Interaural level differences (
The ILD is estimated for individual frequency channels by comparing the
frame-based energy of the left and the right-ear IHC representations. The
temporal resolution can be controlled by the frame size
ild_wSizeSec and the
ild_hSizeSec. Moreover, the window shape can be adjusted by the
ild_wname. The resulting ILD is expressed in dB and negative
values indicate a sound source positioned at the left-hand side, whereas a
positive ILD corresponds to a source located at the right-hand side. A full
list of parameters is shown in Table 33.
||Window duration in s|
||Window step size in s|
The ILD processor is demonstrated by the script
DEMO_ILD.m and the
resulting plots are presented in Fig. 40. The ear signals are shown
for a speech source that is more closely located to the right ear (left panel).
The corresponding ILD estimates are presented for individual TF units. It
is apparent that the change considerably as a function of the centre frequency.
Whereas hardly any ILDs are observed for low frequencies, a strong influence
can be seen at higher frequencies where ILDs can be as high as 30 dB.