Abstract
Phantom sources are known to be perceived similar to real sound sources
but with some differences. One of the differences is an increase of the
perceived source width. This article discusses the perception,
measurement, and modeling of source width for frontal phantom sources with
different symmetrical arrangements of up to three active loudspeakers. The
perceived source width is evaluated on the basis of a listening test. The
test results are compared to technical measures that are applied in room
acoustics: the inter-aural cross correlation coefficient (IACC) and the
lateral energy fraction (LF). Adaptation of the latter measure makes it
possible to predict the results by considering simultaneous sound
incidence. Finally, a simple model is presented for the prediction of the
perceived source width that does not require acoustic measurements as it
is solely based on the loudspeaker directions and gains.
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