最佳雷达信号和匹配滤波器

本文基于雷达信号和雷达模糊度函数间的一致关系,提出了任意平方可积的二维有界函数是雷达模糊度函数的充要条件,并且指出它包括了Wilcox提出的离散的可实现条件. 如果预给函数满足定理的充分条件时,模糊度函数的逼近就简化成相应的雷达信号的逼近了。如果适当地选择正交基,一种理想的雷达模糊度函数的综合是可以得到圆满的解决的。同时最佳雷达信号产生器和它的相应的匹配滤波器都能用Laguerre网络来构造。     

用梳状滤波器分离亮度信号和色度信号

在彩色电视机的质量方面,尤其是彩色清晰度方面,由于采用了勾边电路、SRPP未级视放输出电路、彩色信号瞬态改善电路等新型电路,使彩色电视图像的清晰度得到了一定程度的提高,但是还不太理想。具体表现为细节分辨力差,彩色图像质量只相当于16mm彩色电影的水平,同35mm彩色电影的水平     

信号滤波器的种类

信号滤波器按安装方式和外形分，有线路板安装滤波器、贯通滤波器和连接器滤波器等三种。     

光纤系统的全息近红外滤波器和信号分离器

二氧化硅单模光纤在1.2～1.6μm有低损耗的窗口。如果使不同波长的各种信号在光纤中传输(波长多路传输),系统的容量就是很大的。多路传输和信号分离能用几种方法实现。本文中我们实际演示了共形全息在这方面应用的潜力。在共形全息器件中,条纹走向近似平行于基片。因此它具有多层电介质堆的性质,但是由于各层折射率变化小的特性,因而能有很多层.这意味着这个堆在某一窄的频带范围内有很高的反射率。     

基于FIR滤波器的信号分解和合成技术

本文对基于FIR滤波器的信号分解和合成技术进行了研究,特别对其中的关键环节数据的扩展方法进行了深入分析,指出了传统方法中存在的问题,并在传统数据对称扩展方法的基础上给出了新方法。     

基于FIR滤波器的信号分解和合成技术

本文对基于ＦＩＲ滤波器的信号分解和合成技术进行了研究，特别对其中的关键环节数据的扩展方法进行了深入分析，指出了传统方法中存在的问题，并在数据对称扩展方法的基础上给出了新方法。     

数字电视信号接收滤波器的研制

本文介绍了应用网络综合法设计微波滤波器的基本原理和方法,并简要说明了设计制造应用于数字电视接收的六个同轴谐振腔的节目滤波器基本过程和基本调试方法,调试后的滤波器指标完全达到了实际需要。     

升压电源和高压DAC为天线和滤波器提供调谐信号

天线阵列和滤波器常常通过改变钛酸钡锶(BST)电容上的电压来进行调谐。将这种铁电材料应用于电容时,只需施加一个电压,即可导致其晶体结构发生细小的变化,从而改变其介电常数,电容值因而随之改变。相比于传统的变容二极管,电子可调     

视频滤波器简化信号调理设计

ADA441X系列视频滤波器包括ADA4410—6、ADA4411—3和ADA4412-3，其中包括可调节6极点滤波器和缓冲器，可调理高清晰度(HD)视频信号。ADA4410-6有6个通道来处理任何标准的视频信号：HD，SD，S—VIDEO或复合信号。ADA4410-6还包含每个输入端2：1复用器和可调整的失调以及可选择的增益功能。     

采用信号处理机的数字滤波器的设计和工程实现

本文评述了无限脉冲响应(IIR)和有限脉冲响应(FIR)数字滤波器的基本设计技术,重点放在推导IIR滤波器传递函数的各种模—数变换方法,以及设计FIR滤波器的窗口法和频率取样法。接着介绍了采用递归和非递归网络结构以硬件来实现滤波算法。采用Intel 2920信号处理机来说明数字滤波的四种基本操作(输入/输出,加法/减法,乘法和单位延时)的工程实现。最后还列出了其它类似处理机的主要特性。     

Linear Signal Processing by Acoustic Surface-Wave Transversal Filters

The impulse response of acoustic surface-wave (ASW) filters is determined by the configuration of an array of planar transducers tapping the acoustic signal propagated in the piezoelectric substrate. The transducer configuration is derived here by applying the generaI procedure used for the synthesis of linear transversal filters, which consists in time sampling the required impulse response and arranging the spacing and weights of the taps according to the time intervals and amplitudes of the impulse-response samples. The design of the tapping structure that synthesizes the impulse response of ASW transversal filters is based on a nonuniform sampling procedure, previously developed by the authors, that meets the particular requirements of ASW device operation. The features of this design procedure are presented, and several geometries of tapping transducers corresponding to impulse responses of different characteristics are discussed. The application of the procedure to the design of typical ASW filters is illustrated by the results of experimental models.     

