THE AUDITORY MODELING TOOLBOX
DIETZ2011_INTERAURALFUNCTIONS
Interaural stages of Dietz 2011
Input parameters:
| insig | input signal |
| fs | sampling frequencies |
| fc | center frequencies |
Output parameters:
| outp | Structure containing the output. See the description below. |
Description:
Calculate interaural parameters like interaural transfer function (ITF), interaural phase difference (IPD), interaural time difference (ITD) and interaural coherence (IC) for the given input signals. The ITD is calculated by dividing the IPD by the instantaneous frequency of the signal. In addition lowpassed filtered version of the interaural parameters are calculated (ending with _lp) to simulate a finite time resolution of the binaural system.
The output structure outp contains the following fields:
| 'itf' | transfer function |
| 'ipd' | phase difference in rad |
| 'itd' | interaural time difference based on instantaneous frequency |
| 'itd_C' | interaural time difference based on center frequency |
| 'f_inst_1' | instantaneous frequencies of left ear signal |
| 'f_inst_2' | instantaneous frequencies of right ear canal signal |
| 'f_inst' | instantaneous frequencies (average of f_inst1 and 2) |
| 'ic' | interaural coherence |
| 'rms' | rms value of frequency channels for weighting |
| 'ild_lp' | based on low passed-filtered insig, level difference in dB |
| 'ipd_lp' | based on lowpass-filtered itf, phase difference in rad |
| 'itd_lp' | based on lowpass-filtered itf, interaural time difference |
| 'itd_C_lp' | based on lowpass-filtered itf, interaural time difference |
The _lp values are not returned if the nolowpass flag is set.
dietz2011_interauralfunctions accepts the following optional parameters:
| 'compression_power',cpwr | |
| Applied compression of the signal on the cochlea with ^compression_power. The default value is 0.4. | |
| 'tau_cycles',tau_cycles | |
| Temporal resolution of binaural processor in terms of cycles per frequency channel. The default value is 5. | |
| 'signal_level_dB_SPL',signal_level | |
| Sound pressure level of left channel. Used for data display and analysis. Default value is 70. | |
| 'lowpass' | Calculate the interaural parameters of the lowpassed signal/ITF (_lp return values). This is the default. |
| 'nolowpass' | Don't calculate the lowpass based interaural parameters. The _lp values are not returned. |
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 ]
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