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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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The 3rd-order filter coefficients h₃[n] under (A) f₁ = 1, 000 Hz and (B) f₁ = 2, 000 Hz. The length of the filter was set to 300, which corresponds to 6.25 ms at 48 kHz sampling rate.