 100 kHz. A dolphin was trained to swim into
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46dafd691b74e249702f1177ebb96f5f
https://pubmed.ncbi.nlm.nih.gov/22894241
https://pubmed.ncbi.nlm.nih.gov/22894241
Publikováno v:
The Journal of the Acoustical Society of America. 119(3)
The focus of this study was to investigate how dolphins use acoustic features in returning echolocation signals to discriminate among objects. An echolocating dolphin performed a match-to-sample task with objects that varied in size, shape, material,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab820e227eed7b0120ab38ad3b9d9927
https://pubmed.ncbi.nlm.nih.gov/16583925
https://pubmed.ncbi.nlm.nih.gov/16583925
Publikováno v:
SPIE Proceedings.
Acoustic detection and classification of buried mines presents a challenging and, as of yet, unsolved object recognition problem. Techniques for detecting and classifying mine-like targets in backscatter images created with broadband sonars are start
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7947a35cfb6aa9928ae575953332cfb
https://doi.org/10.1117/12.445446
https://doi.org/10.1117/12.445446
Publikováno v:
Hearing by Whales and Dolphins ISBN: 9781461270249
Whales and dolphins have evolved in a sensory world very unlike our own. Although one can guess what the perceptions of a cetacean might be, it is impossible to “get inside a dolphins head” and experience what it must be like to hear sounds over
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fea8a596d2506f8bbf40bba5bc8e8581
https://doi.org/10.1007/978-1-4612-1150-1_8
https://doi.org/10.1007/978-1-4612-1150-1_8
Autor:
David W. Lemonds, Gordon S. Okimoto
Publikováno v:
SPIE Proceedings.
Principal component analysis (PCA) in the wavelet domain provides powerful features for underwater object recognition applications. The multiresolution analysis of the Morlet wavelet transform (MWT) is used to pre-process echo returns from targets en
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e46ff544cb1c917af212e4dc20e8d388
https://doi.org/10.1117/12.357091
https://doi.org/10.1117/12.357091
Publikováno v:
SPIE Proceedings.
Signal features based on multiresolution short-time Fourier transforms (STFT) and the Morlet wavelet transform (MWT) have been developed to classify echo returns from targets ensonified by simulated dolphin echolocation clicks. Spectrogram features a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9aa8c49a346625601b5a1a8192e175c4
https://doi.org/10.1117/12.324204
https://doi.org/10.1117/12.324204
Publikováno v:
The Journal of the Acoustical Society of America. 107:2784-2785
The Atlantic bottlenose dolphin has a sonar detection range of 72 m for a 2.54‐cm solid sphere and 113 m for a 7.63‐cm water‐filled sphere in a noise‐limited environment. However, there are many natural environments in which the ambient noise
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65c2c53787390870448bdb84dc384ad4
https://doi.org/10.1121/1.429307
https://doi.org/10.1121/1.429307
Autor:
Stephanie Vlachos, Paul E. Nachtigall, Whitlow W. L. Au, Herbert L. Roitblat, David W. Lemonds
Publikováno v:
The Journal of the Acoustical Society of America. 102:3102-3102
Frequency selectivity capabilities of an Atlantic bottlenose dolphin were examined by calculating critical ratios from masked hearing data. Absolute sensitivity to pure tones from 40–140 kHz was measured as a base line, and masked sensitivity was d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2eb53e2c88d3c7da7efee883fe9e93f3
https://doi.org/10.1121/1.420509
https://doi.org/10.1121/1.420509