DSP系统多通道数据采集的高效实现

比较了ＤＳＰ系统多通道数据采集的实现方法，分析了多通道数据采集的主要体系结构及其各自的优缺点，提出了一个高性能价格比的解决方案和在ＤＳＰ系统中应用ＡＤ７８７８实现多通道数据采集的方法，给出了一个应用ＡＤ７８７８实现单脉冲雷达差支路ＡＤ变换的实例，并进行了系统性能校验。     

准连续波跟踪雷达信号处理机的设计与实现

目的 开发适合准连续波跟踪雷达特点的高性能数字信号处理机。方法 根据准连续波雷达的特点,以中频采样技术代替传统的模拟双通道采样。在处理机设计方面,用高性能的通用浮点ＤＳＰ代替专用ＤＳＰ,并采用了并行处理结构。结果 本实现方法与传统的模拟实现方法相比,镜频抑制比提高近１倍。结论 中频采样技术适合准连续波雷达体制。另外,利用通用ＤＳＰ作为处理机的硬件平台,用软件实现全部信号处理功能,从而简化系统结构,     

V-42bis在DSP中的实现

研究了ＣＤＰＤ（ 蜂窝数字分组数据） 系统中的Ｖ－４２ｂｉｓ 信源数据压缩方案,并针对ＤＳＰ（ 数字信号处理器） 的特性,提出了Ｖ－４２ｂｉｓ 在ＤＳＰ上实现的数据结构和相应算法。在占用内存空间和压缩字典维护两方面取得了良好的效果     

基于数字信号处理器的标准清晰度电视实时传送复用器实现

提出了一种采用数字信号处理器（ＤＳＰ）的标准清晰度电视（ＳＤＴＶ）实时复用器的实现方案。系统以ＴＩ通用定点ＤＳＰ ＴＭＳ３２０Ｃ５０为主处理器,配合少量呵编程逻辑器件（ＰＬＤ）,在硬件和软件设计上充分利用ＤＳＰ的特点,实现了将音频、视频和辅助数据实时复用成符合ＭＰＥＧ２系统层传输规范的码流。系统还具有ＲＳ编码功能和Ｅ２接口,具备加扰扩展功能。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     

具有漏点弥补和漫游窗口的高速数字扫描变换算法

为了显示现代雷达、超声检查、声纳的图象，比较了由极坐标到直角坐标的数字扫描变换器（ＤＳＣ）的各种实现方案。提出了一种单元增量计数法实现的高速数字扫描变换方案，并讨论了用新方案消除ｍｏｉｒé赝象的弥补算法及一种结合ＤＳＣ结构的漫游开窗算法。该方案可以集成于一片现场可编程门阵列（ＦＰＧＡ）中，并已应用于多种雷达数字显示系统。结果证明应用该方案可以达到５０ＭＨｚ的点变换速度，并同时完成弥补漏点和放大漫游窗口。     

CCITTG.722音频编码系统及其编,解码器的设计与实现

ＣＣＩＴＴＧ．７２２建议书描述的是一种５０￣７０００Ｈｚ音频信号的压缩编码系统，码率为６４ｋｂｉｔ／ｓ。该系统采用了子带自适应差分脉冲编码技术（ＳＢ－ＡＤＰＣＭ），具有ＦＭ广播的音质。本文简介了Ｇ．７２２压缩编码系统，介绍了运用ＴＭＳ３２０Ｃ２５定点高速数字，处理器实时实现编、解码算法的方法，分析了编、解码器的工程实现中要解决的主要问题。     

基于小波变换的图象压缩

要在模拟和移动通讯中传输数字图象，首先必须对图象实行高比率的压缩，本文对讨论小波变换的特征机理，建立了以小波变换为基础图象压缩软件模拟系统，并同标准ＪＰＥＧ的图象压缩方法做了对比实验，结果证明：在高压缩比时，基于小波变换压缩的重建图象ＰＳＤＮ和重建图象质量都明显地成于传统的ＤＣＴ压缩方法。     

19-2kbits CDPD调制解调器

提出了一种基于蜂窝数字分组数据（ＣＤＰＤ） 系统的无线分组ｍｏｄｅｍ 即ＣＤＰＤ ｍｏｄｅｍ 的软硬件实现方案。采用高速数字信号处理器芯片、在系统可编程器件、ＧＭＳＫｍｏｄｅｍ 芯片、９００ ＭＨｚ 射频模块及其他相关器件，实现了ＣＤＰＤｍｏｄｅｍ 中子网相关会聚协议、移动数据链路协议、媒质接入控制协议和物理层协议。提供了实验样机的测试结果，并对结果进行了分析     

DSP技术在RDS编码系统中的应用

本以ＲＤＳ编码系统的ＤＳＰＡ技术实现为研究对象,突破传统的ＲＤＳ系统设计方案,采用ＴＩ公司的ＤＳＰ芯片－ＴＭＳ３２０Ｃ２ＸＸ（Ｆ２０６）作为整个系统的核心,用软件实现编码、数字成形滤波和调制等功能。     

单脉冲雷达动目标跟踪信号处理机

目的 研究单脉冲雷达数字动目标跟踪信号处理机的原理,方案及其实现。方法 动目标跟踪采用波形分析法提取跟踪误差,处理机由单脉部雷达和、差,差３通道数据采集系统和多ＤＳＰ处理系统组成,差通道数据采集系统采用多路高速采保加模拟开关加中速Ａ／Ｄ方案,ＤＳＰ处理系统采用定点,浮点和主从多ＤＳＰ流水处理的体系结构。结果 处理机结构简化,可靠性提高,速度提高。结论 所设计的单脉冲雷达目标跟踪信号处理机是一种高性     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to