基于地面高清机顶盒的PVR系统设计与开发

以嵌入式高清多媒体播放机顶盒为基础,开发了新一代ADTB-T地面高清PVR系统,利用EPG和数字PVR技术,实现了良好的人机交互以及丰富的PVR功能。该系统兼容支持高清与标清地面广播信号的播放与录制,在应用中表现出了良好而稳定的录播性能,目前已产品化并批量投放市场。     

基于PVR技术的数字电视机顶盒的实现与研究

随着电视技术的发展,数字电视已经成为当今主流产品,而PVR数字电视机顶盒更是一个发展趋势。主要介绍数字电视机顶盒的标准和PVR技术的概况,并根据我国采用的DVB标准的特点、与PVR技术结合所产生的问题以及解决的方案,对PVR机顶盒的实现做了进一步的分析,根据个人经验对PVR机顶盒的实现提出了一套方案。     

PVR机顶盒文件存储系统的设计与实现

简要介绍了具有PVR功能的机顶盒，具体描述了PVR存储系统硬件与软件的设计与实现，重点讨论了PVR的关键部分——文件存储系统的设计和实现。     

电视

0220468HDTV 编码器测试系统的设计与硬件实现[刊]/潘其涛//计算机工程.—2002.28(6).—214～215(E)0220469数字电视机顶盒上的个人录放技术:PVR[刊]/白淳//广播与电视技术.—2002,29(5).—116～120(L) 本文简述了国际上 PVR 技术的应用情况,并且介绍了一种具有 PVR 功能的数字机顶盒技术平台,最后讨论了 PVR 实现过程中的几个关键技术:A/V 同步、特技播放和解码版权保护等。0220470有线电视 HFC 网络综合业务开发技术方案的比较及实施设想[刊]/何靖//广播与电视技术.—2002,29(5).—105～110(L)     

个人视频录像(PVR)技术及其在数字电视机顶盒中的应用

介绍个人视频录像（PVR）关键技术的实现原理以及PVR技术与数字电视机顶盒结合产生的一种具有强大功能的PVR机顶盒。随着数字电视技术的发展，PVR技术与机顶盒结合将成为未来的发展方向。     

PVR数字机顶盒的设计与实现

本文介绍一种基于数字机顶盒的个人视频录制系统的设计与实现方法。在分析了PVR四种工作模式的基础上,给出了系统硬件结构和软件控制流程的设计方法。实际测试表明,该系统可以实现单独录制与播放、边录边播、时移播放和预约录制等功能。     

熊猫牌3216R硬盘录像数字电视机顶盒的研发

本文主要介绍了STI5516方案高端PVR硬盘录像机顶盒的系统框架和硬件、软件设计。阐述了节目记录、回放、时移、特技播放等功能的实现方法。     

AES算法在PVR机顶盒中的应用研究

PVR机顶盒是数字电视新的发展趋势,作为运营商收入的主要来源,数字电视节目流的加密保护也得到越来越多的认识和重视。对利用AES算法加密高清数字电视PVR机顶盒中所存储的高清电视节目内容,实现版权保护进行研究。重点介绍AES算法的具体实现步骤和优化,及其在PVR机顶盒上的应用,用C语言完成该算法并对其在嵌入式环境和普通PC机上的执行效率进行了比较。     

数字电视机顶盒上的个人录放技术PVR

本文简述了国际上PVR技术的应用情况，并且介绍了一种具有PVR功能的数字机顶盒技术平台，最后讨论了PVR实现过程中的几个关键技术；A/V同步、特技播放和解码版权保护等。     

数字电视机顶盒的PVR设计与实现

阐述了PVR在嵌入式设备数字机顶盒中实现的原理、节目录制和回放的数据流程、数据文件在存储介质中的读写存储机制等.同时,对数字机顶盒集成的PVR功能,涉及到的技术要点做了细致的分解,把实际应用中几个典型的特色场景进行了展现.     

一种具有超短等待时间的ENVoD

提出了一种具有超短等待时间的NVoD改进方案--ENVoD.它将节目划分为子块,以不同的周期在TS流信道中传送,利用接收机内置的硬盘录像功能对子块进行存储播放,显著改善了NVoD系统的最长等待时间.     

