基于流媒体RTP/RTCP协议的视频数据传输

近年来,随着多媒体技术、计算机网络与通信技术的快速发展,视频监控系统也在不断地更新与发展。本文对实时传输协议RTP和实时传输控制协议RTCP进行了深入的分析,并在Linux平台下移植了一个面向对象的RTP库,而且也给出了RTP/RTCP的编程模型的流程图和重要伪代码,其中包括初始化会话、发送数据、接收数据、控制信息部分的详细内容与说明,为实现视频有效传输奠定了软件框架模型。     

基于局域网的H.263视频数据流的实时传输

介绍了一种在局域网上利用RTP技术实时传输H.263图像数据的方法，并对其性能进行了测试，给出了C语言编程实例。通过RTP及RTCP提供的信息对编码端进行码率调整等方法，成功地实现了基于局域网的图像监控系统中的H.263图像数据的实时传送。     

RTP／RTGP和H．264在IPTV直播业务中的应用研究

本文旨在研究实时传输与控制协议（RTP／RTCP）在网络电视（IPTV）直播业务中的应用。首先分析了IPTV实时传输对通信网络的需求以及目前主要的通信网络对电视信息的实时传输的支持能力和存在的问题。然后着眼于IPTV网络直播业务,从网络协议出发,对适合音视频传输的网络协议TCP、UDP、RTP／RTCP进行了比较,分析了RTP／RTCP协议的优势以及不足之处,同时结合H．264视频编码标准探讨了QoS控制。最后展望了IPTV的发展前景。     

RTP/RTCP和H.264在IPTV直播业务中的应用研究

本文旨在研究实时传输与控制协议(RTP/RTCP)在网络电视(IPTV)直播业务中的应用.首先分析了IPTV实时传输对通信网络的需求以及目前主要的通信网络对电视信息的实时传输的支持能力和存在的问题.然后着眼于IPTV网络直播业务,从网络协议出发,对适合音视频传输的网络协议TCP、UDP、RTP/RTCP进行了比较,分析了RTP/RTCP协议的优势以及不足之处,同时结合H.264视频编码标准探讨了QoS控制.最后展望了IPTV的发展前景.     

RTP／RTCP在IP-PBX系统中的应用

IP-PBX(IP-专用交换机)系统是近年来计算机网与传统电话系统技术融合领域的研究热点。而如何在IP-PBX系统中提供有QoS(服务质量)保证的实时通信能力成为一个关键技术。在介绍IP-PBX系统和RTP／RTCP(实时传输协议／实际传输控制协议)的基本原理和功能的基础上详细分析了利用RTP／RTCP为IP-PBX系统提供QoS保证的技术细节。     

流媒体技术讲座 第2讲 实时传输协议

流式传输需要合适的传输协议，以保证实时媒体及时传送到客户端。目前主要的实时传输协议有：用于Internet上针对多媒体数据流的实时传输协议（RTP，Real-time Transport Protocol)，与RTP一起提供流量控制和拥塞控制服务的实时传输控制协议（RTCP，Real-time Transport Control Protocol),定义了一对多的应用程序如何有效地通过IP网络传送多媒体数据的实时流协议（RTSP，Real-time Streaming Protocol),以及正在开发的Internet上的资源预订协议（RSVP，Resource Reserve Protocol)。本文对这种主要协议进行介绍。     

基于流媒体技术的音频实时播放系统的实现

介绍了2种建立音频播放系统的方法：DirectSound技术以及直接调用低级音频设备。该系统基于RTP／RTCP实时协议控制音媒体流的传输，采用UDP作为传输层协议，在PC机＋MS Windows OS系统上，实现了音频流媒体播放器。     

端到端实时视频流发送与接收方案实现

视频流具有边下载边播放的特点,其发送与接收也有多种方法和技术。基于实时传输协议RTP/RTCP协议和网络编程接口WinSock技术,提出了一种实时视频流发送与接收方案,该方案利用IP网络的分层结构和RTP/RTCP协议的反馈机制实现传输包的封装、控制视频流的发送与接收速率。本文对方案进行了描述,并阐述了该方案的实现方法。     

实时传输协议及在无线流媒体业务中的应用

分析了实时传输协议（RTP）和实时传输控制协议（RTCP）的基本概念、协议结构和工作机制,介绍了适用于无线流媒体通信的音视频编码标准,结合R1甲协议的适用性,讨论了R11P在无线流媒体业务中的应用。     

流媒体技术讲座 第2讲 实时传输协议

流式传输需要合适的传输协议,以保证实时媒体及时传送到客户端。目前主要的实时传输协议有:用于Internet上针对多媒体数据流的实时传输协议(RTP,Real-timeTransportProtocol),与RTP一起提供流量控制和拥塞控制服务的实时传输控制协议(RTCP,Real-timeTransportControlProtocol),定义了一对多的应用程序如何有效地通过IP网络传送多媒体数据的实时流协议(RTSP,Real-timeStreamingProtocol),以及正在开发的In-ternet上的资源预订协议(RSVP,ResourceReserveProtocol)。本文对这几种主要协议进行介绍。     

The application of rapid thermal processing technology to the manufacture of integrated circuits—An overview

Like many of the technologies used to process integrated circuits, the road to manufacturing for rapid thermal processing (RTP) has been twisted. What began as a speculative laboratory apparatus has evolved into a cornerstone of IC technology. Qualities that make RTP desirable for IC manufacture include the ability to process wafers individually, the ability to minimize the time wafers spend at elevated temperature, the convenience of clustering RTP to other systems, and the possibility of maintaining cold reactor walls. This paper will review how these properties make RTP desirable. The paper also will present an overview of the difficulties surrounding the use of RTP and describe how many serious hurdles have been overcome. It will summarize the evolution of RTP from a curiosity to a mainstay technology in building integrated circuits. It then will describe SEMATECH’s role in working with RTP, ending with a direction for future application of RTP based on the National Technology Roadmap for Semiconductors (NTRS).     

