摘要
通过扬声器的覆盖角来近似测量扬声器的指向性指数,是一个比较实用、简便、有效的方法。从其关系式的近似推导来看,假定了被测声源的声能量近似集中在由两个互相垂直平面内的覆盖角∠A和∠B所确定的立体角Ω内,且用Ω内的平均声压代替了参考轴向的声压,故扬声器的覆盖角与指向性指数的近似关系式在实际使用中具有一定的偏差。
An approximate measure of the loudspeaker directivity index by loudspeaker coverage angle is a practical, simple and effective approach. From the approximate relationship perspective, it is assumed the measured acoustic energy of the sound source focused approximately by two mutually perpendicular plane coverage angle LA and LB determinate in the solid angle and used in ~ of the average sound pressure instead of the sound pressure of reference axis. Therefore ,the approximate rela- tionship between loudspeaker coverage angle and directivity index have certain deviation in practice.
出处
《电声技术》
2014年第1期29-31,共3页
Audio Engineering
关键词
指向性指数
覆盖角
偏差
directivity index
coverage angle
deviation
