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Re: Frequency dependecy of sound localization

An important complication in all of these is the choice of stimulus.  Macpherson and Middlebrooks investigate effects of suppressing or enhancing the envelope ITD cue, which is an important part of what gets used at high frequencies.  Studies that only use tones or bandpass filtered steady noises naturally find much lower weights on high-frequency ITD, since there's less there to go on.

Some studies look at maximally impulsive stimuli, such as filtered random click trains or such, where high-frequency ITD can be more robustly informative.  But I don't know if they have investigated spectral weighting of ITD and ILD for such sounds.  The abstract of this one looks relevant:
Auditory Localization of Clicks
Bruce H. Deatherage and Ira J. Hirsh


On Fri, Apr 4, 2014 at 3:15 AM, Axel Ahrens <ahrens.axel@xxxxxxxxx> wrote:
Dear Jungfeng, Dear list,
we are currently working on spectral weighting of spatial cues. You might be interested in some publications I read:

-Stern, M., & Zeiberg, S. (1988). Lateralization of complex binaural stimuli: A weighted-image model. Journal of the Acoustical Society of America, 1, 156–165.

which is partly based on Raatgevers doctoral dissertation from 1980.

-Macpherson, E. A., & Middlebrooks, J. C. (2002). Listener weighting of cues for lateral angle: The duplex theory of sound localization revisited. The Journal of the Acoustical Society of America, 111(5), 2219. doi:10.1121/1.1471898

-Le Goff, N., Buchholz, J. M., & Dau, T. (2013). SPECTRAL INTEGRATION OF INTERAURAL TIME DIFFERENCES IN AUDITORY LOCALIZATION. International Congress on Acoustics. Montréal. (Poster)

-Buell, T. N., & Hafter, E. R. (1991). Combination of binaural information across frequency bands. The Journal of the Acoustical Society of America, 90(4 Pt 1), 1894–900.

Our own current work is still in an early stage and not published yet. If you need any further information do not hesitate to contact me.
Axel Ahrens
Technical University of Denmark

Kind regards / Mit freundlichen Grüßen

Axel Ahrens

Daugaardsvej 2

2800 Kongens Lyngby


+45 60 52 67 70



2014-04-03 11:03 GMT+02:00 Li Junfeng <junfeng@xxxxxxxxxxx>:

Dear all,

As all of you may know, human sound localization is a quite complex procedure and highly dependent on the ITD, ILD, spectral cues and others. All these cues are encoded in HRTF. Many previous studies have shown that for horizontal sound localization, ITD play a important role in the low frequencies and ILD is dominant cue in the high frequencies; for vertical sound localization, spectral cues in the high frequencies are normally important. Thess are already known knowledge.

>From the previous research results, I beleive that different frequencies should contribute differently to horizontal and vertical sound localization. Furthermore, I am now wondering how we can quantify this difference, that is, is there a quantitative way to describe the different contribution of different frequencies to sound localization. (As you may know, in speech perception field, the band-importance functions quantify the contribution of different frequencies to speech intelligibility). I am also looking for the frequency/band-imporance functions which describe the contribution of different frequencies to human sound localization.

Does anyone know some work on this research to recommend or some ideas to share?

I would like to appreciate any discussions and references very much.

Thanks a lot.

Best regards,