ADSL系统远端Modem中DSP／MCU的组合应用

介绍了ＡＤＳＬ基本原理,指出单片ＤＳＰ芯片组成的ＤＳＰ系统已很难适应ＡＤＳＬ系统的功能要求,多片ＤＳＰ芯片组成的并行处理系统增加了并行芯片之间的通信负担,实际仍不能解决问题,同时增加了系统的复杂性,使系统体积过大,难以应用于实际,利用ＤＳＰ／ＭＣＵ组合应用,系统简单易行,可以充分发挥ＤＳＰ长于密集数字信号处理,ＭＣＵ长于智能控制且编程相对容易的优点。     

数字信号处理器（DSP）在脉冲压缩中的应用研究

讨论数字信号处理器在雷达脉冲压技术中的应用。在分析雷达数字脉冲压缩技术的基础上,分别给出通用ＤＳＰ和专用ＤＳＰ实现脉冲压缩系统的方案。讨论这两种方案中ＤＳＰ的应用结构及其优缺点,并给出脉压系统选用ＤＳＰ的依据,并介绍目前可以应用于雷达冲压压缩系统的通用及专用ＤＳＰ芯片。     

用ADSP—21060芯片构建多处理器DSP系统

采用多处理器数字信号处理（ＤＳＰ）系统是现代数字信号处理技术发展的客观要求,这里介绍了用ＡＤＳＰ—２１０６０芯片作为ＣＰＵ来构建多处理器ＤＳＰ系统的设计实现方案。     

基于C62的DTV实时多节目复用器设计

介绍了一种采用高速ＤＳＰ的ＤＴＶ实时多节目复用器的实现方案。系统以ＴＩ通用定点ＤＳＰＴＭＳ３２０Ｃ６２０１为主处理器,配合少量ＰＬＤ,硬件和软件设计充分利用ＤＳＰ的特点,实现将多路音频、视频和辅助数据实时复用成符合ＭＰＥＧ－２系统层传输规范的码流。系统还具有ＲＳ编码功能和加扰扩展功能。由于系统规范主要由ＤＳＰ软件实现,因而能通过修改软件以适合不同的应用场合。系统具有完备的调试电路,良好的可维护性。     

短波单边带通信系统中数字化中音频的实现

数字信号处理技术（ＤＳＰ）相对于模拟信号处理在电路的精确性、灵活性、可靠性等方面有一个质的飞跃。ＤＳＰ用于短波通信系统的调制、解调可以灵活地通过软件来实现,大大地提高了性能指标。将ＤＳＰ技术应用到短波单边带通信系统中有以下几种模式：将ＤＳＰ技术应用于一混频之前、将ＤＳＰ技术应用于三混频之前和将ＤＰＳ技术应用于二混频之前。本文给出了数字化短波单边带通信系统中实现数字化中音频的实施方案（发信机和收信机     

数字信号处理的最新发展及其在广播电视中的应用 上

本文扼要阐述ＤＳＰ的最新发展及其在广播电视中的应用。全文分四部分：第一部分介绍ＤＳＰ的广泛应用，ＤＳＰ芯片的结构及最新发展；第二部分阐述ＤＰＳ系统硬件和软件的可分性和互换性；第三部分介绍ＤＳＰ开发系统的主要组成部分以及最新发展；第四部分举例介绍ＤＳＰ技术在静像压缩，电视电话和数字有线电视中的应用。     

基于PCI总线的DSP数据运算平台设计

本文分析了目前市场上常见主流的ＰＣＩ接口芯片的特点,详细介绍ＤＳＰ完整系统的设计思路,包括ＰＣＩ 总线接口设计,ＤＳＰ系统自举,ＤＳＰ与主机的通信,驱动程序等几个方面。     

