THE AUDITORY MODELING TOOLBOX

Applies to version: 1.3.0

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DIETZ2011_FILTERBANK - filterbank of Dietz 2011 binaural model

Usage

[...] = dietz2011_filterbank(insig,fs,fc);

Input parameters

insig binaural signal for which values should be calculated
fs sampling rate (Hz)
fc center frequencies of gammatone filterbank

Output parameters

outsig_fine output signal of fine structure filter
fc_fine center frequencies processed with fine structure filter
outsig_env output signal of envelope filter
fc_env center frequencies processed with modulation filter
outsig_ild output signal of ILD filter

Description

dietz2011_filterbank(insig,fs,fc) filters all frequency channels of insig with a modulation filterbank consisting of three filters. One centered at the center frequencies for the fine structure of the signals. One centered at a fixed frequency of 135 Hz for the envelope of the signals. And one a lowpass filter with a cutoff frequency of 30 Hz for the calculation of the interaural level difference.

dietz2011_filterbank accepts the following optional parameters:

'filter_order',fo Filter order for the two gammatone filter used for the fine structure and envelope of the modulation filter bank. The default value is 2.
'filter_attenuation_db',fadb
 Filter attenuation for the two gammatone filter used for the fine structure and envelope of the modulation filter bank. The default value is 10.
'fine_filter_finesse',fff
 Filter finesse (determines the bandwidth with fc/finesse) for the fine structure gammatone filter. The defulat value is 3.
'mod_center_frequency_hz',mcf_hz
 Center frequency of the gammatone envelope filter. The default value is 135.
'mod_filter_finesse',mff
 Filter finesse (determines the bandwidth with fc/finesse) for the envelope gammatone filter. The defulat value is 8.
'level_filter_cutoff_hz',lfc_hz
 Cutoff frequency off the low pass filter used for ILD calculation. The default value is 30.
'level_filter_order',lforder
 Order of low pass filter for the ILD calculation. The default value is 2.

References:

M. Dietz, S. D. Ewert, and V. Hohmann. Auditory model based direction estimation of concurrent speakers from binaural signals. Speech Communication, 53(5):592--605, 2011. [ DOI | http ]