1) directivity function
![点击朗读](/dictall/images/read.gif)
指向性函数
1.
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。
2.
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。
3.
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 。
2) directivity index
![点击朗读](/dictall/images/read.gif)
指向性指数
1.
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。
2.
The definition of directivity factor,directivity index & equation are introduced firstly.
![点击朗读](/dictall/images/read.gif)
介绍了指向性因数和指向性指数的定义、计算式。
3) directivity function
![点击朗读](/dictall/images/read.gif)
方向性函数
1.
Analyzes the micro strip antenna from Several important aspects of TV receiving antenna-directivity function and so on, and demonstrates synthetically the feasibility of micro strip antenna as the vehicle carried sat- ellite TV receiving antenna.
从方向性函数等电视接收天线的几个重要方面对微带天线进行了理论分析,并对其作为车载卫星电视接收天线进行了可行性的综合论证。
4) the character of exponential function
![点击朗读](/dictall/images/read.gif)
指数函数性质
5) pointer to function
![点击朗读](/dictall/images/read.gif)
指向函数的指示字
6) directivity coefficient
![点击朗读](/dictall/images/read.gif)
指向性系数
1.
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。
补充资料:指向性图案
指向性图案
超声学术语。换能器在固定频率工作时,通过声中心的指定平面内,其响应作为发射或入射声波方向的函数,称为指向性函数。用线图表示的指向性函数,称为指向性图。指向性函数是声源的远场声束图的数学描述,是极坐标中方位角和俯仰角的函数。同一换能器在不同频率下工作,其指向性将随频率的提高而趋明显。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条