H.261视频数据流的RTP封装

H.261视频编解码标准广泛应用于IP网络的视频通信中,一般采用实时传输协议(RTP)保证H.261视频数据流的实时传输和质量监测.本文在分析H.261帧结构和RTP协议的基础上,基于H.261数据RTP封装的三层结构,此提出了一种新的适用于低带宽高效的封装算法和具体实现方法.     

Transient thermal behavior in a new RTP chamber

The transient thermal behavior of 200 and 300 mm wafers in a new rapid thermal processing (RTP) chamber is investigated. The AST3000 is a new RTP tool to meet the process requirements for both wafer sizes in 0.18 μm technologies and beyond. In this paper, experimental results obtained on both 200 and 300 mm wafers for varying processing conditions are shown: spike anneal experiments with fast ramp rates up to 200°C/s were performed. For standard anneal recipes, the steady state time is varied in a broad range and also the inherent temperature uniformity is investigated.     

Rapid thermal processing of silicon wafers with emissivity patterns

Fabrication of devices and circuits on silicon wafers creates patterns in optical properties, particularly the thermal emissivity and absorptivity, that lead to temperature nonuniformity during rapid thermal processing (RTP) by infrared heating methods. The work reported in this paper compares the effect of emissivity test patterns on wafers heated by two RTP methods: (1) a steadystate furnace or (2) arrays of incandescent lamps. Method I was found to yield reduced temperature variability, attributable to smaller temperature differences between the wafer and heat source. The temperature was determined by monitoring test processes involving either the device side or the reverse side of the wafer. These include electrical activiation of implanted dopants after rapid thermal annealing (RTA) or growth of oxide films by rapid thermal oxidation (RTO). Temperature variation data are compared with a model of radiant heating of patterned wafers in RTP systems.     

一种具有QoS保障的并行视频服务接入控制算法

文章提出了一种并行视频服务的连接接入控制CAC(Connections Admission Control)算法.用网络分解的方法分析了系统存储和传输节点上视频数据传输延时,并通过对RTP连接进行接入控制,在网络出现拥塞的情况下,能够保障已连接用户的视频服务质量.     

Ultralong Room‐Temperature Phosphorescence from Amorphous Polymer Poly(Styrene Sulfonic Acid) in Air in the Dry Solid State

Polymer‐based room‐temperature‐phosphorescent (RTP) materials are attractive alternatives to low‐molecular‐weight organic RTP compounds because they can form self‐standing transparent films with high thermal stability. However, their RTP lifetimes in air are usually short (<≈0.4 s). Here, the simple organic amorphous polymer, poly(styrene sulfonic acid) (PSS), exhibits an ultralong RTP lifetime in air when desiccated. The maximum lifetime is 1.22 s, which is three times that of previously reported RTP amorphous organic polymers. The lifetime can be controlled by the PSS molecular weight and by the ratio of sulfonic acid groups introduced into the polymer. The dry polymers should enable unprecedented molecular engineering in organic molecule‐based optoelectronic devices because of the self‐standing and thermal stability attributes.     

基于SIP的Internet电话

文章先给出了基于ＳＩＰ（会话初始化协议）的Ｉｎｔｅｒｎｅｔ电话的协议结构,随后对其中传输数据的ＲＴＰ（实时传输协议）和ＲＴＣＰ（实时传输控制协议）进行了介绍和分析,并对会话初始化协议的组成实体、命名、寻址、操作进行了详细的论述。     

快速热处理对重掺As硅单晶中氧沉淀的影响

对重掺As硅片进行快速热处理，发现重掺As硅片中氧沉淀行为与快速热处理温度、保温时间和降温速度有很大的关系. 随着快速热处理温度的升高、降温速度的增大和保温时间的延长，氧沉淀的密度增大. 最后对影响的机理进行了讨论.     

Self‐Protective Room‐Temperature Phosphorescence of Fluorine and Nitrogen Codoped Carbon Dots

The unstable triplet excited state is a core problem when developing self‐protective room temperature phosphorescence (RTP) in carbon dots (CDs). Here, fluorine and nitrogen codoped carbon dots (FNCDs) with long‐lived triplet excited states, emitting pH‐stabilized blue fluorescence and pH‐responsive green self‐protective RTP, are reported for the first time. The self‐protective RTP of FNCDs arises from n–π * electron transitions for C? N/C?N bonds with a small energy gap between singlet and triplet states at room temperature. Moreover, the interdot/intradot hydrogen bonds and steric protection of C? F bonds reduce quenching of RTP by oxygen at room temperature. The RTP emission of FNCDs shows outstanding reversibility, while the blue fluorescence emission has good pH stability. Based on these FNCDs, a data encoding/reading strategy for advanced anticounterfeiting is proposed via time‐resolved luminescence imaging techniques, as well as steganography of complex patterns.     

高温快速热处理对氧沉淀消融的作用

通过对已经过两步(低-高)退火的大直径直拉硅单晶片进行高温快速热处理,研究硅中氧沉淀被高温快速热处理消融的情况.研究证实:高温快速热处理可以显著地消融氧沉淀,氧沉淀消融的决定性因素是热处理温度.另外,讨论了快速热处理消融氧沉淀的物理机制.