Theoretical and applied external ear acoustics.

@article{Ballachanda1997TheoreticalAA,
  title={Theoretical and applied external ear acoustics.},
  author={Bopanna B Ballachanda},
  journal={Journal of the American Academy of Audiology},
  year={1997},
  volume={8 6},
  pages={411-20}
}
The external ear (pinna and earcanal) plays a major role in transforming acoustic signals from free field to the tympanic membrane in humans. It acts as a filter to reduce low frequencies, a resonator to enhance mid frequencies (2.0 to 7.0 kHz), and a direction-dependent filter at high frequencies to augment spatial perception. The external ear transfer function is altered by variations in the physical dimension of the external ear either due to individual differences or due to mechanical… CONTINUE READING
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