A CONVERGENCE THEOREM ON A KIND OF BAND-LIMITED FUNCTIONS WITH APPLICATIONS

A theorem on the convergence of a particular sequence of bandlimited functions is proved.Asits applications,the convergence of a speed up error energy reduction algorithm for extrapolatingbandlimited functions in noiseless cases and the convergence of an iterative algorithm to obtainestimations of bandlimited functions in noise cases are derived.Both algorithms are the improvedversions of the Papoulis-Gercheberg algorithm.     

Colorimetric characterization of liquid crystal display using an improved two-stage model

An improved two-stage model of colorimetric characterization for liquid crystal display (LCD) was proposed. The model included an S-shape nonlinear function with four coefficients for each channel to fit the Tone reproduction curve (TRC), and a linear transfer matrix with black-level correction. To compare with the simple model (SM), gam-offset-gain (GOG), S-curve and three-one-dimensional look-up tables (3-1D LUTs) models, an identical LCD was characterized and the color differences were calculated and summarized using the set of 7×7×7 digital-to-analog converter (DAC) triplets as test data. The experimental results showed that the model was outperformed in comparison with the GOG and SM ones, and near to that of the S-curve model and 3-1D LUTs method.     

录像机录制爆音的剖析

录像机录制爆音的剖析西安电子科技大学石武信，楼志源人们用录像机播放录像节目时，常有这样的体会，就是当节目中的人物开口说话时声音起始突然脉冲似的很大，然后平稳，并在声音的停止期伴有不可容忍的噪声，这种现象由于是录制过程中产生的，因此我们称其为“录制爆音...     

ICP—AES法中一种循环雾化系统及其性能的研究

本文介绍了一种外部型，旋流雾化室，带清洗器的循环雾化系统，并对其连续稳定的雾化时间，雾化效率，稳定性，记忆效应等性能进行了研究。     

软件测试与质量保证

软件测试是在软件投入运行前对软件的需求分析、设计规格说明和编码的最终复审，是软件质量保证的关键步骤。在软件测试过程中记载出错数据，进行可靠性分析，以控制软件的质量是至关重要的。介绍了软件测试的基础知识、软件质量保证的内容以及两者间的关系。     

光折晶体Fe:LiNbO_3中的光致散射效应

本文给出了光折晶体中光致散射理论,并用Fe:LiNbO_3晶体以氩离子激光为光源研究了光致散射效应,得到了透射光强度随照射时间变化的动态曲线及与理论一致的散射光强随散射角变化的实验曲线.实验中还观察到表面复合效应,提供了简便地消除此效应的方法.     

新型光链路设计在HFC网络中的应用

以往的有线电视HFC光链路设计中,一般的步骤是由下而上,这种设计可以让光发射机的光功率得到最大利用,但缺点也很明显.而采用新型的由上而下的设计:先选定光发射机和光分路器,再计算出各光分路器的传输距离,再将距离相近且地理位置相近的光点接到同一个光分路器,有利于维护和管理,扩展更容易,可组成N 1冗余备份.     

双栅MOSFET的物理模型

双栅MOSFET是近年来发展起来的很有前途的新器件.由于它具有频率高、增益可控、低噪声和低反馈电容等优点,所以广泛的用于甚高频和超高频电路中.例如,放大器、振荡器、混频器、调制和解调器等.