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Lectures on Numerical Methods in Bifurcation Problems
Methods for Finding Zeros in Polynomials
Lectures on Stochastic Flows and Applications
Educational Psychology by Edward L. Thorndike
The Last Days of Tolstoy by V. G. Chertkov
Globalization and Responsibility
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Lectures on Topics In One-Parameter Bifurcation Problems
History of the Incas by Pedro Sarmiento de Gamboa
Linear Algebra: Theorems and Applications
Lectures on Stochastic Differential Equations and Malliavin Calculus
A Short Biographical Dictionary of English Literature
Lectures on Sieve Methods and Prime Number Theory
Dollars and Sense by William Crosbie Hunter
The Theory of the Theatre by Clayton Hamilton
The Mathematics of Investment
Occupiers of Wall Street: Losers or Game Changers
The Solution of the Pyramid Problem
Lectures on Moduli of Curves
Walden by Henry David Thoreau
Methods for Finding Zeros in Polynomials
Lectures on Stochastic Flows and Applications
Educational Psychology by Edward L. Thorndike
The Last Days of Tolstoy by V. G. Chertkov
Globalization and Responsibility
Lectures on Siegel Modular Forms and Representation by Quadratic Forms
Lectures on Topics In One-Parameter Bifurcation Problems
History of the Incas by Pedro Sarmiento de Gamboa
Linear Algebra: Theorems and Applications
Lectures on Stochastic Differential Equations and Malliavin Calculus
A Short Biographical Dictionary of English Literature
Lectures on Sieve Methods and Prime Number Theory
Dollars and Sense by William Crosbie Hunter
The Theory of the Theatre by Clayton Hamilton
The Mathematics of Investment
Occupiers of Wall Street: Losers or Game Changers
The Solution of the Pyramid Problem
Lectures on Moduli of Curves
Walden by Henry David Thoreau
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数字电视原理与实现
Posted on 2010-04-28
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第一章 概 述
1 电视系统的全面数字化趋势及其影响 在通信领域内的数字化已为人们所熟悉,例如程控电话、计算机通信以及移动通信都实现了数字化。 近年来,电视领域也发生了一系列的变化,在电视节目的制作设备方面已有很大一部分实现了数字处理;在电视节目的储存设备方面也出现了许多数字设备,包括人们最熟悉的VCD等 ;在节目的传输方面,我们从卫星上已可以接收到多套数字压缩编码的节目。 电视系统的全面数字化正以超出人们预料的速度向前发展,这就要求人们不断更新知识,以便跟上技术发展的步伐。 电视系统的全面数字化将会引起一系列技术革新: (1)将最终形成电视、电话和计算机三网合一的综合数字业务网。原本是完全不同的媒体的电视广播、电话和计算机数据通信,在全部数字化后,都使用同一符号“0”和“1”,只不过它们的速率不同而已,人们可以把信号组合在一起,通过一个双向宽带网送到每个家庭。 (2)全面数字的第二个特点是电视制式将实现全球统一,不再会有NTSC、PAL和Secam等不同 的电视制式,而将统一在ITU-R601数字标准之中。因此更利于节目的交换和信息的交流。在 数字系统中标准不仅仅对设备外围的接口,而且对数字信号处理的整个流程和细节都作了详 细规定。MPEG标准将对数字电视的各种应用和系统层作出详细规定。DVB则对各种传输媒介 ,如卫星、电缆和地面传输中的各种处理环节进行了规定。与通信和各种计算机设备及系统相联的标准,目前有DAVIS、MCNS和IEEE P802.14三个标准,不久将会统一。 (3)全面数字化的第三个影响是数字电视业务的可分级性带来的各种业务的统一性,不同质量的信源只是占用的比特率不同,而具有相同的格式,如家用质量的电视比特率在1.5Mbps ,专业级质量在4~5Mbps,广播级质量在8~9Mbps,但都打成MPEG-2传送包,可以在同一个设 备中完成各种不同级别的图象业务。
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