Abstract
A previous paper [M. Morimoto and K. Iida, J. Acoust. Soc. Am. 93, 2282 (1993)] indicated that the listener envelopment (LEV) grows as the energy of reflections coming from the back of the listener increases. This paper investigates which is more effective for LEV, the F/B ratio of early or late reflections. In the experiments, a music motif is used as a source signal. The F/B ratios in the early and late reflections are changed independently, but the C value, the degree of interaural cross correlation, and the sound-pressure level of all sound fields are kept constant. The experiments were performed by using a paired comparison test. The task of the subjects was to judge which sound field had higher LEV. The experimental results indicate that the F/B ratio of both of the early and late reflections have an effect on LEV but that the latter is a little more effective for LEV than the former. This result suggests a relation between the perception of LEV and the law of the first wavefront.
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