Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena):
Receiving beam patterns of a harbor porpoise were measured in the horizontal plane, using narrow-band frequency modulated signals with center frequencies of 16, 64, and 100 kHz. Total signal duration was 1000 ms, including a 200 ms rise time and 300 ms fall time. The harbor porpoise was trained to p...
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fttno:oai:tudelft.nl:uuid:8a8c23f8-1199-46cf-a848-af9b34d33eb2 2023-05-15T17:59:15+02:00 Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena): Kastelein, R.A. Janssen, M. Verboom, W.C. Haan, D. de 2005-01-01 http://resolver.tudelft.nl/uuid:8a8c23f8-1199-46cf-a848-af9b34d33eb2 en eng uuid:8a8c23f8-1199-46cf-a848-af9b34d33eb2 238638 http://resolver.tudelft.nl/uuid:8a8c23f8-1199-46cf-a848-af9b34d33eb2 Journal of the Acoustical Society of America, 2, 118, 1172-1179 Marine Underwater acoustics Natural frequencies Transducers Beam patterns Horizontal plane Signal duration Threshold amplitude Audio acoustics Directional hearing Marine mammals Dolphins Echolocation Frequency modulation Hearing acuity Porpoise Sound detection Transducer Acoustic stimulation Phocoena Pitch Perception article 2005 fttno 2022-04-10T16:12:09Z Receiving beam patterns of a harbor porpoise were measured in the horizontal plane, using narrow-band frequency modulated signals with center frequencies of 16, 64, and 100 kHz. Total signal duration was 1000 ms, including a 200 ms rise time and 300 ms fall time. The harbor porpoise was trained to participate in a psychophysical test and stationed itself horizontally in a specific direction in the center of a 16-m-diameter circle consisting of 16 equally-spaced underwater transducers. The animal's head and the transducers were in the same horizontal plane, 1.5 m below the water surface. The go/no-go response paradigm was used; the animal left the listening station when it heard a sound signal. The method of constants was applied. For each transducer the 50% detection threshold amplitude was determined in 16 trials per amplitude, for each of the three frequencies. The beam patterns were not symmetrical with respect to the midline of the animal's body, but had a deflection of 3-7° to the right. The receiving beam pattern narrowed with increasing frequency. Assuming that the pattern is rotation-symmetrical according to an average of the horizontal beam pattern halves, the receiving directivity indices are 4.3 at 16 kHz, 6.0 at 64 kHz, and 11.7 dB at 100 kHz. The receiving directivity indices of the porpoise were lower than those measured for bottlenose dolphins. This means that harbor porpoises have wider receiving beam patterns than bottlenose dolphins for the same frequencies. Directivity of hearing improves the signal-to-noise ratio and thus is a tool for a better detection of certain signals in a given ambient noise condition. © 2005 Acoustical Society of America. Article in Journal/Newspaper Phocoena phocoena TU Delft: Institutional Repository (Delft University of Technology) |
institution |
Open Polar |
collection |
TU Delft: Institutional Repository (Delft University of Technology) |
op_collection_id |
fttno |
language |
English |
topic |
Marine Underwater acoustics Natural frequencies Transducers Beam patterns Horizontal plane Signal duration Threshold amplitude Audio acoustics Directional hearing Marine mammals Dolphins Echolocation Frequency modulation Hearing acuity Porpoise Sound detection Transducer Acoustic stimulation Phocoena Pitch Perception |
spellingShingle |
Marine Underwater acoustics Natural frequencies Transducers Beam patterns Horizontal plane Signal duration Threshold amplitude Audio acoustics Directional hearing Marine mammals Dolphins Echolocation Frequency modulation Hearing acuity Porpoise Sound detection Transducer Acoustic stimulation Phocoena Pitch Perception Kastelein, R.A. Janssen, M. Verboom, W.C. Haan, D. de Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena): |
topic_facet |
Marine Underwater acoustics Natural frequencies Transducers Beam patterns Horizontal plane Signal duration Threshold amplitude Audio acoustics Directional hearing Marine mammals Dolphins Echolocation Frequency modulation Hearing acuity Porpoise Sound detection Transducer Acoustic stimulation Phocoena Pitch Perception |
description |
Receiving beam patterns of a harbor porpoise were measured in the horizontal plane, using narrow-band frequency modulated signals with center frequencies of 16, 64, and 100 kHz. Total signal duration was 1000 ms, including a 200 ms rise time and 300 ms fall time. The harbor porpoise was trained to participate in a psychophysical test and stationed itself horizontally in a specific direction in the center of a 16-m-diameter circle consisting of 16 equally-spaced underwater transducers. The animal's head and the transducers were in the same horizontal plane, 1.5 m below the water surface. The go/no-go response paradigm was used; the animal left the listening station when it heard a sound signal. The method of constants was applied. For each transducer the 50% detection threshold amplitude was determined in 16 trials per amplitude, for each of the three frequencies. The beam patterns were not symmetrical with respect to the midline of the animal's body, but had a deflection of 3-7° to the right. The receiving beam pattern narrowed with increasing frequency. Assuming that the pattern is rotation-symmetrical according to an average of the horizontal beam pattern halves, the receiving directivity indices are 4.3 at 16 kHz, 6.0 at 64 kHz, and 11.7 dB at 100 kHz. The receiving directivity indices of the porpoise were lower than those measured for bottlenose dolphins. This means that harbor porpoises have wider receiving beam patterns than bottlenose dolphins for the same frequencies. Directivity of hearing improves the signal-to-noise ratio and thus is a tool for a better detection of certain signals in a given ambient noise condition. © 2005 Acoustical Society of America. |
format |
Article in Journal/Newspaper |
author |
Kastelein, R.A. Janssen, M. Verboom, W.C. Haan, D. de |
author_facet |
Kastelein, R.A. Janssen, M. Verboom, W.C. Haan, D. de |
author_sort |
Kastelein, R.A. |
title |
Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena): |
title_short |
Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena): |
title_full |
Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena): |
title_fullStr |
Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena): |
title_full_unstemmed |
Receiving beam patterns in the horizontal plane of a harbor porpoise (Phocoena phocoena): |
title_sort |
receiving beam patterns in the horizontal plane of a harbor porpoise (phocoena phocoena): |
publishDate |
2005 |
url |
http://resolver.tudelft.nl/uuid:8a8c23f8-1199-46cf-a848-af9b34d33eb2 |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Journal of the Acoustical Society of America, 2, 118, 1172-1179 |
op_relation |
uuid:8a8c23f8-1199-46cf-a848-af9b34d33eb2 238638 http://resolver.tudelft.nl/uuid:8a8c23f8-1199-46cf-a848-af9b34d33eb2 |
_version_ |
1766168021249818624 |