基于ADSP2106XSHARC的多媒体终端

本文在简介目前浮点运算功能最强的浮点ＤＳＰ芯片ＡＤＳＰ２１０６０以及定点ＤＳＰ芯片ＡＤＳＰ２１８１的结构和发基础上，具体阐述了应用这两种芯片构成基于ＰＣＬ总的多媒体通信卡的设计原理，并展望了这一系统设计的前景。     

与DSP接口兼容的单／双通道采样模数转换器—DSP101／DSP102

ＤＳＰ１０１／ＤＳＰ１０２为带采样电路的高速、高分辨模数转换器。该芯片只需很少的我围元件即可工作，并可ＤＳＰ芯片直接接口非常适合高速数据采集及处理系统。本文介绍了它们的功能和特点，并给出了它们与ＤＳＰ接口的应用实例。     

从微波PDH监控系统到微波SDH网管系统

本文介绍了微波ＰＤＨ监控系统的早期发展和进一步发展以及微波ＳＤＨ网管系统,着重于体系结构的介绍。无论是微波ＰＤＨ监控系统,还是微波ＳＤＨ网管系统,在系统体系结构中都设计了前端机,由此可见前端机在系统设计中的重要性。     

千兆网综合布线系统

千兆网的应用需要高性能综合布线系统的支持。结合千兆网综合布线系统的布线标准和测试标准,本文对千兆网综合布线系统设计中的线缆选型和测试等重要环节进行了探讨。     

新型片状磷平面扩散源的应用研究

分析了新型片状固态磷平面扩散源(PDS)的掺杂机理,并与液态POCl3源扩散进行了比较,指出可用片状固态磷PDS来替代POCl3实现磷扩散工艺的预沉积。基于PDS预沉积的实验结果,分析了影响方块电阻大小及其均匀性的关键因素,给出了工艺方案,并通过实际产品的电学参数测量结果验证了工艺方案的可行性,可供新型片状磷PDS在大直径硅扩散工艺中的推广使用参考。     

Packet rescheduling in WDM star networks with real-time servicedifferentiation

In this paper, we propose a novel scheduling scheme, namely priority-differentiated scheduling (PDS), which is designed to handle real-time (high-priority) packets in wavelength division multiplexing (WDM) star networks. PDS allows high-priority packets to preempt the prescheduled low-priority (nonreal time) packets. By scheduling the high-priority packets first, and then having the preempted packets rescheduled, PDS guarantees that the high-priority packets can always achieve the earlier transmission than the others in order to meet the quality of service (QoS) requirements. In addition, it does not sacrifice the performance of nonreal-time packets. As a matter of fact, low-priority packets can also benefit from PDS algorithms. This scheme has the capability of handling channel collision and destination conflict, and it supports variable-length packets. This paper also provides an insight into the data channel selection technique along with PDS. With the proposed algorithm that selects a data channel with minimum scheduling latency (MSL), the channel throughput is improved. The performance of the PDS scheme has been extensively studied by means of numerical simulations     

苏州广电现代传媒广场综合布线系统设计

针对苏州广电现代传媒广场项目体量大、业态多、涵盖子系统复杂的设计需求,通过合理规划项目各功能区域以及各专网系统的业务范围,把各弱电子系统通过综合布线平台有机结合在一起.在此基础上规划了各专网系统的综合布线方案和路由,进而详细阐述了综合布线系统的架构.最后提出了一套清晰有效的综合布线标识管理方案,为综合布线系统日后的顺利施工以及运行奠定了基础.     

Measuring Power Distribution System Resistance Variations

Metal resistance variations in back-end-of-line processes can be significant, particularly during process bring-up. In this paper, we propose a simple method to measure resistance variations in the power distribution system (PDS) eof an IC. Our technique utilizes the PDS because it is an existing distributed resource in all ICs and provides a means of characterizing resistance in the context of the actual circuit design. By applying a set of tests using small on-chip support circuits attached to the PDS, the resistance of components of the PDS can be obtained from the solution to a set of simultaneous equations. The results from hardware experiments involving two sets of test chips fabricated in an IBM 65-nm technology show significant changes in the resistance variation of some components of the PDS as the process evolved.      

