Temporal change in interaural cross‐correlation functions due to signal dynamics

Maximal values of transient interaural cross‐correlation functions (TRICC) for simple burst signals were used earlier to analyze temporal changes in spatial impressions such as sound image localization and subjective diffuseness. These temporal changes were found to correspond with subjective experiences [Yanagawa et al., J. Acoust. Soc. Am. 84, 1728–1733 (1988)], for the present study, a sound signal was chosen that is closer to transient sources such as music or voice. It consists of two bursts of white noise with a silent pause inbetween that is shorter than the reverberation time of the room. TRICC values at the rise of the second white noise signal were analyzed to see how they changed with the length of the pause and with room volume. It was found that a shorter pause causes the fall (reverberation) of the initial sound burst to overlap the second, so that TRICC values are smaller, but less so when the room is smaller. These results clarify how temporal changes in TRICC closely reflect differences in rooms with regard to ease of sound image localization.