Apparatus for increasing directivity of a sound source

Details Apparatus for increasing directivity of a sound source Apparatus for increasing directivity of a sound source

1982-08-30

1984-07-17

Hix, L. T.

Acoustics

Sound-modifying means

G10K 1100

Patent

active

044600615

ABSTRACT:
Directivity of a sound source is significantly increased when the source is positioned within the geometrical center of a ring having a diameter and height of 1 wavelength and 1/2 wavelength respectively. Sound energy radiates to the ring and is re-radiated or diffracted at the top and bottom thereof. The re-radiated or diffracted sound energy thus appears to be generated by two simple sources, in phase and vertically arranged, one source being at the top of the ring and the other at its bottom, resulting in increased intensity along the horizontal plane bisecting the sources. The two phased sources at the top and bottom of the ring may be considered to be located along any imaginary vertical plane through the single source. Sound intensity in a desired plane or direction is thus increased without a concomitant increase in power, number of sources or components.

REFERENCES:
patent: 2457527 (1948-12-01), Bruce
patent: 2480199 (1949-08-01), Rosenberg et al.
patent: 3007133 (1961-10-01), Padberg, Jr.
patent: 3483945 (1969-12-01), Michael
patent: 4314098 (1982-02-01), Maerfeld
patent: 4322578 (1982-03-01), Selmin

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