PKI/CA技术在PDS系统中的实现与部署

随着企业信息化建设的不断推进,PDS系统已经成为国防军工企业战略发展的重要组成部分。为了解决PDS系统安全性问题,结合PDS系统业务应用的现状,这里以国际通用先进的信息安全技术为参考,依据安全等级防护标准和信息安全技术的研究,提出了采用PKI公钥基础设施为PDS系统提供安全支撑的技术思路及实现部署方案。并从方案的改造原理、改造效果、改造内容等多个角度对提出的方案进行了说明,此实现部署方案在实际信息安全访问控制中具有可靠性和有效性,为PKI_CA技术在国防军工PDS系统的安全应用提供了一个可借鉴的方法和思路。     

Performance Evaluation of Novel AMDF‐Based Pitch Detection Scheme

A novel average magnitude difference function (AMDF)‐based pitch detection scheme (PDS) is proposed to achieve better performance in speech quality. A performance evaluation of the proposed PDS is carried out through both a simulation and a real‐time implementation of a speech analysis‐synthesis system. The parameters used to compare the performance of the proposed PDS with that of PDSs that are based on either a cepstrum, an autocorrelation function (ACF), an AMDF, or circular AMDF (CAMDF) methods are as follows: percentage gross pitch error (%GPE); a subjective listening test; an objective speech quality assessment; a speech intelligibility test; a synthesized speech waveform; computation time; and memory consumption. The proposed PDS results in lower %GPE and better synthesized speech quality and intelligibility for different speech signals as compared to the cepstrum‐, ACF‐, AMDF‐, and CAMDF‐based PDSs. The computational time of the proposed PDS is also less than that for the cepstrum‐, ACF‐, and CAMDF‐based PDSs. Moreover, the total memory consumed by the proposed PDS is less than that for the ACF‐ and cepstrum‐based PDSs.     

An automated parallel simulation flow for cyber-physical system design

Parallel and distributed simulation (PDS) is often employed to tackle the computational intensity of system-level simulation of real-world complex embedded and cyber-physical systems (CPSs). However, CPS models comprise heterogeneous components with diverge semantics for which incompatible PDS approaches are developed. We propose an automated PDS flow based on a formal modeling framework—with necessary extensions—targeting heterogeneous embedded and CPS design. The proposed flow characterizes the sequential executable specification of a heterogeneous model and generates a PDS cluster. State-of-the-art graph partitioning methods are adopted and a new extensible constraint-base formulation of the model partitioning problem is developed. The applicability, effectiveness, and scalability of the proposed flow is demonstrated using case studies.     

Proportional differentiated admission control

This letter presents a new admission control policy inspired in the framework of proportional differentiated services (PDS). While most of previous PDS has focused on average queueing delays and packet drops to differentiate the performance of adaptive applications, the proportional differentiation admission control (PDAC) differentiates inelastic traffic in terms of blocking probabilities. The PDAC is built up using asymptotic approximation theory, employs a class based approach, and conforms with the PDS requirements of predictability and controllability . Numerical experiments confirm a good performance of the approach.     

Considering noise orbital deviations on the evaluation of power density spectrum of oscillators

This brief presents a new application of the theory of noise in free running oscillators based on the Floquet eigenvector decomposition. In oscillators, all orbital deviations contribute to the power density spectrum (PDS) as much as the "phase" term, usually considered. Each orbital deviation component shows a time evolution depending on the related Floquet eigenvalue, which thus characterizes statistical properties related to that component. Orbital deviations are partially correlated, due to their common origin from noise sources, thus also correlation terms are considered in the evaluation of the PDS. In this brief, we introduce a simplified method of calculation of PDS and apply it to an example of RLC negative resistance oscillator. Results show the relevance of orbital deviations in PDS in presence of stationary noise, these contributions becomes particularly relevant when noise is cyclostationary.