[ Huaqiang Security Network News ] In order to choose a DVR suitable for your own use, you must first understand the manufacturers that meet the requirements, and make preliminary judgments according to the product introduction provided by the manufacturer. Of course, the most important thing is to choose according to your own needs. This is the pragmatic choice of your own products. In the process of selecting a DVR, you need to pay attention to the following points: 
1, the image clarity <br> The higher the image clarity, the larger the disk storage space occupied, the higher the required network transmission bandwidth. Therefore, it is the best design that allows the user to adjust the design according to the actual situation. Therefore, the user chooses the product that suits the user according to the actual situation of the (project), which is the rational practice of the engineering firm.
2, image real-time <br> For the video rate, in fact, all DVR in real-time state is 25 screen / sec (PAL format) or 50 map / sec (PAL format), any advertising beyond this indicator It is unrealistic. It should also be noted that to observe the real-time nature of the moving picture, observe whether there is delay and smear, and observe what the highest code stream is.
3, compression algorithm <br> At present, H.264 compression algorithm has not really achieved high compression ratio, and the real H.264 algorithm has a certain gap, but it is currently the most ideal compression algorithm.
4, network function <br> When checking the network function, not only to check whether the product provides an Ethernet network interface, but also to see whether to provide a centralized monitoring and management system software, real control of the DVR through the network.
5, alarm linkage
The DVR must have an alarm and linkage interface, and related records of the event, such as the location, date, time, user address, name, phone number, unit name, alarm category, etc.; once transmitted to the center, due to the control system between the units The transfer time function relationship requires that the data for a period of time before the alarm signal is received be retained to facilitate the process analysis in the future forensics.
6, storage and backup <br> In addition to regular backup, network backup is also a more feasible backup method. Therefore, the engineering company should pay attention to the storage and backup performance of the DVR equipment when purchasing.
7. Convenience of operation <br> Be sure to experience it yourself when you purchase. First, pay attention to whether the design and layout of the buttons on the front panel of the DVR device are clear, and whether the marking of each button is clear. The second is to see if the software menu is intuitive and friendly, and whether it is convenient for users to set up and browse. The third is to see whether the embedded DVR supports multiple operating modes such as mouse and remote control.
8, video reliability and security
9, the convenience of video retrieval
10, product cost performance
2, image real-time <br> For the video rate, in fact, all DVR in real-time state is 25 screen / sec (PAL format) or 50 map / sec (PAL format), any advertising beyond this indicator It is unrealistic. It should also be noted that to observe the real-time nature of the moving picture, observe whether there is delay and smear, and observe what the highest code stream is.
3, compression algorithm <br> At present, H.264 compression algorithm has not really achieved high compression ratio, and the real H.264 algorithm has a certain gap, but it is currently the most ideal compression algorithm.
4, network function <br> When checking the network function, not only to check whether the product provides an Ethernet network interface, but also to see whether to provide a centralized monitoring and management system software, real control of the DVR through the network.
5, alarm linkage
The DVR must have an alarm and linkage interface, and related records of the event, such as the location, date, time, user address, name, phone number, unit name, alarm category, etc.; once transmitted to the center, due to the control system between the units The transfer time function relationship requires that the data for a period of time before the alarm signal is received be retained to facilitate the process analysis in the future forensics.
6, storage and backup <br> In addition to regular backup, network backup is also a more feasible backup method. Therefore, the engineering company should pay attention to the storage and backup performance of the DVR equipment when purchasing.
7. Convenience of operation <br> Be sure to experience it yourself when you purchase. First, pay attention to whether the design and layout of the buttons on the front panel of the DVR device are clear, and whether the marking of each button is clear. The second is to see if the software menu is intuitive and friendly, and whether it is convenient for users to set up and browse. The third is to see whether the embedded DVR supports multiple operating modes such as mouse and remote control.
8, video reliability and security
9, the convenience of video retrieval
10, product cost performance
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