THE AUDITORY MODELING TOOLBOX

Applies to version: 1.2.0

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ZIEGELWANGER2014 - Time of arrival estimates

Usage

[Obj,results]=ziegelwanger2014(data,estimation,outlierDetection,model,p0_onaxis)

Input parameters

Obj SOFA object
estimation

(optional) TOA estimation method:

[TOAest] pre-estimated TOAs

1 Built-in maximum detection

2 Built-in centroid of squared IR,

3 Built-in mean group delay,

4 Built-in maximum of the minimum-phase cross-correlation (default)

5 Built-in maxium detection after 3k-low-pass filtering (similar to Andreopoulou and Katz, 2017)

String (Experimental) Estimator from the 'itdestimator' function, requires further parameters

outlierDetection

(optional) detect outliers in estimated TOAs

0 off

1 on (default values: [0.05;0.01])

[alpha r] reject outliers using the extreme Studentized deviance test with the significance level of ALPHA and upper bound of outlier rate R

model

(optional) correct estimated toa, using geometrical TOA-Model

0 no model, just estimate the TOAs

1 (default) off-axis TOA modeled

2 on-axis TOA modeled

p0_onaxis (optional) startvalues for lsqcurvefit
lowpass (optional) bandwidth setting when used with the estimator from 'itdestimator' ('lp' for lowpass, 'bb' for broadband)
upper_cutfreq (optional) lowpass cutoff (Hz) when used with the estimator from 'itdestimator'
threshlvl (optional) threshold level (dB) when used with the 'Threshold' estimator from 'itdestimator'

Output parameters

Obj SOFA Object
results

struct with fields

.toa: data matrix with time of arrival (TOA) for each impulse response (IR)

.p_onaxis: estimated on-axis model-parameters

.p_offaxis: estimated off-axis model-parameters

Description

Estimates the Time-of-Arrival for each measurement in Obj (SOFA) and corrects the results with a geometrical model of the head.

Requirements:

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

Examples:

To calculate the model parameters for the on-axis time-of-arrival model (p_onaxis) and for the off-axis time-of-arrival model (p_offaxis) for a given HRTF set (SOFA object, 'Obj') with the minimum-phase cross-correlation estimation, use:

[Obj,results]=ziegelwanger2014(Obj,4,1);

References:

H. Ziegelwanger and P. Majdak. Modeling the direction-continuous time-of-arrival in head-related transfer functions. J. Acoust. Soc. Am., 135:1278--1293, 2014.

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