FIG. 4.

(Color online) Normal adult ear A. Equivalent tympanometric admittance at TM using downwards sweep. Top left: tympanometric magnitude at TPP, P_pt, and P_nt compared to ambient magnitude replotted from Fig. 1 (middle). TPP, S, L, and volume $V=S\times L$ of enclosed ear canal in displayed text. Top right: tympanometric phase at TPP, P_pt, and P_nt compared to ambient phase replotted from Fig. 1 (middle). f₄₅ in displayed text. Rows 2–4: Magnitude and phase of single-frequency tympanograms for equivalent admittance at TM at octave frequencies of 0.25, 0.5, 1, 2, 4, and 8 kHz, with circle symbol at TPP. The legend in the 0.25 kHz tympanogram shows the line styles for magnitude and phase used in the other single-frequency tympanograms. Text in each panel lists values of TPP, TW, ΔYM, and ΔYP.