Apparent Source Width (ASW) of Complex Noises in Relation to the Interaural Cross-correlation Function
Shin-ichi Sato and Yoichi Ando

This study examined the apparent source width (ASW) of complex signals, which includes bandpass noises whose center frequencies are the harmonics of the fundamental frequency (i.e., complex noises). The fundamental frequencies used in the experiment are below 800 Hz so that the perceived pitch of noises corresponds to the fundamental frequency. The lowest center frequencies of the components of the stimuli are 1600 Hz. The scale values of ASW of the complex noises were obtained by paired-comparison tests. The test results show that the ASW is judged from the frequency component of the source signal because the ASW can be calculated by the width of the interaural cross-correlation function, W_IACC, which is defined as the interval of delay time at a value of 10% below the IACC.

Key words: apparent source width (ASW), interaural cross-correlation function, complex noise