Interaural Cross-Correlation Coefficient

IACC_A

The measure of the difference in the sounds arriving at the two ears of a listener facing the performing entity in a hall. IACC is usually measured by recording on a digital tape recorder the outputs of two tiny microphones located at the entrances to the ear canals of a person or a dummy head, and quantifying the two ear differences with a computer program. IACCA is determined with a frequency bandwidth of about 100 to 8000 Hz and for a time period of 0 to about 1 second. No frequency weighting is used.

IACC_E3

The interaural cross-correlation coefficient determined for a time period of 0 to 80 milliseconds. It is the average of the values measured in the three octave bands with mid-frequencies of 500, 1000 and 2000 Hz. It has been shown to be a sensitive measure for determining the apparent source width (ASW) of a performing entity as heard by a person seated in the audience.

IACC_L3

The interaural cross-correlation coefficient determined by averaging the values in the 500, 1000 and 2000 Hz bands, for a time period of 80 to 750 milliseconds. It correlates approximately to the state of sound diffusion in a concert hall.

See also: Duplex Theory of Localization, Head Related Transfer Function, Hearing, Interaural Fluctuation Strength, Interaural Phase Difference, Localization Accuracy.