Assessing the contribution of binaural cues for apparent source width perception via a functional model

Johannes Käsbach, Manuel Hahmann, Tobias May, Torsten Dau

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


In echoic conditions, sound sources are not perceived as point sources but appear to be expanded.
The expansion in the horizontal dimension is referred to as apparent source width
(ASW). To elicit this perception, the auditory system has access to fluctuations of binaural cues,
the interaural time differences (ITDs), interaural level differences (ILDs) and the interaural coherence
(IC). To quantify their contribution to ASW, a functional model of ASW perception was
exploited using the TWO!EARS auditory-front-end (AFE) toolbox. The model determines the leftand
right-most boundary of a sound source using a statistical representation of ITDs and ILDs
based on percentiles integrated over time and frequency. The model’s performance was evaluated
against psychoacoustic data obtained with noise, speech and music signals in loudspeakerbased
experiments. A robust model prediction of ASW was achieved using a cross-correlation
based estimation with either IC or ITDs, in contrast to a combination of ITDs and ILDs where the
performance slightly decreased.
Original languageEnglish
Title of host publicationProceedings of the 22nd international congress on acoustics
Number of pages10
Publication date2016
Article numberPaper ABS-768
Publication statusPublished - 2016
Event22nd International Congress on Acoustics : Acoustics for the 21st century - Catholic University of Argentina, Buenos Aires, Argentina
Duration: 5 Sep 20169 Sep 2016


Conference22nd International Congress on Acoustics
LocationCatholic University of Argentina
CityBuenos Aires
Internet address


  • Binaural listening
  • Spatial perception
  • Auditory modeling
  • Room acoustics
  • Virtual acoustics


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