指向性

The directivity responses of the speaker with and without the reflector are compared in simulation and verified with measurement.

文章模拟比较了扬声器加与不加反射器的指向性响应，并在消声室里进行实验验证。

In this paper, a closed chamber technique for measuring thecomplex free field sensitivity and directivity patterns of line array is described.

本文提出了一种在密闭管中测量线阵的自由场复数灵敏度和指向性图的方法。

Directivity requirement of sound picking system can be realized by using an acoustics structure or a microphone array.

传声器系统指向性的实现主要有两种途径：一是通过特殊的声结构，二是通过传声器阵列。

The directivity of emitter by changing the number and relative location of ultrasonic transducers are simulated.

通过改变换能器数目及之间的相对距离，模拟了超声发射阵的空间指向性。

By the nonlinearity of the propagation medium-air, the audible sound with high directivity can be produced.

利用超声波在空气中传播的非线性交互作用，可以产生高指向性的可听声音。

MD-12 is a solid high-power frequency of the two systems, there is a strong 12-inch low frequency driver and a 1-inch high frequency compression driver mounted on a continuous point of 80 degrees on X50 degree horn.

MD-12是一个高功率的坚固的二分频系统，有一个强劲的12英寸低频驱动器和一个1英寸高频压缩驱动器安装在一个持续指向性80度X50度号角上。

Inverse Compositional Gradient algorithm is a novel Inverse Compositional Image Alignment algorithm based on the local orientation.

反向合成梯度算法是一种基于局部指向性的反向合成图像对齐算法。

A sample numerical design method for constant beamwidth beamformer is given. This method is easy to implement and has no restriction on array geometry and sensor patterns; Three methods for the design of broadband frequency invariant beamformer are proposed, which are the method of resampling signals received by the array, the DFT interpolation method and adaptive synthesis method, respectively. Examples and performance analyses are given for each method; A simplified linear constrained minimum variance broadband adaptive algorithm that based on DFT interpolation method is presented. Compared with conventional broadband adaptive algorithms, the presented method can reduce computation work greatly.

提出了一种简单、易于实现的恒定束宽波束形成器设计方法，该方法对阵形和阵元指向性没有任何限制；分别提出了基于阵列接收数据重采样、基于DFT插值和自适应综合的三种具有频率不变波束图的宽带波束形成器设计方法，对于每一种设计方法都给出了一个设计实例并做了性能分析；提出一种基于DFT插值的简化线性约束最小方差宽带自适应阵列算法，该方法可以大大降低自适应阵列的运算量。

Study on near-field properties of ring plunger.

研究了单个圆环的近声场指向性。

At the same value of frequency and size, the directivity of quadrate ring piston is sharper than that of quadrate piston.

在同一声波频率以及相同尺寸的情况下，方环活塞声源要比方形活塞声源的远场指向性更尖锐。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。