数字电视机顶盒中SI引擎的设计

在简单介绍SI引擎的基础上详细分析SI引擎中实时数据库的实现方法.     

数字电视机顶盒中SI引擎的设计

在简单介绍SI引擎的基础上详细分析SI引擎中实时数据库的实现方法。     

一种优化的机顶盒SI引擎的设计与实现

介绍了一种SI引擎的优化设计方案.该方案统一了SI模块向上和向下的接口,在搜索引擎方面改进了搜台机制和EIT搜索机制,对数据更新也采取了新的办法,在查询引擎方面引进了内存智能动态分配方法,阐述了SDK接口工作方式,并简要介绍了该引擎的运行效果.     

机顶盒中SI引擎的分析与设计

在对PSI／SI表进行了详细分析的基础上阐述了如何设计通用、高效、可靠、容错、有可扩展性的处理PSI／SI表SI引擎的相关和关键技术。     

高速通信系统中信号完整性设计工具的选择策略

随着通信系统中高速板设计复杂性的日益提高,人们已经认识到依赖某一种特定的CAD工具已经无法在可接受的精度范围内完成整个设计仿真。为了完成困难的设计任务,PCB设计工程师和SI设计工程师要采用各种仿真工具。除了价格、性能、速度和精度始终是选择所期望的工具集的主要选择准则之外,如何使用来自多家EDA工具供应商的CAD工具来实现设计目标、SI和EMI设计规则,也是中国设计工程师关注的重要问题。一般来说,优良的设计和SI/EMI分析工具的组合应该包括:版图设计工具、板级仿真器、精确的场求解工具以及详细的仿真引擎。本文介绍如…     

SI单位的倍数单位

SI单位的倍数单位是由SI词头与SI基本单位和SI导出单位构成。倍数单位的选取一般应量的数值处于0.1～1 000之间。.SI词头是用于构成倍数单位的因数符合,不能单独使用。     

SI单位的倍数单位

SI单位的倍数单位是由SI词头与SI基本单位和SI导出单位构成。倍数单位的选取一般应量的数值处于0．1～1000之间。     

SI单位的倍数单位

<正>SI单位的倍数单位是由SI词头与SI基本单位和SI导出单位构成。倍数单位的选取一般应量的数值处于0.1～1000之间。·SI词头是用于构成倍数单位的因数符合,不能单独使用。     

基于望远镜搜索的块匹配运动估值的低功耗VLSI结构

在一种基于望远镜搜索的块匹配运动估值的 VL SI实现中 ,对用于加速搜索的传统心动阵列引擎进行了结构上的改进 ,从而能够显著地降低功耗 .方法是使用一种新的块匹配误差计算的提早跳出技术 ,并通过在阵列处理单元中屏蔽操作数来避免不必要的计算操作 .基于算法模拟结果的简单估计表明 :使用新结构搜索引擎的运动估值 ,功耗可降低到原来的 40 %左右 ,而仍然保持着相同的处理速度和相似的视频解码图质量 .     

SI单位的倍数单位

SI单位的倍数单位是由SI词头与SI基本单位和SI导出单位构成。倍数单位的选取一般应量的数值处于0.1～1 000之间。.SI词头是用于构成倍数单位的因数符合,不能单独使用。.词头符号与所紧接着的单位符号应作为一个整体对待,它们共同组成一个新单位(十进倍数或分     

Design of computer controlled combustion engines

Globalization and growing new markets, as well as increasing emission and fuel consumption requirements, force the car manufacturers and their suppliers to develop new engine control strategies in shorter time periods. This can mainly be reached by development tools and an integrated hardware and software environment enabling rapid implementation and testing of advanced engine control algorithms.

The structure of a rapid control prototyping (RCP) system is explained, which allows fast measurement signal evaluation, and rapid prototyping of advanced engine control algorithms. A hardware-in-the-loop simulator for diesel engine control design is illustrated, simulation results for a 40 tons truck are presented. Providing efficient engine models for the proposed development tools, a dynamic local linear neural network approach is explained and applied for modelling the NO_x emission characteristics of a 1.9 l direct injection diesel engine. Furthermore the application of a RCP system is exemplified by the application of combustion pressure based closed-loop ignition timing control for a SI engine. Experimental results are shown for a 1.0 l SI engine on a dynamic engine test stand.     

