Effect of transient signal length on cross‐correlation functions in a room

Abstract

An investigation was made of cross‐correlation functions with transient signals between two points, which correspond to both ears of a listener in a room. The interaural cross correlation is closely related to the subjective impressions of sound fields. The study attempted to account in a comprehensive way for the combined effects that initial reflected and reverberation sounds from music or other transient signals have on such impressions. To this end, cross‐correlation functions of the rise and fall of the sound field from transient signals were derived from the impulse responses at two points in the hall. These results were combined with image‐sources distribution patterns derived by the closely located four‐point‐microphone method; then, a comparative explanation was made of the changes with transient time duration of the cross‐correlation functions. Good agreement was found between changes with time in experimentally derived maximal cross‐correlation function values and the changes with time in image‐sources distribution of the sound field.