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IEEE Transactions on Cable Television最新文献

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Be a part 成为一部分
Pub Date : 1980-07-01 DOI: 10.1109/TCATV.1980.285844
Advertisement, IEEE.
广告,IEEE。
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引用次数: 0
A Microprocessor Monitored Feed-Forward Super Trunk CATV Amplifier 一种微机监控前馈型超干线CATV放大器
Pub Date : 1980-07-01 DOI: 10.1109/TCATV.1980.285840
Robert M. Blumenkranz
This paper describes how a Microprocessor can be used to monitor the performance of an ultra low distortion Feedforward Super Trunk Amplifier System. The method described is capable of detecting changes in the loop cancellation of a Feedforward stage that may be caused by deterioration in the hybrid IC. A reduction in the loop cancellation of a Feed-forward stage results in an increase in the distortion level. Through the use of a Head-End Micro Conputer, a signal is sent to a transponder located in each amplifier station which in turn interrogates each RF hybrid IC in the individual Feedforward Amplifier Stages. The relative degree of loop cancellation is indicated at the end of the cascade by monitoring the amplitude of a tone which is generated by introducing modulation into each RF hybrid IC. This tone is observable on any umodulated carrier used for test purposes.
本文介绍了如何使用微处理器来监测超低失真前馈超干线放大器系统的性能。所描述的方法能够检测前馈级的环路消除中的变化,该变化可能由混合IC中的劣化引起。前馈级的环路消除的减少导致失真水平的增加。通过使用头端微型计算机,信号被发送到位于每个放大器站的转发器,该转发器反过来询问各个前馈放大器级中的每个RF混合IC。通过监测通过将调制引入每个RF混合IC而产生的音调的幅度,在级联的末端指示环路消除的相对程度。在用于测试目的的任何未调制载波上都可以观察到这种音调。
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引用次数: 1
IEEE Transactions on Cable Television - Table of contents IEEE有线电视汇刊-目录
Pub Date : 1980-04-01 DOI: 10.1109/TCATV.1980.285802
Presents the table of contents for this issue of the periodical.
介绍这期期刊的目录。
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引用次数: 0
Editorial Comment 编辑评论
Pub Date : 1980-04-01 DOI: 10.1109/TCATV.1980.285804
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引用次数: 0
IEEE copyright form IEEE版权表格
Pub Date : 1980-04-01 DOI: 10.1109/TCATV.1980.285814
Authors must enclose a signed copy of this form when submitting manuscripts to the Editor of this publication.
作者在向本出版物的编辑提交稿件时,必须附上本表格的签名副本。
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引用次数: 0
Blank Page 空白页
Pub Date : 1980-04-01 DOI: 10.1109/TCATV.1980.285812
This page or pages intentionally left blank.
本页故意留白。
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引用次数: 0
Blank Page 空白页
Pub Date : 1980-04-01 DOI: 10.1109/TCATV.1980.285816
This page or pages intentionally left blank.
本页故意留白。
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引用次数: 0
Status Report on EIA Broadband Modem Standards EIA宽带调制解调器标准现状报告
Pub Date : 1980-04-01 DOI: 10.1109/TCATV.1980.285806
Harold W. Katz
Interest in the distribution of data via two-way CATV cable networks has been a topic at NCTA conventions for over ten years. However, only a very limited amount of hardware and associated application software has actually been implemented on CATV systems over this period of time. The technology has, nevertheless, undergone extens-ive development and practical utilization. This activity has taken place primarily in the industrial environment rather th.an within the CATV industry which originally developed the- broadband cable technology. Large scale production plants (in the order of one to two million square feet) recognized the need for an economical medium which. would permit the distribution of high speed data throughout the plant without the need for running individual twisted pairs in conduit. There was also a need for audio and television distribution but to a lesser degree. Various manufact ueers responded to this requirement by developing and marketing data modems to thie industrial and commercial world. In this process each modem vendor and user was utilizing the cable bandwidth in a different manner. The potential conflicts and incompatibilities were becoming evident to the growing number of users and modem vendors. As a result, the Broadband Committee of the EIA (Electronic Industry Association) established in May 1978 a technical committee TR 40.1 to develop standard for industrial and commerical modems which interface to the broadband CATV coax.
对通过双向CATV电缆网络分发数据的兴趣已经成为NCTA会议的一个主题十多年了。然而,在这段时间内,在CATV系统上实际实现的硬件和相关应用软件数量非常有限。然而,这项技术经过了广泛的发展和实际应用。这项活动主要发生在工业环境中,而不是最初开发宽带电缆技术的有线电视行业。大型生产工厂(约100万至200万平方英尺)认识到需要一种经济的介质。将允许在整个工厂中分布高速数据,而不需要在导管中运行单独的双绞线。还需要分发音频和电视,但程度较低。各种制造商响应这一要求,开发并向工业和商业世界销售数据调制解调器。在这个过程中,每个调制解调器供应商和用户都以不同的方式使用电缆带宽。对于越来越多的用户和调制解调器供应商来说,潜在的冲突和不兼容变得越来越明显。因此,EIA(电子工业协会)的宽带委员会于1978年5月成立了一个技术委员会TR 40.1,以开发与宽带CATV同轴电缆接口的工业和商业调制解调器的标准。
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引用次数: 0
Improvement of CATV Transmission Using an Optimum Coherent Carrier System 利用最佳相干载波系统改进CATV传输
Pub Date : 1980-04-01 DOI: 10.1109/TCATV.1980.285809
W. Krick
Aiming at the development of future multichannel CATV-transmission systems the utilization of phase-coherent picture carriers is discussed as a means of reducing intermodulation-and crossmodulation-distortion arising in the line repeater amplifiers. The paper presents experimental and theoretical data for comparison of transmission performance. As a basis the non-coherent operation is reviewed. In order to evaluate the improvement by a coherent system the problem of optimum carrier phase relation is investigated. Experimental results demonstrate the suppression of distortion, if the phases are adjusted according to a certain code which was found by optimization.
针对未来多信道CATV传输系统的发展,讨论了利用相位相干图像载波来减少线路中继器放大器中出现的互调和交叉调制失真的方法。本文提供了用于比较传动性能的实验数据和理论数据。在此基础上,对非连贯性操作进行了审查。为了评估相干系统的改进,研究了最佳载波相位关系问题。实验结果表明,如果根据通过优化找到的特定代码来调整相位,则可以抑制失真。
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引用次数: 7
CATV Application of Feedforward Techniques 前馈技术在有线电视中的应用
Pub Date : 1980-04-01 DOI: 10.1109/TCATV.1980.285811
Bert Henscheid;Patrick J. Birney
Several papers and many articles have been written explaining what feedforward is, but little has been presented on just where such technology should be applied. It is not feasible in just any location, due to inherent operational limits and cost considerations. This paper presents the aspects which must be considered when applying feedforward to CATV systems. Analysis of operation in trunk, super-trunk, bridgers, and distribution positions are given. Conclusions are hypothetical since very little hardware currently exists.
已经写了几篇论文和许多文章来解释什么是前馈,但很少有人介绍这种技术应该应用在哪里。由于固有的运营限制和成本考虑,这在任何地方都是不可行的。本文介绍了在有线电视系统中应用前馈时必须考虑的几个方面。对干线、超干线、桥接器和分布位置的操作进行了分析。结论是假设性的,因为目前硬件很少。
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引用次数: 2
期刊
IEEE Transactions on Cable Television
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