Investigating low-frequency compression using the Grid method

  • Michal Fereczkowski Hearing Systems, Department of Electrical Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
  • Torsten Dau Hearing Systems, Department of Electrical Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
  • Ewen N. MacDonald Hearing Systems, Department of Electrical Engineering, Technical University of Denmark, Kongens Lyngby, Denmark

Abstract

There is an ongoing discussion about whether the amount of cochlear compression in humans at low frequencies (below 1 kHz) is as high as that at higher frequencies. It is controversial whether the compression affects the slope of the off-frequency forward masking curves at those frequencies. Here, the Grid method with a 2-interval 1-up 3-down tracking rule was applied to estimate forward masking curves at two characteristic frequencies: 500 Hz and 4000 Hz. The resulting curves and the corresponding basilar membrane input-output (BM I/O) functions were found to be comparable to those reported in literature. Moreover, slopes of the low-level portions of the BM I/O functions estimated at 500 Hz were examined, to determine whether the 500-Hz off-frequency forward masking curves were affected by compression. Overall, the collected data showed a trend confirming the compressive behaviour. However, the analysis was complicated by unexpectedly steep portions of the collected on- and off-frequency forward masking curves.

References

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Published
2015-12-15
How to Cite
FERECZKOWSKI, Michal; DAU, Torsten; MACDONALD, Ewen N.. Investigating low-frequency compression using the Grid method. Proceedings of the International Symposium on Auditory and Audiological Research, [S.l.], v. 5, p. 413-420, dec. 2015. Available at: <https://proceedings.isaar.eu/index.php/isaarproc/article/view/2015-49>. Date accessed: 20 nov. 2017.
Section
2015/7. Novel methods for behavioral & objective assessment of hearing function