Comparison between analog monitoring system and digital monitoring system

The analog monitoring system is an analog series with video matrix, splitter, and recorder as the core, supplemented by other sensors.
The traditional analog closed-circuit television monitoring system has its limitations:
First, the traditional video signal is an analog signal, and the transmission of the video signal is usually transmitted through coaxial cable.
In a short distance, such as 200-300 meters, the attenuation of the video signal is very small; if it exceeds a certain distance, a video amplifier is needed
to amplify the video signal. Usually, adding a first-level amplifier can extend the transmission distance by about 200 meters. However, in the project, if
the video signal is amplified in two stages, the image will be obviously distorted. In severe cases, the image will be distorted and even black horizontal stripes will appear. Therefore,
the conventional video monitoring system is only suitable for use in one building or a certain range.
Second, the analog monitoring system can only transmit one video signal on one coaxial cable. If data signals,
control signals or audio signals need to be transmitted, cables must be laid separately. At the same time, with the changes and increases in monitoring points and monitored points,
cables must be laid separately, which is expensive. Moreover, the image quality of analog monitoring is poor during long-delay recording, which is not conducive to retrieval.
Third, the advantage of analog monitoring system is that the image quality is well maintained within a certain distance. To
transmit multiple video and audio signals over long distances, with high definition and synchronous transmission, the most economical and feasible method is to digitize the analog signal, compress and encode it, and
transmit it using public or dedicated communication lines.
Fourth, from the perspective of transmission device type, the transmission of video image signals can be divided into
two categories: dedicated transmission equipment and computer network transmission. The former includes video transmission equipment connected to dedicated lines or public communication lines, including coaxial cables, telephone lines or
optical fibers, dedicated video image transmitters and image receivers, microwave and satellite communication equipment, etc. This method was developed in the late 1970s and
early 1980s; while the latter transmits video images through the existing widely distributed computer networks and digital multimedia technology
. This method is currently developing rapidly with the rapid popularization of Internet technology around the world.
This method will also become a standard for future video monitoring systems.
Finally, wired analog video signals can only use dedicated mechanical video recorders and magnetic video tapes. These devices require
professional repair and maintenance. The tapes have a limited number of uses, a short storage period, and are prone to magnetization, deformation, and mold. The storage, query and editing of one year's data
takes up a lot of space and time. Long-term use will bring a heavy burden to customers, and it is very cumbersome to query and collect evidence.
Digital monitoring system

First, compared with analog monitoring, digital monitoring has obvious technical advantages. As a
high-tech product that applies computer digital video compression and transmission technology to the field of image monitoring, the working principle of digital monitoring equipment is: the computer converts analog video signals into digital
information to complete the collection, browsing, transmission, storage and playback of video information. Moreover, the computer can also receive various alarm information,
output relay control information, and automatically perform various alarm linkage operations according to pre-programmed programs. The digital monitoring system uniformly manages the various contents involved, such as
video monitoring, pan-tilt control, image movement detection, alarm signal input, relay control signal output, alarm linkage operation, etc.
, and has a good human-computer interaction interface. Digital monitoring also supports PSTN, ISDN, DDN, microwave and internal LAN access. Any workstation in the network can become a sub-control station after authorization, realizing multi-level sub-control, and effectively improving
the comprehensive processing ability of emergencies. Secondly, the monitoring system makes the alarm layout more reasonable through computer intelligent management. Computers make security work orderly and avoid any omissions. On the basis of making full use of multimedia features, combined with real-time capture, video alarm and other technologies, prevention work is safer and more thorough, which has a huge deterrent effect on criminals and can prevent crimes more effectively. Strict computer monitoring tracks and records every scene of the incident in real time, which is convenient for evidence collection and can more effectively combat crime.
Finally, the use of digital monitoring systems can reduce the intensity of security. Security work seems simple, but it is tedious and arduous, and the responsibility is heavy.
The high intelligence of the digital monitoring system further frees security personnel from boring work, while improving safety and reducing work intensity; powerful network functions save the hard work of leaders in safety inspections; combined with advanced programming theory, a
good and friendly operating interface, it is more conducive to human-machine cooperation monitoring and improves safety.

Performance comparison between digital monitoring system and analog monitoring system
Table 1 shows the comparison between traditional analog monitoring system and digital monitoring system. From the data in the table, we can clearly see
the advantages of the latter. Digital monitoring is the newest and most leading product in the world today. It has made a big step forward in the monitoring field from analog to digital. This is an irreversible trend and a revolutionary leap in the monitoring field.