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闭路监控系统安防系统的存在

来源:http://www.wfzhongtebao.com  点击次数:    发布时间:2018-04-09
一.表现层
1. Expression layer
表现层是我们较直观感受到的,它展现了整个安防监控系统的品质。如监控电视墙、监视器、高音报警喇叭、报警自动驳接电话等等都属于这一层。
The presentation layer is most intuitive to us. It shows the quality of the whole security monitoring system. Such as monitoring TV wall, monitor, tweeter alarm horn, alarm automatic answering telephone and so on, all belong to this level.
二.控制层
Two. Control layer
控制层是整个安防监控系统的核心,它是系统科技水平的较明确体现。通常我们的控制方式有两种——模拟控制和数字控制。模拟控制是早期的控制方式,其控制台通常由控制器或者模拟控制矩阵构成,适用于小型局部安防监控系统,这种控制方式成本较低,故障率较小。但对于中大型安防监控系统而言,这种方式就显得操作复杂且无任何价格优势了,这时我们更为明智的选择应该是数字控制。数字控制是将工控计算机作为监控系统的控制核心,它将复杂的模拟控制操作变为简单的鼠标点击操作,将巨大的模拟控制器堆叠缩小为一个工控计算机,将复杂而数量庞大的控制电缆变为一根串行电话线。它将中远程监控变为事实、为Internet远程监控提供可能。但数字控制也不是那么十全十美,控制主机的价格十分昂贵、模块浪费的情况、系统可能出现全线崩溃的危机、控制较为滞后等等问题仍然存在。
The control layer is the core of the whole security monitoring system, and it is the most explicit embodiment of the level of technology in the system. Usually, there are two ways of control -- analog control and digital control. Analog control is an early control method, and its console is usually composed of controller or analog control matrix. It is suitable for small local security monitoring system. This control mode is low cost and the failure rate is small. But for the medium and large security monitoring system, this way is complicated and has no price advantage, and we should be more wise to choose digital control. Digital control is the core of the control computer as the control system. It turns the complex simulation control operation into a simple mouse click operation, and reduces the huge analog controller stacking to a industrial computer, and turns a complex and large number of control cables into a serial telephone line. It turns the middle and long distance monitoring into reality and provides a possibility for Internet remote monitoring. But the digital control is not so perfect, the price of controlling the host is very expensive, the waste of the module, the crisis of the whole line collapse, the lag of the control and so on still exist.
三.处理层
Three. Processing layer
处理层或许该称为音视频处理层,它将有传输层送过来的音视频信号加以分配、放大、分割等等处理,有机的将表现层与控制层加以连接。音视频分配器、音视频放大器、视频分割器、音视频切换器等等设备都属于这一层。
The processing layer may be called the audio and video processing layer, which will have the audio and video signals sent by the transmission layer to be distributed, magnified, segmented and so on, and organically connect the presentation layer with the control layer. Audio and video distributor, audio and video amplifier, video segmentation device, audio and video switcher and so on belong to this layer.
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四.传输层
Four. Transport layer
传输层相当于安防监控系统的血脉。在小型安防监控系统中,我们较常见的传输层设备是视频线、音频线,对于中远程监控系统而言,我们常使用的是射频线、微波,对于远程监控而言,我们通常使用Internet这一廉价载体。值得一提的是,新出现的传输层介质——网线/光纤。大多数人在数字安防监控上存在一个误区,他们认为控制层使用的数字控制的安防监控系统就是数字安防监控系统了,其实不然。纯数字安防监控系统的传输介质一定是网线或光纤。信号从采集层出来时,就已经调制成数字信号了,数字信号在目前已趋成熟的网络上跑,理论上是无衰减的,这就保证远程监控图像的无损失显示,这是模拟传输无法比拟的。当然,高性能的回报也需要高成本的投入,这是纯数字安防监控系统无法普及较重要的原因之一。
The transmission layer is equivalent to the blood of the security monitoring system. In the small security monitoring and control system, our most common transmission layer equipment is video line and audio line. For medium and remote monitoring system, we often use radio frequency and microwave. For remote monitoring, we usually use Internet as a cheap carrier. It is worth mentioning that the new transport layer media -- netwire / fiber. Most people have a misunderstanding on the digital security monitoring. They think that the digital control system used by the control layer is the digital security monitoring system, but it is not. The transmission medium of pure digital security monitoring system must be wire or optical fiber. When the signal comes out from the acquisition layer, the signal has been modulated into a digital signal. The digital signal is running on a mature network. In theory, there is no attenuation in theory. This ensures the loss of the remote monitoring image, which is unparalleled in analog transmission. Of course, high performance return also requires high cost investment, which is one of the most important reasons why the pure digital security monitoring system can not be popularized.
五.执行层
Five. Executive layer
执行层是我们控制指令的命令对象,在某些时候,它和我们后面所说的支撑诚、采集层不太好截然分开,我们认为受控对象即为执行层设备。比如:云台、镜头、解码器、球等等。
The executive layer is the command object that we control the instruction, and at some time, it is not very well separated from the support and the acquisition layer that we say behind. We think that the controlled object is the executive layer device. For example: Yuntai, lens, decoder, ball and so on.
六.支撑层
Six. Support layer
顾名思义,支撑层是用于后端设备的支撑,保护和支撑采集层、执行层设备。它包括支架、防护罩等等辅助设备。
As the name implies, the supporting layer is used for supporting the back-end devices, protecting and supporting the collection layer and execution layer devices. It includes support, protective cover and other auxiliary equipment.
七.采集层
Seven. Collection layer
采集层是整个安防监控系统品质好坏的关键因素,也是系统成本开销较大的地方。它包括镜头、摄像机、报警传感器等等。
Collection layer is the key factor of the quality of the whole security monitoring system, and it is also the most expensive part of the system cost. It includes lens, video camera, alarm sensor and so on.
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