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随着综合布线系统的广泛应用,人们需要用PDS(PremisesDisribution System)中的双绞线来传输视频图象信号和音频信号等不平衡信号。本文中介绍的视频信号平衡发送器就是把视频设备输出的阻抗为75Ω、幅度V_(p-p)为1V的复合视频信号,转换为输出阻抗为100Ω(UTP)的对地平衡信号,通过双绞线传输平衡信号,在接收端再把平衡信号转换成标准的复合电视信号输出,完成信号传输。该电路已在监控工程应用,获得满意的效果。
With the widespread use of integrated wiring systems, people need to use twisted pairs in PDS (Premises Discrimination System) to transmit unbalanced signals such as video image signals and audio signals. The video signal balance transmitter introduced in this paper converts the composite video signal with the impedance of 75Ω and V_ (pp) of 1V outputted by the video equipment into the balanced signal with the output impedance of 100Ω (UTP) through the twisted pair Transmit balanced signal, and then balance the signal at the receiver into a standard composite television signal output to complete the signal transmission. The circuit has been monitoring engineering applications, access to satisfactory results.