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

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Copyright © 2021 Hsiao, Chen and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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An example of DPOAE estimation by the cancellation strategy when f₁ is 1,000 Hz, viewed in the frequency domain. (A) The signal recorded by using a single speaker. (B) The desired signal recorded by using two speakers. (C) The signal recorded by using adjusted input signal in Figure 5.