Accession Number : AD0254774

Title :   UNIFORM DISTRIBUTIONS OF SOUND SOURCES ON THE SURFACE OF A RIGID SPHERE AND SOME APPLICATIONS

Corporate Author : CALIFORNIA INST OF TECH PASADENA

Personal Author(s) : HICKLING, ROBERT

Report Date : FEB 1961

Pagination or Media Count : 1

Abstract : A study is made of certain elementary source distributions on the surface of a rigid sphere for a fairly extensive range of frequencies. The elementary systems considered consist of a point source, uniformly vibrating caps and rings, and plane line sources. Results are given for typical cases of the far zone sound fields and acoustic impedances of caps and rings, and also for the far zone sound field of a particular plane line source. Combinations of the elementary rings and caps are examined with a view to producing desired directional patterns and the results for a particular directional beam are presented. Taking a sphere as a model for the human head, the results for a point source are used to examine possible mechanisms for the binaural localization of sources of sound. These results indicate that, due to non-linear variation of phase with frequency, a pulsed sound should appear in a somewhat different form at each ear. (Author)

Descriptors :   *ACOUSTIC IMPEDANCE, *ACOUSTICS, *SOUND, MATHEMATICAL ANALYSIS, PRESSURE, PROPAGATION, SOURCES, SPHERES, THEORY.

Distribution Statement : APPROVED FOR PUBLIC RELEASE