Two-Dimensional Filters for Signal Processing under Modeling Uncertainties

Matched and Wiener filters are considered for signal processing applications when the a priori information about signal and noise characteristics is not completely specified. The approach is to design filters which are saddle-point or max-min solutions for the criterion functional (mean-square-error or signal-to-noise ratio) over the classes of allowable signal shapes and signal and noise spectral densities. Two-dimensional discrete-parameter processes are considered, and a numerical example is presented.     

Digital Filters for Real-Time ECG Signal Processing Using Microprocessors

Traditionally, analog circuits have been used for signal conditioning of electrocardiograms. As an alternative, algorithms implemented as programs on microprocessors can do similar filtering tasks. Also, digital filter algorithms can perform processes that are difficult or impossible using analog techniques. Presented here are a set of real-time digital filters each implemented as a subroutine. By calling these subroutines in an appropriate sequence, a user can cascade filters together to implement a desired filtering task on a single microprocessor. Included are an adaptive 60-Hz interference filter, two low-pass filters, a high-pass filter for eliminating dc offset in an ECG, an ECG data reduction algorithm, band-pass filters for use in QRS detection, and a derivative-based QRS detection algorithm. These filters achieve real-time speeds by requiring only integer arithmetic. They can be implemented on a diversity of available microprocessors.     

SAW电视中频滤波器三次行程的分析方法

随着立体声电视和高清晰度电视等的发展,对声表面波电视中频滤波器的性能提出了更严格的要求,首先介绍了声表面波电视中频滤波器三次行程反射问题形成的主要原因,由于它与主信号的幅度只差12dB,将会使滤波器的通带波动达到不可容许的地步,因此必须加以抑制,本文讨论了分别采用同相位法;声表面波单相单向换能器（Single Phase Unidirectional Transducer,SPUDT）来消除三次行程信号的影响。     

时间尺度域的匹配滤波器与信号检测

本文从连续子波变换和子波级数的性质及子波的框架理论出发，推导了时间尺度域的匹配滤波器形式，理论分析表明它的思想性能和匹配滤波器相同。     

Application of Monolithic CMOS Switched-Capacitor Filters and Amplifiers for Signal Processing

A custom monolithic CMOS array was designed and integrated for use in meeting the analog conditioning requirements for microsignal processors. These processors are used in "smart" sensors for the purposes of detection and classification. Constrained by very low power dissipation requirements, this array provides a variety of bandpass and low-pass filter functions and programmable CMOS operational amplifiers for AGC amplification for signals in the audio region. Specifically, the custom chip contains 12 poles based on switchedcapacitor techniques partitioned into a 6-pole low-pass filter ladder configuration, and three 2-pole bandpass and low-pass state variable filter configurations. The amplifiers were used in conjunction with an associated microprocessor for software-controlled AGC. A mask change can provide for different capacitor ratios, and hence, frequency responses. Also, the switch clock rates can be used to vary the filter characteristics. Operating from a single +5 V supply, this standard process chip dissipates about 2 mW, and meets all predicted performance characteristics.     

基于互补对称滤波器的APCMA信号的盲分离算法

针对小站信号带宽大于主站信号的新非对称成对载波多址（Asymmetric Paired Carrier Multiple Access,APCMA）信号背景,在一种低复杂度的盲抵消结构基础上,提出基于互补对称滤波器的盲分离算法.该算法采用互补对称滤波器从时频域上将混合信号分解为同时含主站信号与小站信号,以及只含小站信号的两路分量信号,在保证采样率不变的情况下对含主站信号的信号分量做进一步的信号分离,通过两路分量信号的同步处理确保了分离之后的两路信号分量中小站信号的可加性和完整性.仿真结果表明,与原低复杂度算法相比,本文算法有效地提升了混合信号的分离性能.此外,本文提出的具有信息不变性的互补对称滤波器有较广泛的应用前景,可用于宽带多信号抵消、信道估计以及隐蔽传输下的扩频检测等问题中.     

信号线滤波器的电磁脉冲防护性能试验

为检验信号线滤波器对电磁脉冲在信号线上产生的传导干扰的抑制能力,针对不同型号的信号线滤波器进行脉冲电流注入(PCI)测试,注入电流峰值分为100 A、200 A和500 A三个等级.测量滤波器输出线残余电流,计算相应电流抑制比,并对滤波器输出线和滤波器外壳之间的绝缘电阻进行测量.试验结果表明,100～500 A之间的注入电流就可以使信号线滤波器输出线与滤波器壳体发生绝缘击穿.因此,试验过程中需要关注滤波器的非线性效应,每个等级注入试验后要及时检查滤波器功能是否正常.