Biophysical Aspects of Directional Hearing in the Tammar Wallaby, Macropus Eugenii
作者： Anna Guppy , Roger B. Coles
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摘要: The biophysical properties of the external ear Tammar wallaby, Macropus eugenii (Desmarest), have been investigated using probe microphones implanted in canal. An acoustic axis pinna exists above 2kHz which is located close to horizonal plane for natural positions, whereas azimuthal location determined by orientation on head. maximum on-axis pressure gain reaches 25–30 dB frequencies near 5 kHz. This results from transformation horn-like combined with resonance auditory meatus. directionality similar sound diffraction a circular aperture an average radius based circumference face. These determine acceptance angle main lobe containing and spatial nulls. Large binaural intensity differences, exceeding 30dB, can be produced interaction peaks nulls between monaural directivity patterns, depending relative position each pinna.
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