| 摘要 |
<p>A horn speaker capable of forming a uniform sound field of a high fidelity and uniform tone quality and clearness, regardless of the position of listeners, is suitable for use in broadcastings in a hall, station yard, playground and so forth. The horn speaker has a horn defined by four wall surfaces each defined by the equation: a - ao (1 + .alpha.x)n where ao represents half the cross-sectional width of the respective wall surface at the throat, a represents half the cross-sectional width of the respective wall surface at a distance x from the throat and .alpha. represents the divergence coefficient. n has a value n1 (n1 ? 2) at the open end side of the horn and a different value n2 (n2 > n1) at the throat side. In addition, the tangential angle at the open end of the horn is selected to fall between 1.50 and 2.00, where 0 represents half of the directivity angle, which is an angle causing a 6db drop of the sound pressure from the sound pressure on the axis of the polar directivity characteristics.</p> |
