central frequency

Bandwidth and central frequency are two key factors to it 's quality .

带宽和中心频率是射频噪声干扰品质的决定因素。

The Design of An AO Device Whose Central Frequency Is 300 MHz

中心频率为300MHz声光器件的设计

Central Frequency of Main Clutter Accuracy Tracking for Airborne Fire Control Radar System

机载火控雷达主杂波精跟踪

Central Frequency Adjustable High Q Value Micromechanical Band Pass Filter

一种中心频率可调节的高Q值微机械带通滤波器初探

Then three methods for estimation of Doppler central frequency f_D are presented .

重点阐述了多普勒中心频率fD的3种估计方法，并通过编程予以实现。

Clutter central frequency and bandwidth estimation methods

杂波谱中心和谱宽估计方法

This tracking filter is based on state variable filter and make central frequency be equal to control frequency .

这种跟踪滤波器以状态变量滤波器为基础，通过锁相倍频器和开关电容实现滤波器的中心频率与控制频率相等。

In the vicinity of central frequency the phase shifts are linearly related to frequency .

在中心频率附近反射相移和透射相移都与频率成线性关系。

It can also modulate the laser intensity by acoustooptic effect , and control the central frequency of the device .

也可以用声光效应实现激光强度的调制，而用电光效应来控制器件的中心频率。

Influence of Electrodes on the Central Frequency of HBARs

电极对高次谐波体声波谐振器中心频率的影响

The theoretical study shows that the central frequency is linear with the square of the voltage applied on the Wheatstone bridge .

理论研究表明：中心频率与电桥电压的平方成线性关系；

The pulses of rotate speed , reference of phase and tracking central frequency of filters are provided by reference circuit .

不平衡信号处理部分由基准信号电路和振动信号电路组成。基准信号电路用于测量转速、为测量相位提供基准以及为带通滤波器的中心频率提供跟踪脉冲。

The transformation of the formant central frequency and bandwidth is the main causation cause the Helium speech .

结论表明，语音共振峰中心频率和带宽的变化是引起氦语音现象的主要原因。

Its central frequency is 10 MHz , the biggest Q is 99.6.The powder core has application value in higher frequency field .

磁粉芯的中心频率为10MHz，其最大Q值为99.6。这种材料在高频范围内具有应用价值。

Implemented in 0.18 μ m CMOS technology , the circuit has a central frequency of 3.8 GHz with a 1.8 V supply voltage .

该电路的中心频率为3.8GHz，电源电压为1.8V，采用0.18μMCMOS工艺制作。

The key technique of this new filter is how to achieve the extreme narrow band-pass width and a slight deviation of central frequency .

如何实现极窄的通带宽度和极小的中心频率偏差是研制中所解决的关键技术问题。

Estimation of Doppler central frequency has an important effect to accuracy of fixed position in the fixing approach with no reference points for ocean SAR .

在无参考点海洋SAR定位方法中，多普勒中心频率估计对定位精度有着重要的影响。

Simulation results demonstrate that when SNR is high and spread angle is not big , the central frequency algorithm and the median algorithm are almost identical ;

仿真结果表明，在高信噪比和分布角不大时，中频法和中值法的性能几利相同；

This circuit include DDS which generate central frequency , five pair of low pass filter , 20 multipliers , and an adder .

该电路包括了用DDS产生的中心频率发生器、5对低通滤波器、20个乘法器和一个加法器。

The method which combines cross correlation detection with chaos theory to detect the weak signals relative to central frequency in overvoltage monitoring is proposed in the paper .

提出将互相关检测和混沌理论相结合应用于过电压监测中的频率跟踪，检测相对于中心频率极小的微弱信号。

When absorption is included , the transmission at the central frequency disappears , but the transmission still exists near the tail of the transmission band .

当吸收存在时透射带中心的透射峰消失，但带尾的透射峰依然存在。

The phase balance of the central frequency can ensure the accuracy of the correlation phase , and the residual phase error will only reduce the coherency .

实现信道中心频率的相位精度就可以保证干涉相位的精度，而通道内的残余相位差只会引起干涉相关度的降低。

The quality factor at the central frequency is higher , and increasing defect layer thickness and the number of period can enhance the quality factor of the defect mode .

处于中心频率处的缺陷模具有较高的品质因子，增大缺陷层厚度和布拉格镜周期数可提高缺陷模的品质因子。

In radar signal processing systems , the central frequency and bandwidth of clutter must be accurately estimated to suppress clutter and prevent target whitening .

在雷达动目标检测等处理中，为了有效抑制杂波，并防止目标白化，首先需要对杂波谱中心和谱宽进行有效的估计。

By applying the recursive least square method , realtime structure modal parameters of missiles are identified and utilized to update the central frequency of structure filter .

采用递归最小二乘算法，在线辨识飞行器的结构模态参数并用于实时更新滤波器的中心频率。

Its central frequency is 129 MHz and total diffraction efficiency higher than 50 % ( 6328 A ) at a driving voltage of 3 volts .

器件中心频率129MHz，总衍射效率大于50%（6328（？），驱动电压3V）。

At the same time , the authors also studied the spectral distribution of the pulse at different spacial locations , and there are new frequencies around the central frequency .

同时，还研究了同一脉冲不同横向空间位置处的超连续谱的变化规律，在中心频率两侧均有新频率产生。

Moreover , a TM01 & TE11 mode converter with the central frequency of 3.6 GHz is designed and simulated .

设计了同轴插板式TM01&TE11模式转换器，并对其进行了详细的数值仿真和实验研究。

Our results show that population inversion is obtained in a wider central frequency range than for the coherent field case , and it is more advantageous in practical applications .

我们的研究表明，对于部分相干光，可在比相干光更宽的中心频率范围内建立布居反转，这正是实用上更有利的。

The effect of Signal-Noise-Ration ( SNR ) to the estimation of Doppler central frequency has been studied using theoretical method and simulation technique , and results are given in curves .

该文从理论和仿真两个角度研究了信噪比对多普勒中心频率估计的影响，给出了多普勒中心频率和信噪比的理论及仿真关系曲线。