千家论坛_智能建筑与智能家居技术交流社区
标题:
关于宽频共缆监控传输系统技术
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作者:
zhangym624
时间:
2007-4-16 10:02
标题:
关于宽频共缆监控传输系统技术
<span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">现有监控传输有哪几种方式，各有什么优缺点？</span>
作者:
zhangym624
时间:
2007-4-16 10:02
<span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">有视频基带传输、光纤传输、网络传输、微波传输、双绞线平衡传输、宽频共缆传输六种传输方式。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/> </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">①</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">
</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">视频基带传输：是最为传统的电视监控传输方式，对</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">0~6MHz</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">视频基带信号不作任何处理，通过同轴电缆（非平衡）直接传输模拟信号。其优点是：短距离传输图像信号损失小，造价低廉。缺点：传输距离短，</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">300</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">米以上高频分量衰减较大，无法保证图像质量；一路视频信号需布一根电缆，传输控制信号需另布电缆；其结构为星形结构，布线量大、维护困难、可扩展性差。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">
<br/> </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">②</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">
</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">光纤传输：常见的有模拟光端机和数字光端机，是解决几十甚至几百公里电视监控传输的最佳解决方式，通过把视频及控制信号转换为光信号在光纤中传输。其优点是：传输距离远、衰减小，抗干扰性能最好，适合远距离传输。其缺点是：对于几公里内监控信号传输不够经济；光熔接及维护需专业技术人员及设备操作处理，维护技术要求高，不易升级扩容。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/> </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">③</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">
</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">网络传输：是解决城域间远距离、点位极其分散的监控传输方式，采用</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">MPEG</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">音视频压缩格式传输监控信号。其优点是：采用网络视频服务器作为监控信号上传设备，有</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">Internet</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">网络安装上远程监控软件就可监看和控制。其缺点是：受网络带宽和速度的限制，只能传输小画面、低画质的图像；每秒只能传输几到十几帧图像，动画效果十分明显并有延时，无法做到实时监控。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/> </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">④</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">
</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">微波传输：是解决几公里甚至几十公里不易布线场所监控传输的解决方式之一。采用调频调制或调幅调制的办法，将图像搭载到高频载波上，转换为高频电磁波在空中传输。其优点是：省去布线及线缆维护费用，可动态实时传输广播级图像。其缺点是：由于采用微波传输，频段在</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">1GHz</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">以上常用的有</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">L</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">波段（</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">1.0~2.0GHz</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">）、</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">S</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">波段（</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">2.0~3.0GHz</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">）、</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">Ku</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">波段（</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">10~12GHz</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">）</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">,</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">传输环境是开放的空间很容易受外界电磁干扰；微波信号为直线传输，中间不能有山体、建筑物遮挡；</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">Ku</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">波段受天气影响较为严重，尤其是雨雪天气会有严重雨衰。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/> </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">⑤</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">
</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">双绞线传输（平衡传输）：是解决监控图像</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">1Km</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">内传输，电磁环境复杂场合的解决方式之一，将监控图像信号处理通过平衡对称方式传输。其优点是：布线简易、成本低廉、抗共模干忧性能强。其缺点是：只能解决</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">1Km</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">以内监控图像传输，而且一根双绞线只能传输一路图像，不适合应用在大中型监控中；双绞线质地脆弱抗老化能力差，不适于野外传输；双绞线传输高频分量衰减较大，图像颜色会受到很大损失。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/> </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">⑥</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">
</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">宽频共缆传输：是解决几公里至几十公里监控信号传输的最佳解决方案，采用调幅调制、伴音调频搭载、</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">FSK</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">数据信号调制等先进技术，可将四十路监控图像、伴音、控制及报警信号集成到</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">“</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">一根</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">”</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">同轴电缆中双向传输。其优点是：充分利用了同轴电缆的资源空间，四十路音视频及控制信号在同一根电缆中双向传输、实现宽频共缆</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">“</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">一线通</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">”</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">；施工简单、维护方便，大量节省材料成本及施工费用；频分复用技术解决远距传输点位分散，布线困难监控传输问题；射频传输方式只衰减载波信号，图像信号衰减很小，亮度、色度传输同步嵌套，保证图像质量达到</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">4.5</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">级以上国家标准；采用</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">75Ω</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">同轴不平衡方式传输使其具有非常强抗干扰能力，电磁环境复杂场合仍能保证图像质量。其缺点是：采用弱信号传输，宽频调制端需外加</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">AC220V</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">交流电源，但目前大多监控点都具备这个条件。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/> </span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">综合以上几种传输技术，解决几公里甚至几十公里内监控信号传输应选用宽频共缆传输方式，宽频共缆传输方式布线简洁、扩展灵活、性价比高、集成性强，可集成图像、伴音、控制及报警信号于</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">“</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">一根</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">”</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">电缆，实现了监控信号传输的里程式跨越。</span>
作者:
heml
时间:
2007-4-17 10:59
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