TV gets personal [personal video recorders]

The personal video recorder (PVR)-a TV recorder that records on a computer hard disc as opposed to tape-has evolved as a direct consequence of the development of the PC as a low-cost, high-performance consumer product. Sharing many features with a PC with tens of gigabytes of hard disc storage, the PVR has the potential to revolutionise the way broadcasters schedule TV programmes and the way viewers watch them. Making a PVR an attractive product needs more than the convergence of TV and computer technology. In particular, an effective programme guide service, downloaded either with the TV signal or via the phone network, is crucial in establishing the PVR's attractiveness to viewers. The stored guide data simplifies programme selection and recording, and offers new features like automatic recording of all episodes of a series, even if they're not all at the same time each week. The authors describe how the introduction of the PVR will transforming viewing habits. The systems available are described and possible developments in PVRs are discussed     

In0.25Ga0.75As/AlAs-based resonant tunnelingdiodes grown on prepatterned and nonpatterned GaAs (100) substrates

The DC current-voltage characteristics of strained In_0.25 Ga_0.75As/AlAs resonant tunneling diode (RTD) structures grown on GaAs (100) substrates which also include prepatterned mesas are discussed. The observed peak-to-valley current ratios (PVRs) of 4.5 at 300 K and 15 to 77 K with corresponding peak current densities of 11 and 13 kA/cm² are the highest values of PVR to date for this strained system and are the same for the nonpatterned and prepatterned regions     

The largest players rule the media playground

The top media companies increasingly do a lot more than create content. The 12 companies outlined in this article deliver content via cable systems and the Internet. They also have investments in makers of personal video recorders (PVRs) and set-top boxes and suppliers of video on demand. Consider the former Moxi Digital, builder of a personal entertainment hub that can play DVDs and CDs and can function as a PVR and a set-top box. Moxi's investors, before Vulcan purchased it, included AOL Time Warner, Vulcan, and Scientific-Atlanta. Vulcan also owns Digeo, another hub maker, with which Moxi was merged. Eight of the companies listed-AOL Time Warner, Comcast, Disney, GE, Liberty Media, Sony, Viacom, and Vulcan-were investors in ReplayTV before it was bought by SonicBlue. TiVo, an up-and-coming PVR maker, has attracted hefty investments from almost all major media companies. The most-connected company is AOL Time Warner. Under its umbrella one of its several movie or TV studios can create a film that gets shown on its HBO channel via the Time Warner cable system. Only US business interests are shown here. Many have overseas media holdings, notably France's Vivendi Universal, Japan's Sony, and News Corp. in Australia     

Analysis of transient response and operating speed of MOBILE

To clarify the relationship between the figures-of-merit of resonant tunneling diodes and the operating speed of a monostable-bistable transition logic element (MOBILE), we investigated the transient response of a MOBILE using a simple current-voltage characteristics model. We found that an unstable point in a MOBILE affects its operation, and false operation occurs when the amplitude of the clock signal is inappropriate. From a calculation of transient time using peak-to-valley current ratio (PVR) and peak current density (j/sub P/) as parameters, we also discovered that a sufficiently high j/sub P/ and higher PVR (>6) are necessary for high-speed operations.     

Cooperative and Opportunistic Channel Access for Vehicle to Roadside (V2R) Communications

This paper focuses on vehicle to roadside (V2R) communications in vehicular networks based on the IEEE 802.11 DCF MAC protocol. In vehicular networks, roadside units (RSUs) are typically spaced apart along the road and each vehicle can be connected to an RSU only when the vehicle is within its transmission range. Due to the high relative speed between a moving vehicle and a stationary RSU, the residence time of the vehicle within the coverage of each RSU is very short. Thus it is hard for the system to reach a steady state. With multi-hop forwarding, in which a vehicle may be connected to an RSU through relaying over other vehicles, the connection time of each V2R access may be extended. But this is at the expense of introducing wireless interference among vehicles, which may dramatically degrade the system performance. To tackle these challenges, we propose a new mechanism called Proxy-based Vehicle to RSU access (PVR) for V2R communications. This protocol is designed to exploit cooperative and opportunistic forwarding between any two distant RSUs and to emulate back-to-back transmissions within the coverage of an RSU. As a result, it can shorten the access delay by taking advantage of opportunistic forwarding and mitigate the interference problem during the short residence time within the coverage of an RSU. The simulation results show that PVR achieves excellent performance and outperforms all existing solutions for V2R communications in vehicular networks.     

基于SC2005的PVR机顶盒的设计与实现

机顶盒的出现赋予了电视机更强、更广的功能含义.详细介绍了一种基于SC2005的PVR功能在数字机顶盒上的设计与实现.