THE AUDITORY MODELING TOOLBOX
BAUMGARTNER2014 - Model for localization in saggital planes
Usage
[p,respang] = baumgartner2014( target,template ) [p,respang,tang] = baumgartner2014( target,template ) [p,respang,tang] = baumgartner2014( target,template,fs,S,lat,stim,fsstim )
Input parameters
| target | binaural impulse response(s) referring to the directional transfer function(s) (DFTs) of the target sound(s). |
| template | binaural impulse responses of all available listener-specific DTFs of the sagittal plane referring to the perceived lateral angle of the target sound |
Output parameters
| p | predicted probability mass vectors for response angles with respect to target positions 1st dim: response angle 2nd dim: target angle |
| respang | polar response angles (after regularization of angular sampling) |
| tang | polar target angles (usefull if sagittal-plane HRTFs are extracted directly from SOFA object) |
Description
baumgartner2014(...) is a model for sound-source localization in sagittal planes (SPs). It bases on the comparison of internal sound representation with a template and results in a probabilistic prediction of polar angle response.
baumgartner2014 accepts the following optional parameters:
| 'fs',fs | Define the sampling rate of the impulse responses. Default value is 48000 Hz. |
| 'S',S | Set the listener-specific sensitivity threshold (threshold of the sigmoid link function representing the psychometric link between transformation from the distance metric and similarity index) to S. Default value is 1. |
| 'lat',lat | Set the apparent lateral angle of the target sound to lat. Default value is 0° (median SP). |
| 'stim',stim | Define the stimulus (source signal without directional features). As default an impulse is used. |
| 'fsstim',fss | Define the sampling rate of the stimulus. Default value is 48000 Hz. |
| 'flow',flow | Set the lowest frequency in the filterbank to flow. Default value is 700 Hz. |
| 'fhigh',fhigh | Set the highest frequency in the filterbank to fhigh. Default value is 18000 Hz. |
| 'space',sp | Set spacing of auditory filter bands (i.e., distance between neighbouring bands) to sp in number of equivalent rectangular bandwidths (ERBs). Default value is 1 ERB. |
| 'conGain',cg | Set the contralateral gain cg of the sigmoid function applied for binaural weighting of monaural similarity indices. Default value is 13 degrees. |
| 'polsamp',ps | Define the the polar angular sampling of the current SP. As default the sampling of ARI's HRTF format at the median SP is used, i.e., ps = [-30:5:70,80,100,110:5:210] degrees. |
| 'mrsmsp',mrs | Set the motoric response scatter mrs within the median sagittal plane. Default value is 17° in accordance with scatter of unimodal response distribution proposed in Langendijk and Bronkhorst (2002). |
baumgartner2014 accepts the following flags:
| 'gammatone' | Use the Gammatone filterbank for peripheral processing. This is the default. |
| 'cqdft' | Use a filterbank approximation based on DFT with constant relative bandwidth for peripheral processing. This was used by Langendijk and Bronkhorst (2002). |
| 'ihc' | Incorporate the transduction model of inner hair cells used by Dau et al. (1996). This is the default. |
| 'noihc' | Do not incorporate the IHC stage. |
| 'regular' | Apply spline interpolation in order to regularize the angular sampling of the polar response angle. This is the default. |
| 'noregular' | Disable regularization of angular sampling. |
Requirements:
- SOFA API from http://sourceforge.net/projects/sofacoustics for Matlab (in e.g. thirdparty/SOFA)
- Data in hrtf/baumgartner2014
References:
R. Baumgartner. Modeling sagittal-plane sound localization with the application to subband-encoded head related transfer functions. Master's thesis, University of Music and Performing Arts, Graz, June 2012. [ .pdf ]
R. Baumgartner, P. Majdak, and B. Laback. Assessment of Sagittal-Plane Sound Localization Performance in Spatial-Audio Applications, chapter 4, page expected print date. Springer-Verlag GmbH, accepted for publication, 2013.
E. Langendijk and A. Bronkhorst. Contribution of spectral cues to human sound localization. J. Acoust. Soc. Am., 112:1583-1596, 2002.
R. Patterson, I. Nimmo-Smith, J. Holdsworth, and P. Rice. An efficient auditory filterbank based on the gammatone function. APU report, 2341, 1988.
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