When the gsm based gate - way is designed and realized , the paper emphasizes the short message communication technique used in transmitting location data , involves short message actualization unit , protocol configuration , receiving / transmitting process , data pdu encapsulation , data coding , and so on 在系统gsm通信网关的设计与实现中,重点对系统中采用的短消息数据传输技术做了详细的分析,包括短消息的实施单元、协议结构、收发过程以及信息传输过程中数据的pdu封装等。
The signal processing can ensure and improve the performance of plc , the main methods include filter , data coding , error correction , etc . firstly , the characteristic of power line channel is discussed from the transmission lines , noise , and channel attenuation in this paper 信号处理研究是为了保证电力线通信质量、提高其性能,主要的方法如数据编/解码、纠错、抗干扰处理等。本文首先从传输线特性、信道噪声和信道衰减三方面分析了室内电力线信道的特点,并提出一种适合室内近距离的电力线载波通信方案。
In this thesis , principles of data coding for transferring data among different network hierarchies is described , a channel and program management center and a user authorization center are designed , and the integration and application of the system into sdh / hfc network are investigated and implemented 本文对系统中支持不同网络体系间数据格式的转换的数据编码原理进行了描述。设计了该系统频道和节目管理中心以及用户授权管理中心的构架,并对高速数据广播系统在sdh hfc网络中的集成和应用进行了较为深入的研究。
At first , this article introduces the dicom information model and dicom network protocol architecture ; specify the definition of dicom service and object , message data coding , encapsulation of protocol data unite ( pdu ) and the mechanism of message exchange , etc . and then synoptically specifies protocol data unite , presentation data value ( pdv ) , encapsulation of various compose items and the class clusters for this program 本文首先介绍了dicom标准信息模型及其网络协议构架,并且深入浅出地介绍dicom的服务和对象定义、消息数据编码、协议数据单元pdu ( protocoldataunite )的封装以及dicom消息的交换机制等基本原理。然后概括说明了模块中的协议数据单元、表示数据值pdv ( presentationdatavalue ) 、各个组成条目的封装以及在程序中为此定义的类簇。
According to the trade criterion and the demand of spatial database building , refering to the special database of geological hazard and old database structure , at the same time , considering the specialty of geophysical prospecting data , the author standardizes twenty kinds of geophysical attribute database and the data code and the structure of data table 笔者针对地质灾害空间数据库建设的要求,结合已有数据信息标准的特点和结构以及地质灾害勘查中物探信息的特点,对勘查中常用的二十余种物探方法进行了属性数据库的标准化建设。依照物探信息属性库数据项编码规则,给出属性表结构,并以地质灾害勘查物探方法属性库结构为基础,开发了数据管理模块。
Neural networks are used more frequently in lossy data coding than in general lossless data coding , because standard neural networks must be trained off - line and they are too slow to be practical . in this thesis , statistical language model based on maximum entropy and neural networks are discussed particularly . then , an arithmetic coding algorithm based on maximum entropy and neural networks are proposed in this thesis 传统的人工神经网络数据编码算法需要离线训练且编码速度慢,因此通常多用于专用有损编码领域如声音、图像编码等,在无损数据编码领域应用较少,针对这种现状,本文详细地研究了最大熵统计语言模型和神经网络算法各自的特点,在此基础上提出了一种基于神经网络和最大熵原理的算术编码方法,这是一种自适应的可在线学习的算法,并具有精简的网络结构。
The jpeg compression algorithm takes one kind of highly effective static state image data compression algorithm . the widespread application of jpeg in multitudinous inserted in the type multimedia product the image data code and the decoding speed has already become a most important aspect which the restriction product performance enhanced Jpeg压缩算法作为一种高效的静态图像数据压缩算法,广泛的应用于众多的嵌入式多媒体产品中,图像数据编码和解码的速度已经成了制约产品性能提高的一个最重要的方面。
Although stb just is a sort of terminal equipments of the tv signal transmission system , however pivotal technique involves the data demodulation , channel decode , transport stream de - multiplexing , audio and video signal decompression technique and real - time software technique with upriver data coding technique etc . therefore , software and hardware technology research and development of stb , which can increase usefulness with dependable of digital video signal and audio signal for study later make the theories preparation and backlog experience 机顶盒虽然只是数字电视传输系统的终端设备,但所用到的关键技术涉及到数据解调、信道解码、传输流的解复用、音视频信号解压缩技术以及实时软件技术和上行数据的编码技术等。因此,通过对机顶盒软、硬件的研究开发,既能为以后研究如何提高信息传输的有效性和可靠性作理论上的准备,也为图像信号和音频信号的数字化处理积累经验。
Based on the super capability of gis , the paper discusses problems on layer management of related data , design of attribute tables , and data coding etc . the coefficient of the soil liquefaction resistance k and the coefficient of soil liquefaction hazard h are presented . the seismic sand liquefaction forecasting , liquefaction disasters forecasting , and prevention measures on liquefaction are also discussed . using the software of mapgis , the process of liquefaction database setup has been studied 本文基于gis在数据存储管理及可视化方面的强大功能,研究了适合gis环境的液化评价相关数据的分层管理,属性数据表设计以及图元编码等问题;并提出了土层抗液化指数k及砂土液化灾害指数h两个重要液化评价因子,在此基础上进一步研究了地震砂土液化预测、液化灾害预测以及防治处理信息系统建设等问题。
This thesis expatiates the relative theories of mnvms such as motion video capture , data code and real - time transport protocol based on the technology of multimedia and computer network . then the hardware and software models of mnvms are presented . it analyses the function of each software module 本文在计算机多媒体技术和网络技术的基础上分析了多媒体数字视频监控系统相关技术视频采集、数据编码等的基本原理,介绍了实时传输协议,提出了多媒体数字视频监控系统的硬件结构和软件结构通过设计相应的多媒体数字视频监控软件系统,分析了各个重要的软件模块的功能。