No Access Submitted: 15 August 2014 Accepted: 08 December 2014 Published Online: 18 February 2015
The Journal of the Acoustical Society of America 137, 679 (2015); https://doi.org/10.1121/1.4906157
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  • Acoustics, Department of Electronic Systems, Aalborg University, Aalborg, Denmark
  • b)Author to whom correspondence should be addressed. Electronic mail:

  • Preliminary reports of the data were presented at the 37th ARO MidWinter Meeting 2014 and the 7th Forum Acusticum 2014.

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  • Anders T. Christensen
  • Rodrigo Ordoñez
  • Dorte Hammershøi
Active amplifiers within the cochlea generate, as a by-product of their function, distortion-product otoacoustic emissions (DPOAEs) in response to specific two-tone stimuli. Focus has been on invoking emissions in a mid-frequency range from ∼0.5 to 4 kHz. The present study investigates stimulus parameters of the DPOAE at 2f1f2 frequencies below 0.5 kHz. Eighteen out of 21 young human adults screened had audiometrically normal hearing for inclusion in the experiment. DPOAEs were measured with pure-tone stimuli in four configurations: f2 fixed around 2.13 kHz, f2 fixed around 0.53 kHz, 2f1f2 fixed at 1.23 kHz and 0.25 kHz. Eight stimulus ratios, f2/f1, and three stimulus sound pressure levels, L1/L2, were measured in each configuration. Trends in ratio-magnitude responses for the mid-frequency DPOAE agree with those reported in previous literature. DPOAEs are not limited to distortion frequencies >0.5 kHz, but the stimulus ratio invoking the largest DPOAE in the mid-frequency range does not do so in the low-frequency range. Guiding the ratio according to the equivalent rectangular bandwidth of auditory filters maintains the DPOAE level.
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