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1. 发明授权

US5321388A High efficiency phase and amplitude matched multiple horn electronic siren 失效
标题翻译：高效相位和振幅匹配多喇叭电子警报器
公开(公告)号：US5321388A
公开(公告)日：1994-06-14
申请号：US851915
申请日：1992-03-16
申请人： James E. Biersach
发明人： James E. Biersach
IPC分类号： G10K11/02 , G08B3/00
CPC分类号： G10K11/025
摘要： An electronic siren apparatus has a primary horn with a throat which splits into matched secondary horns each having sides, an output end, a longitudinal axis, and a circumference. The secondary horns are folded back toward and around the primary horn and throat and the portions of the circumference of each end are joined. The folded secondary horns and the joined portions form a cavity which houses the primary horn and throat. A driver is operatively joined with the throat and is contained within the cavity for generating sound which is transmitted through the throat and primary horn, and then into each secondary horn and out the output ends in phase and amplitude matched relation. The area of the primary horn and the combined areas of the secondary horn, satisfy the equation ##EQU1## where x is the distance measured along the axis from the throat, cosh is the hyperbolic cosine function, d is the diameter of the primary horn and the combined diameters of the secondary horns, d.sub.T is the diameter of the throat, and x.sub.0 is determined by the equation ##EQU2## where f.sub.c is the cutoff frequency and c is the speed of a free sound wave front.
摘要翻译：电子警报装置具有主喉部，其具有分开成具有侧面，输出端，纵向轴线和圆周的匹配的次级喇叭的喉部。次级喇叭朝着主喇叭和喉咙向周围折回，并且每端的圆周部分被连接起来。折叠的次级喇叭和连接部分形成容纳主喇叭和喉部的空腔。驱动器与喉部可操作地连接并且被包含在腔内，用于产生通过喉部和主喇叭传播的声音，然后进入每个次级喇叭，并以相位和幅度匹配关系输出输出端。主喇叭的面积和二次喇叭的组合面积满足公式，其中x是从喉部沿轴测得的距离，cosh是双曲余弦函数，d是主喇叭的直径，次级角的组合直径dT是喉部的直径，x0由等式确定，其中fc是截止频率，c是自由声波前的速度。

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