Auditory filter shapes for the bottlenose dolphin (Tursiops truncatus) and the white whale (Delphinapterus leucas) derived with notched noise
| Autor: | Donald A. Carder, Sam H. Ridgway, Carolyn E. Schlundt, James J. Finneran |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Physics
Acoustics and Ultrasonics biology Dolphins Acoustics Noise spectral density Bandwidth (signal processing) Whales Auditory Threshold White whale Bottlenose dolphin biology.organism_classification Models Biological Behavioral response Hearing Arts and Humanities (miscellaneous) Tone Frequency Auditory Perception Animals Center frequency Noise Perceptual Masking Leucas |
| Zdroj: | The Journal of the Acoustical Society of America. 112:322-328 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.1488652 |
| Popis: | Auditory filter shapes were estimated in two bottlenose dolphins (Tursiops truncatus) and one white whale (Delphinapterus leucas) using a behavioral response paradigm and notched noise. Masked thresholds were measured at 20 and 30 kHz. Masking noise was centered at the test tone and had a bandwidth of 1.5 times the tone frequency. Half-notch width to center frequency ratios were 0, 0.125, 0.25, 0.375, and 0.5. Noise spectral density levels were 90 and 105 dB re: 1 microPa2/Hz. Filter shapes were approximated using a roex(p,r) function; the parameters p and r were found by fitting the integral of the roex(p,r) function to the measured threshold data. Mean equivalent rectangular bandwidths (ERBs) calculated from the filter shapes were 11.8 and 17.1% of the center frequency at 20 and 30 kHz, respectively, for the dolphins and 9.1 and 15.3% of the center frequency at 20 and 30 kHz, respectively, for the white whale. Filter shapes were broader at 30 kHz and 105 dB re: 1 microPa2/Hz masking noise. The results are in general agreement with previous estimates of ERBs in Tursiops obtained with a behavioral response paradigm. |
| Databáze: | OpenAIRE |
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