The main differences between radiation angle and coverage angle are given, and the loudspeak′s directivity index is measured by two methods.
笔者对这些变化进行了解读,强调"辐射角"和"覆盖角"的区别,并用2种方法测量了扬声器指向性指数,从而说明新版标准中给出的用覆盖角计算指向性指数的方法简便易用。
The definition of directivity factor,directivity index & equation are introduced firstly.
介绍了指向性因数和指向性指数的定义、计算式。
The directivity function is used to describe the sound field of single-frequency and broad-band waves produced by a medical linear array.
用指向性函数分别描述了医用线列阵单频波和宽带波声场。
The directivity function of the sound source was derived applying the directive theory of multiplex system.
为获得强指向性声源,设计了圆形活塞圆周阵组合声源,根据复合系统的指向性理论推导出声源远场的指向性函数。
The sound field of the Continuous Wave and the Impulsive Wave is described by the directivity function.
论述了有关全数字化B超中超声波的辐射声场及相应的计算方法 ,通过引入指向性函数分别描述了连续波和脉冲波的声场 。
Started with the directivity coefficients,the principles of XY arrays and MS arrays simply are introduced.
从传声器指向性系数的角度入手,简单介绍了XY制式和MS制式的拾音原理,提出了XY制式与MS制式等效转换的一种计算方法,并对其进行了讨论。