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闭路电视(CCTV)作为一种图象通信,由于它的直观性、确切性和高效率,是任何其他通信(例如语音通信)无法比拟的,因此早在70年代已在地铁运营管理中得到了应用。 但是,由于当时的技术水平、特别是设备性能的限制,应用效果并不理想,甚至使人产生疑问。到了80年代、特别是90年代,由于摄像技术、视频传输技术的提高,闭路电视在地铁的应用取得了满意的效果,得到了人们的肯定,现在无论是设备和方案都已逐渐趋于成熟。
Closed-circuit television (CCTV), as an image communication, was already in operation and management of the subway as early as the 1970s because of its unobtrusiveness, accuracy and efficiency that any other communication (such as voice communication) application. However, due to the technical level of the time, especially the limitation of equipment performance, the application effect is not ideal, or even cause for doubt. By the 80s, especially in the 90s, the application of CCTV in the subway has achieved satisfactory results due to the improvement of camera technology and video transmission technology. People are sure of it. Now both the equipment and the solutions have gradually become mature.