Adaptive and Learning Control for SI Engine Model With Uncertainties

Air--fuel ratio control is a challenging control problem for port-fuel-injected and throttle-body-fuel-injected spark ignition (SI) engines, since the dynamics of air manifold and fuel injection of the SI engines are highly nonlinear and often with unmodeled uncertainties and disturbance. This paper presents nonlinear control approaches for multi-input multi-output engine models, by developing adaptive control and learning control design methods. Theoretical proofs are established that ensure that proposed controllers are able to give asymptotical tracking performance. As a comparison, the method applying global linearizing controller can give accurate tracking for the engine model without uncertainty and disturbance, but it fails to keep tracking performance when uncertainty is incorporated into the system. Adaptive control and learning control approaches are capable of dealing with both constant uncertainty and time-varying periodic uncertainty. Simulation results illustrate the efficacy of the proposed controllers.      

Coordinated Nonlinear Speed Control Approach for SI Engine With Alternator

In the paper, the speed control problem for spark-ignition (SI) engine with alternator is investigated. The problem is addressed from the engine side and the alternator side, respectively, and two coordinated control schemes are proposed for two different operating modes. From the engine side, the torque produced by the alternator is treated as the external disturbance, and a state feedback controller with the magnetic torque feedforward is designed for regulating the engine speed. And from the alternator side, the engine torque ripple is considered as the external disturbance of the alternator rotational dynamics. A disturbance rejection method is proposed to achieve the L ₂-gain performance for the speed servo error. Finally, to demonstrate the validity of the proposed approaches, some simulation results will be shown     

Recent Advances in Control-Oriented Modeling of Automotive Power Train Dynamics

This paper presents a survey of the recent research results of the authors in the field of modeling of automotive power train systems and components. The goal of the research is to propose simple and accurate power train models for controller design and to propose computationally efficient simulations. The modeling includes typical power train components such as electronic throttle, SI engine, torque converter, planetary gear set, wet clutch, differential, half shaft, and tire. Experimental model validation results are presented.     

Modeling, Quantitative Analysis, and Design of Switched-Current Pipeline A/D Converters

Switched-current (SI) analog-to-digital converters (ADCs) are desirable for biomedical applications. Until now, SI ADCs are lacking effective and systematic computer-aided analysis and design (CAD) tools, particularly for noise. In this paper, models for different SI multiplying-digital-to-analog-converter (MDAC) designs are analytically derived, with the inclusion of distortion and noise. The models can be further programmed into an equation-based SI analog CAD tool. In this paper, the equation-based models (EBMs) are used to quantitatively analyze SI MDACs. Simulation results show that noise significantly limit the performance of SI MDACs. Optimal performance boundaries are derived for single-ended and fully differential SI MDACs. The boundaries from EBMs are consistent with the published SI circuit measurements. A methodology is formulated to design efficient SI MDACs. The EBM and the design methodology are further verified by designs of two sample SI MDACs in an AMS 0.35-mum CMOS process with SPICE simulation. Results from the EBM match those from real circuit models well, except for the noise of SI MDACs with feedback, in which case, the design margin should be added to the target performance. For low-/medium-resolution (<12 bit) applications, a pipeline ADC with a simple SI MDAC is the most efficient. Nonetheless, single-ended SI ADCs are susceptible to source noise. For high-resolution applications, only fully differential SI pipeline ADCs can be selected.     

Polarization-based optimal detection scheme for digital self-interference cancellation in full-duplex system

In order to detect and cancel the self-interference (SI) signal from desired binary phase-shift keying (BPSK) signal, the polarization-based optimal detection (POD) scheme for cancellation of digital SI in a full-duplex (FD) system is proposed. The POD scheme exploits the polarization domain to isolate the desired signal from the SI signal and then cancel the SI to obtain the interference-free desired signal at the receiver. In FD communication, after antenna and analog cancellation, the receiver still contains residual SI due to non-linearities of hardware imperfections. In POD scheme, a likelihood ratio expression is obtained, which isolates and detects SI bits from the desired bits. After isolation of these signal points, the POD scheme cancels the residual SI. As compared to the conventional schemes, the proposed POD scheme gives significantly low bit error rate (BER), a clear constellation diagram to obtain the boundary between desired and SI signal points, and increases the receiver's SI cancellation performance in low signal to interference ratio (SIR) environment.     

CMOS switched-current ladder filters

The design and implementation of switched-current (SI) ladder filters is described. The basic current-mode circuits, including the SI differential integrator/summer are developed. The SI integrator/summer is shown to be directly analogous to the switched-capacitor (SC) integrator/summer; thus, all the synthesis techniques developed for the design of SC filters can be used to synthesize SI filters. Signal flowgraph synthesis of SI ladder filters is presented. The nonideal characteristics of SI ladder filters that limit their accuracy are evaluated. Clock-feedthrough and device mismatch induced errors are more severe in the present SI circuit configurations than in SC circuits. A standard digital 2-μm n-well CMOS process has been used to implement two high-order ladder filters. Simulations accurately predict the measured results of the first integrated SI filters. The area and power dissipation are comparable to those obtained with the switched-capacitor technique