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. Author manuscript; available in PMC: 2008 Apr 15.
Published in final edited form as: J Acoust Soc Am. 2007 Oct;122(4):2154–2173. doi: 10.1121/1.2769625

FIG. 5.

FIG. 5

Variations in ear canal sound pressure PEC measured in 0.5-mm steps along trajectory L [see Fig. 2(b)] in ear 0402R with the probe tube microphone (MEEI) in response to a chirp stimulus. Shown is ΔPEC, the ratio of PEC in various locations along the trajectory to PEC near the umbo. (A) ΔPEC at six locations, plotted on a logarithmic frequency scale. Variations in ΔPEC are small below 30 kHz. Top: Magnitude ratio in decibels; bottom: phase difference. (B) ΔPEC in the six locations, shown individually on a linear frequency scale. Left: Magnitude ratios in decibels; right: phase differences. Arrows indicate frequencies of |ΔPEC| notches and frequencies where ∠ΔPEC crosses 0.25 or 0.75 cycles. (C) The ΔPEC curves from (B) superposed, plotted on a linear frequency scale. Top: Magnitude ratio in decibels; bottom: phase difference.