共查询到20条相似文献,搜索用时 46 毫秒
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机卡绑定制式限制了中国数字电视产业规模的形成。为解决这一问题,设计了以USB为接口的新型机卡分离方案和条件接收模块(CAM)。在条件接收模块中应用了指纹识别技术,进一步增加了条件接收的安全性,最终完成了条件接收系统与机顶盒的分离。 相似文献
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机卡分离是必然趋势围的水平市场,机卡分离是数字电视产业发展到一定阶段的必然趋势。目前,C A M卡支持数字电视的实现机卡分离后,数字电视接收机在不同的地方接收不同加密(C A)节目只需换C A M卡,打通了全国范三种收看方式:数字电视一体机、机卡分离机顶盒和数字电视接收卡,后者可在计算机上直接欣赏高画质的数字有线电视,是家庭数字电视副机的新选择。为什么只进行CA的分离?为什么要进行C A的分离,而不是对E P G、数据广播进行分离?这是经常被提起的一个问题。这是因为,CA是实现付费节目管理的关键系统,具有极高的安全性要求。为了… 相似文献
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将机顶盒与CA(条件接收)系统分离,是数字电视发展的必然趋势。本文介绍了数字电视机顶盒机卡分离的几种实现方案。重点介绍采用DVB-CI接口标准及其在机顶盒上的实现,以及在此接口上的高层应用。 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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A. M. Emel’yanov 《Semiconductors》2010,44(9):1134-1139
A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of
the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption
edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of
determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting
radiation from the sample. 相似文献
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“计算机组成原理”设计性实践教学模式研究 总被引:1,自引:0,他引:1
本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨. 相似文献