查询词典 band filter

Four half band filter decimation modules are designed which can cascade connected to implement 2K decimator.

设计和实现多个半带滤波器抽取模块，组合成多级抽取器实现2~K倍抽取。

So it adapts to be applied to the software radio. In this system, the received IF signal is to be digital down converted, and then is to be processed through the base band filter.

本系统首先对收到的中频数字信号进行数字下变频，并进行基带滤波，得到两路正交信号I、Q。

This character of the photonic crystal containing defect can be used to enhance spontaneous emission of atoms and to make narrow band filter.

光子晶体缺陷的这一性质具有很重要的实际用途，如增强原子的自发辐射、制作极窄带的选频滤波器等。

The principle of optical fiber homochromous radiation temperature measurement was described. The mathematical model was created. Aiming at the problem of temperature measurement in bad working environment , quartz optical fiber and narrow band filter were used to design a temperature measurement system in real time based on virtual instrument. Principle and method of the system ,structure of hardware and software were expounded. The methods of data acquisition and data analysis on virtual instruments platformwere explained. Single2chip hardware system and LabVIEW software were adopted to ensure the precision and stability , data storing and long2range display was realized.

介绍了光纤单色辐射式测温原理，建立了测温系统数学模型，针对恶劣环境下的温度测量问题，利用石英光纤束和窄带滤光片，设计了基于虚拟仪器技术的实时测温系统，阐述了系统工作原理和实现方法，以及系统的硬件和软件结构，说明了在虚拟仪器开发平台上进行数据采集与数据分析的实现方法，采用单片机硬件系统和LabVIEW软件系统以保证测量精度和稳定性，并实现了数据的存储和远程显示。

To meet the needs, a novel low-noise fiber laser with compound cavity structure is designed. The stable single-mode operation is realized by using a transient self-written fiber grating, produced by the effect of saturable absorption within a section of unpumped erbium-doped fiber, as narrow band filter for mode selecting and linewidth squeezing. Through optical path modification, the spectral signal-to-noise ratio is better than 62 dB.

激光器采用复合腔结构，以掺铒光纤作为工作物质，通过在未被抽运的掺铒光纤中形成的瞬态自写入光纤光栅的窄带滤波特性进行选模和压窄线宽，产生稳定的单频激光输出；经过光路改进，激光输出光谱信噪比优于62 dB；利用光电负反馈电路，弛豫振荡峰下降了约25 dB，低频段强度噪声也大为改善，有效地抑制了光源的强度噪声。

In order to improve traditional double talk detection algorithm easily leads to misjudging when near-end speech signal amplitude is low, this paper proposes an improved algorithm on double talk detection based on sub-band filter banks.

针对传统双讲检测算法在近端语音幅度较低情况下容易产生误判的情况，给出一种基于子带滤波器组的改进双讲检测算法。

Design and analysis of dual～band filter.

双通带带通滤波器的分析与设计。

By optimizing the parameter of the device,a narrow band filter with a 0.4nm bandwidth is obtained.

但在DWDM网络中，由于信息对波长的依赖，滤波器的作用却无处不在[1]。

At last, a 31 GHz narrow band filter is designed as an application of the photonic crystal.

利用CST对设计的腔体式滤波器仿真，结果比较理想。

If the thickness of the colored glass and the band width of the narrow-band filter now on hand is encreased properly, fine signal-to-noise ratio and resolving capability of fluorescence imaging can be obtained.

根据有色玻璃的吸收特性，实验时适当增加光在玻璃中的行程和带宽，使信号和背景光的透过率之比增大，从而得到较好的荧光像的信噪比和分辨本领，提高了图像目视探测的灵敏度。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了