3D SOUND SERVEY

• To strive, to seek, to find, and not to yield - Tennyson




• That the powerful play goes on
  and you might contribute a verse - Walt Whitman

4 cues relative to distance

• First power law for stimulus pressure



• Selective attenuation of high freauency due to
  absorption by the atmosphere

      - 0.1 dB per meter(only high frequence)



• proportion of direct to reverberant sound



• absolute motion parallax

      - as an observer passes by a source with unchanging
        head orientation, the azimuth of the source change
      - see fig. 2.



• result

      - 2/15 intracranially (頭蓋)
      - 13/14 external