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本文以2021年中央广播电视总台春晚高清直播系统为中心,介绍了视频系统架构如何实现春晚的技术需求,以及直播中的技术保障方案等. 相似文献
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在许多数字系统中,特别是用微机控制的数字系统,往往需要对脉冲的宽度、频率、上升时间等参数进行检测,将检测结果送入计算机进行处理。本文是对上述几种脉冲参数分别进行检测的逻辑电路。一、脉冲宽度检测电路该电路用来检测输入脉冲宽度t_k是否符合指标要求.在频率4kHz,幅度5v,上升时间20ns时、可检测脉冲宽度指标为0.25μs±0.0255s的脉冲。 相似文献
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In the time order, the author proposes that the discovery and development of the periodic table of chemical elements are divided into four stages:point→1D→2D→3D. This article cites the main historical facts and documents available to unscramble the above four stages, which will facilitate the teaching and scientific research of the periodic table. 相似文献
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2018央视春晚连续第三年采用1个主会场4个分会场的格局,本文主要介绍了春晚主会场视频系统设计,对4K节目素材的同步生产、各摄像机的具体配置,4K信号制作流程、与各分会场的信号通讯等进行了说明,总结了春晚直播视频系统的亮点,并从供电、切换面板操作、大屏系统、监看系统等方面对应急备份措施和应急预案进行了介绍。 相似文献
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南京电视台新闻网已稳定运行,鉴于网内建有新闻内嵌媒资模块,已将现有媒资模块扩建为全台共享媒资.为了迎合广电行业的发展,实现台内资源的经营管理是目前探索的主要方向.新闻内嵌媒资改建为共享交换型媒资后,向经营服务型媒资并向云媒资转变已迫在眉睫. 相似文献
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By the statistical entropy of the Dirac field of the static spherically symmetric black hole, the result is obtained that the radiation energy flux of the black hole is proportional to the quartic of the temperature of its event horizon. That is, the thermal radiation of the black hole always satisfies the generalised Stenfan--Boltzmann law. The derived generalised Stenfan--Boltzmann coefficient is no longer a constant. When the cut-off distance and the thin film thickness are both fixed, it is a proportional coefficient related to the space--time metric near the event horizon and the average radial effusion velocity of the radiation particles from the thin film. Finally, the radiation energy fluxes and the radiation powers of the Schwarzschild black hole and the Reissner--Nordstrõm black hole are derived, separately. 相似文献