Figure 6.

Pitch contour of speech signals before and after application of the PURR‐filter. The upper image illustrates the pitch contour of a normal sentence. Peaks and valleys of pitch contour symbolize typical sentence intonation. The lower image shows pitch contour for the same delexicalized sentence suggesting that the filtering procedure does not change the intonation contour. Duration of the delexicalized sentence is shorter as compared to the normal sentence because the aperiodic portions of the speech signal are removed.