共查询到17条相似文献,搜索用时 93 毫秒
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《电子科技文摘》2002,(10)
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) 相似文献
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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。 相似文献
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数字电视机顶盒上的个人录放技术PVR 总被引:4,自引:0,他引:4
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。 相似文献
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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. 相似文献
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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. 相似文献
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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 相似文献
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The DC current-voltage characteristics of strained In0.25 Ga0.75As/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 相似文献
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《Spectrum, IEEE》2002,39(7):32-33
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 相似文献
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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. 相似文献
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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. 相似文献