Unformatted text preview: ear Inclined from superiorlateral to
inferiomedial. Acoustic Function (I)
Acoustic Sound pressure gain:
source and TM
source Azimuth at horizontal plane Acoustic Functions (II)
Acoustic Sound pressure gain
– Effect of the pinna excluding concha: minimum.
– Effect of the ear canal: resonates at 3000 Hz.
– Effect of TM: high impedance at low frequency
and low impedance in the 1000 – 4000 Hz
range Acoustic Function (III)
Acoustic Transfer functions for different parts of out ears Acoustic Function (IV)
Acoustic Sound localization
– Cues for sound localization iintensity and phase (time) difference.
ntensity Any problem for these two cues?
Any – One main function for pinna Non-Auditory functions
Non-Auditory Protect TM and trap insects and dirt
– Fine hairs lined with the epithelium of the outer
– Cerumen (ear wax): secreted by the ceruminous
glands. Summery of Outer Ear
– The external ear canal Physiology
– Sound pressure gain
– Sound localization...
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- Summer '08
- Ear canal, outer ear canal