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. 2021 Sep 1;3:724539. doi: 10.3389/fdgth.2021.724539

Figure 1.

Figure 1

Spectrums of modulation distortion produced by a single speaker (A) vs. true DPOAE obtained with a two-speaker probe (B). The primary frequencies are f1 = 1, 000 Hz and f2 = 1, 200 Hz.