Best application of head-related transfer functions for competing voices speech recognition in hearing-impaired listeners
When presenting separated speech sources over hearing aids, should the normal physical spatial cues be restored? The answer was sought by presenting speech sources to a listener via headphones, either directly or after application of generic head-related-transfer functions (HRTF) in different modes to simulate free-field listening. For the presentation of two competing voices, we have measured the relative monaural and binaural contributions to speech intelligibility using a previously developed competing voices test. Two consecutive tests, using 13 and 10 hearing-impaired listeners with moderate, sloping hearing losses were conducted, combining different HRTF modes and horizontal plane angles. We found that neither the monaural HRTF gain nor the binaural cues imposed through crosstalk do affect the speech recognition. The only factor improving the competing voices scores is a large spatial separation, with as little mixing of the two voices as possible.
Bramsløw, L., Vatti, M., Hietkamp, R.K., and Pontoppidan, N.H. (2014). “Design of a competing voices test;” Poster presented at International Hearing Aid Conference (IHCON) 2014, Lake Tahoe, CA, USA. Available at: http://www.eriksholm.com/about-us/news/IHCON_2014.
Bramsløw, L., Vatti, M., Hietkamp, R.K., and Pontoppidan, N.H. (2015). “Binaural speech recognition for normal-hearing and hearing-impaired listeners in a compe-ting voice test. Poster presented at Speech in Noise Workshop 2015, Copenhagen. Available at: http://www.eriksholm.com/about-us/news/2015/SPIN_2015.
Brungart, D.S. and Simpson, B.D. (2005). “Improving multitalker speech communication with advanced audio displays,” In New Directions for Improving Audio Effectiveness. Neuilly-Sur-Seine, France, pp. 30/1-30/18.
Moore, B.C.J. and Glasberg, B.R. (1998). “Use of a loudness model for hearing-aid fitting. I. Linear hearing aids,” Br. J. Audiol., 32, 317-335.
Nilsson, M., Soli, S.D., and Sullivan, J.A. (1994). Development of the Hearing In Noise Test for the measurement of speech reception thresholds in quiet and in noise,” J. Acoust. Soc. Am., 95, 1085-1099.
Studebaker, G.A. (1985). “A “rationalized” arcsine transform,” J. Speech Hear. Res., 28, 455-462.
Authors who publish with this journal agree to the following terms:
a. Authors retain copyright* and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
b. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
c. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
*From the 2017 issue onward. The Danavox Jubilee Foundation owns the copyright of all articles published in the 1969-2015 issues. However, authors are still allowed to share the work with an acknowledgement of the work's authorship and initial publication in this journal.