THE AUDITORY MODELING TOOLBOX

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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:

  1. SOFA API from http://sourceforge.net/projects/sofacoustics for Matlab (in e.g. thirdparty/SOFA)
  2. 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.