- 1、本文档共7页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
- 5、该文档为VIP文档,如果想要下载,成为VIP会员后,下载免费。
- 6、成为VIP后,下载本文档将扣除1次下载权益。下载后,不支持退款、换文档。如有疑问请联系我们。
- 7、成为VIP后,您将拥有八大权益,权益包括:VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
- 8、VIP文档为合作方或网友上传,每下载1次, 网站将根据用户上传文档的质量评分、类型等,对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档
查看更多
双绞线、同轴电缆、光纤的区别及如何使用(国外英文资料)
双绞线、同轴电缆、光纤的区别及如何使用(国外英文资料)The difference between twisted pair, coaxial cable and optical fiber and how to use.TxtThe difference between twisted pair cable, coaxial cable and optical fiber and how to use themRelease time: 2010-3-29 source: China Wire Cable Network1 coaxial cableThe coaxial cable has the advantages of low cost, convenient laying (relative to the optical fiber), so the general monitoring system in small range, the transmission distance is very close, the use of coaxial cable transmission directly monitoring image with little damage on the image quality, can satisfy the actual request.However, according to the analysis of the coaxial cables own characteristics, when the signal is transmitted in coaxial cable, its attenuation is related to the transmission distance and the frequency of the signal itself. Generally speaking, the higher the signal frequency, the greater the attenuation. Video signal bandwidth is large, up to 6MHz, and the color image part is modulated at high frequency, so that the video signal transmission in a coaxial cable not only signal amplitude of each frequency component is attenuated and the attenuation varies greatly, especially the color part of the maximum attenuation. Therefore, coaxial cable is only suitable for transmitting image signals at short distance. When the transmission distance is about 200 meters, the image quality will decrease obviously, especially the color becomes dim and distorted.In engineering practice, coaxial amplifiers are used to extend transmission distances. The coaxial amplifier has a certain amplification to the video signal, and also can compensate different frequency components with different sizes by balanced adjustment, so that the video signal produced by the receiver is as small as possible. However, the coaxial amplifier cannot limit and cascade, generally in a coaxial point-to-point system amplifier can only cascade 2 to 3, otherwise it is impossible to ensure the quality of video transmiss
您可能关注的文档
最近下载
- 金川集团2024笔试题库及答案.pdf
- 2025安徽宿州市灵璧县城区中小学选调教师193人笔试备考试题及答案解析.docx VIP
- 浅谈国际EPC总承包项目文控管理工作.docx VIP
- 药事管理学药品注册管理课件.ppt VIP
- 《肩袖损伤与肩周炎》课件.ppt VIP
- 2024年重庆市巴蜀中学初升高自主招生语文试卷真题(含答案).docx VIP
- 中介新房培训课件内容.ppt VIP
- 2024年重庆渝中区重庆市巴蜀中学自主招生数学试卷(初升高保送)(详解版).pdf VIP
- 2025年西藏自治区公务员录用考试面试真题试卷(结构化小组)题型分析.docx VIP
- 药品注册管理课件.ppt VIP
文档评论(0)