Interaural time differences (itdProc.m
)¶
The ITD between the left and the right ear signal is estimated for individual
frequency channels and time frames by locating the time lag that corresponds to
the most prominent peak in the normalised CCF. This estimation is further
refined by a parabolic interpolation stage [May2011], [May2013b]. The ITD
processor does not have any adjustable parameters, but it relies on the CCF
described in Cross-correlation (crosscorrelationProc.m) and its corresponding parameters (see
Table 32). The ITD representation is computed by using
the request entry ’itd’
.
The ITD processor is demonstrated by the script DEMO_ITD.m
, which produces
two plots as shown in Fig. 38. The ear signals for a speech source
that is located closer to the right ear are shown in the left panel. The
corresponding ITD estimation is presented for each individual TF unit (right
panel). Apart from a few estimation errors, the estimated ITD between both
ears is in the range of 0.5 ms for the majority of TF units.
[May2011] | May, T., van de Par, S., and Kohlrausch, A. (2011), “A probabilistic model for robust localization based on a binaural auditory front-end,” IEEE Transactions on Audio, Speech, and Language Processing 19(1), pp. 1–13. |
[May2013b] | May, T., van de Par, S., and Kohlrausch, A. (2013), “Binaural Localization and Detection of Speakers in Complex Acoustic Scenes,” in The technology of binaural listening, edited by J. Blauert, Springer, Berlin–Heidelberg–New York NY, chap. 15, pp. 397–425. |