Mechanism for bandpass frequency characteristic in distortion product otoacoustic emission generation

The Journal of the Acoustical Society of America
P F FaheyG K Martin

Abstract

It is commonly observed that the levels of the 2f1-f2 and the other mf1-nf2 (m = n + 1 = integer) distortion product otoacoustic emissions (DPOAEs) initially increase in level for fixed f2 as fl -->f2, starting at f1 <f2, and then begin to decrease. When these DPOAE levels are plotted as a function of either the distortion product frequency (fdp) or f2/f1 the curve has an approximate bandpass shape. It has been hypothesized that this effect is due to (1) a second filter, (2) suppression of distortion generation by the primary tones, (3) reemission of distortion products from the distortion product place (on the basilar membrane), (4) the presence of an even order nonlinearity, and (5) cancellation of the DPOAE due to the vector addition of multiple sources of distortion product. In this study distortion products were produced with f1 sweep conditions where there would be minimal vector cancellation of multiple DPOAE sources. It was observed that under this condition, there is no or minimal bandpass shape of the DPOAE generation curve. Therefore, the data support the hypothesis that the bandpass shape obtained with traditional f1 sweeps is due to vector cancellation from multiple sources.

References

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Citations

Feb 12, 2009·The Journal of the Acoustical Society of America·P F FaheyG K Martin
Feb 12, 2009·The Journal of the Acoustical Society of America·Lin Bian, Shixiong Chen
Jul 19, 2013·The Journal of the Acoustical Society of America·Glen K MartinBrenda L Lonsbury-Martin
Oct 31, 2006·The Journal of the Acoustical Society of America·Robert H Withnell, Jill Lodde
Apr 6, 2007·The Journal of the Acoustical Society of America·Christopher A SheraJohn J Guinan
Mar 14, 2007·The Journal of the Acoustical Society of America·Christopher A Shera, John J Guinan
Feb 15, 2007·The Journal of the Acoustical Society of America·Andrei N LukashkinIan J Russell
Oct 12, 2007·The Journal of the Acoustical Society of America·Lin Bian, Nicole M Scherrer
Oct 27, 2009·Hearing Research·Andrei N LukashkinIan J Russell
Apr 9, 2013·International Journal of Pediatric Otorhinolaryngology·Wafaa A Kaf, Ali A Danesh
May 28, 2016·Journal of the Association for Research in Otolaryngology : JARO·Glen K MartinBrenda L Lonsbury-Martin
Oct 19, 2013·Physiological Reviews·Paul AvanChristine Petit
Sep 2, 2020·Hearing Research·Glen K MartinBrenda L Lonsbury-Martin

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