查询词典 frequency band

Simulation results show that, for the fixed sampling frequency, the error rises with the frequency increasing of periodic signal, and decreases with the attenuation time constant increasing of non-periodic signal. The sampling frequency determines the upper limit of appropriate frequency band directly. The research provides the basis for the selection of cutoff frequency in filter design.

仿真结果表明，在采样频率确定时，对于周期信号，计算误差随频率的增加而增大，而对于非周期信号，计算误差随衰减时间常数的增大而减小，采样频率大小决定了插值法用于分布参数模型的适用频带上限，该研究为滤波器设计中截止频率的选择提供了依据。

Diode switches or voltage controlled varactors implement dual-band resonators such that they can offer low impedance at the second harmonic of each frequency band, while, in some cases, presenting high impedance at the fundamental frequency as an RF choke circuit.

利用二极体开关或电压控制变容器实施双频共振器以提供在双频操作中每一个频段之二阶谐波的低阻抗，同时在一些实施例里也提供主频段的高阻抗、具有射频阻塞电路作用。

Meanwhile, the high master frequency band signal acquisition channel makes full use of the cymoscope sensitivity and hardware dynamic range, has larger analog signals front-located gain, thereby reinforcing the signal-noise ratio of the high master frequency band signal, and bringing along benefits for the later stage high resolutions seismic data process.

同时由于高主频频带信号采集电路充分利用了检波器的灵敏度和硬件动态范围，具有较大的模拟信号前置增益，使得高主频频带信号的信噪比得到增强，为后期高分辨率地震资料处理带来了较大益处。

The mulitresolution analysis of wavelet can decomposite signal on different Scales.So it has the ability of processing for signal in frequency-band,which is very useful to analysis the details of signal on a given frequency-band,to build up the identification features of signal and to cancel the signal noise.

小波多分辨率分解能够将信号在不同的尺度上展开，因而具有对信号按频带进行处理的能力，这对于分析特定频段上信号的细节，建立表征识别故障信号的特征以及清除信号的干扰与噪声等方面具有十分重要的意义。

Statistic analysis on IR image characteristics shows that IR target has relatively more and larger regions which are of same quality, mainly expressed by smooth images and by that the energy distribution is concentrated on low frequency band in L〓 linear normed space, while large quantity of background regions show as texture images and their energy in L〓 space is concentrated on high frequency band. Based on this difference, the IR target segmentation method on the basis wavelet transformation is proposed.

通过对红外图像特征的统计分析证明，红外目标含有较多较大的同质区，主要表现为平滑图像，在L〓线性赋范空间的能量分布集中在低频，而大量的背景区域表现为纹理图像，在L〓空间中能量集中在高频部分，根据这一差别，提出了一种基于小波变换的红外目标分割方法。

In order to detect load in tumbling box correctly,the frequency band that could reflect information of mill ball load was obtained from the vibration signal collected from ball mill bearing block.The signal was analyzed by energy method based on wavelet transform,from which the frequency band signal was picked out to show the corresponding coal level in tumbling box.

为了更准确地检测料位，对球磨机轴承座振动加速度信号进行采集，从振动信号中提取了反映料位信息的特征频段，利用小波分析技术对信号进行了能量分析，分离出反映滚筒内存煤量信息的信号，为实现球磨机料位的自动控制提供了理论依据。

Around the frequency band setting and standardization problem for RFID, argument has been continuing, and government can't make conclusion, Until April 20th 2007, Information Industry Ministry can't voice the trial band In ultra high frequency.

摘 要：围绕着对RFID的UHF频段的开放和标准的制定问题，国内争执不休，政府主管部门长期久议不决，直到2007年4月20日，信息产业部才发布了频段评断试用的通知书。

Zhang Qi pointed out that the RFID application has the different frequency band, low frequency, high frequency and ultra-high frequency, at present will speak the high frequency application was still the market mainstream, in the short-term will not change, in 2008 the high frequency application occupied 70% market share, from now on will keep pace with the times unceasingly carries on the development.

张琪指出，RFID应用有不同频段，低频、高频和超高频，目前来讲高频应用仍是市场主流，短期内不会改变，2008年高频应用占70%的市场份额，今后会不断与时俱进地进行发展。

With the development and application of three-terminal devices, a millimeter-wave three-terminal device oscillator has some advantages over a two-terminal oscillator, for instance, operation frequency band, efficiency, stability and integrity. Especially, for PHEMT (pseudomorphic high electron-mobility transistors) oscillator and HBT (heterojunction biplor transistors) oscillator, there is lower noise and better integrity, operate in wider dynamic range and higher frequency band.

随着三端器件的发展，相对于毫米波二端器件振荡器而言，毫米波三端器件振荡器具有工作频带宽、效率高、工作稳定和集成度好等优点，特别是用PHEMT和HBT器件制作的振荡器，具有更低的噪声，更大的动态范围，更好的集成度，可以工作在更高的频段，所以固态器件毫米波振荡器已逐步向三端器件振荡器发展。

A mixed sensitivity H∞ control model is constructed and the band width of wind turbine speed control is designed according to the frequency characteristic of wind speed variation and noise of rotating speed sensor. The sensitivity function is decreased within this frequency band to restrain the wind torque perturbation to wind turbine rotating speed control.

通过构造基于复合灵敏度的H∞鲁棒控制模型，根据风速的波动频率范围和传感器的噪声频率范围设计了风车转速控制的带宽，并在此带宽内降低系统的灵敏度函数，来抑制风力转矩对风车转速控制的干扰。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。