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. 2015 Dec 21;138(6):3785–3799. doi: 10.1121/1.4937611

FIG. 10.

FIG. 10.

Although this study focuses on the optimal parameters for the collection of the total DPOAE (including both distortion and reflection components), a rapid way to isolate the distortion component from the reflection component of the response is to use a long window, 500 ms, with a too-fast sweeping rate, 0.5 octave/s. This effectively isolates the shorter-latency distortion energy from the later reflection energy. The main panel displays DPOAE fine structure from one adult ear (dotted line) and the distortion component of the DPOAE extracted using an inverse FFT (gray line) versus the above-described LSF-based method (black line). The two distortion-component measures are nearly indistinguishable. This is further elucidated for group data by the inset, which displays individual differences in dB for all adult subjects as thin gray lines and a loess trend line superimposed in black. The average overall difference between IFFT and LSF-based estimates of the distortion component was 0.4 dB.