Design ideas of DVR

★Operation on DVR
  
  I come into contact with domestic twenty or thirty kinds of DVR products and have found that a considerable portion, including PC-type DVR and stand alone DVR products ,are too cumbersome in the operation and use, for example: Many products will operate smoothly only after the users understanding all the parameters clearly and making the corresponding settings, and some are the options which are designed for achieve some kind of function by manufacturers, users must understand them clearly, do not select and will not work; and many parameters are used all together will leads to the application results without users’ expectation.

   The most of users are unfamiliar with DVR, and are terrified of it, therefore complicated operation on DVR will make DVR more daunting to look at for the users. The most important for DVR manufacturers is to take into account the user′s thinking and operation practice, some large companies abroad have special organization to learn the use and operation practice of specific product for different groups of people; at home will also have DVR manufacturers before they are officially released, according to the development process, grading requests the user to do test about  operation on the new products , during the test note operational track and tendency of the testers to find a shortcut to operation and standardize operational process, excluding completely contrary thinking tendency, to seek to make the operation as simple as possible. Technology products themselves should brought people high-efficiency and quick life and work way, design idea should be "people-based", so improve the operational using mode is an important part of improving the DVR.

★About stability of DVR
 
  Stability and reliability of DVR products is a more complex issue, which refers to many aspects including hardware, software, human damage, error operation, outside interference and so on. Some people refer to poor reliability of DVR products mainly refers to the crash phenomenon of DVR. On this problem, you can make some analysis on DVR.

  Speaking from the hardware, PC is a universal and maturely designed product, each part of which has strict technical standards and quality certification. Therefore, as long as each part of DVR is carefully selected, which can absolutely ensure the high quality of all hardware on the machine.

  For the operating system software, it have been in use for so many years by so many users and continually modified and upgraded, it should be said that general-purpose operating system is basically stable. Of course, there are indeed the questions that too much application functionality for DVR and risk of infection with the virus and so on. Therefore, the design of application software can take into account masking the other features in the operating system having nothing to do with the DVR, which makes the computer boot directly into the monitoring system, directly off if exit monitoring system, and in the monitoring system operation, the users can not easily access the operating system interface. This changes a generic PC into a DVR machine specially used for the monitoring system, thereby ensuring the reliability of system software to run.
  In addition, through close FD and CD driver you can prevent the virus from intrusion. Through these measures can greatly improve the DVR system stability. 

★About HD
 
  HD is a key parts of the whole system, its stability and reliability is directly related to the stability of the whole system operation and security of stored data, therefore must carefully select HD and disk arrays. After installing HD the problems on cooling system are the key issues that should be solved, HD works under high temperature conditions, which will greatly shorten its life, so that HD error rate increased greatly. Need to design the function of automatic HD management for the monitoring software, whether HD tracks are damaged or HD is added, all enable the system to operate smoothly.

  The average trouble-free working hours of hard disk are generally more than 30 thousand hours, but its start / stop times is generally 3 to 5 million times according to manufacturer’s standard. For the DVR system, it may continually work for a long time, it is best that no shutdown. But the DVR software is designed for being automatically and periodically reset once a week by system by manufacturers, to restore its performance. In the project requires the ability to configure the UPS uninterruptible power supply to prevent system monitoring interruption which caused by a sudden power outage from resulting in HD and software damage, which is also an important measure of protection. If periodically scan the disk during the maintenance to repair bad sectors soft fault, then it is also very useful for the system. In general, continuous-working HD under normal condition is competent in 3 to 5 years time.

★About system resources occupation

  Images recording and playback of DVR need to take up a large number of CPU resources in general, especially when operate several task-both video recording and playback, at the same time, make network transmission. So when design hardware and application software of DVR equipment should noted that the time that CPU occupies is no more than 80%, otherwise the system will appear stagnancy, even a variety of phenomena like crash. In order to make DVR high-efficiency and stable, should select hardware compression card with DSP processing chip as the core, so that system resources are occupied less and smaller burden, thus make the system more stable.

★About network connection
 
  Image transmission to a great extent dependents on the network environment, if the network itself is often packet loss, failure or bandwidth fluctuated, the image transmission is very prone to problems, when design network monitoring systems, should consider the use of handshake and detection mechanism, users choose the main-control images that they need to transmit at the sub-control side of the network, after main-control side receives the demand of the sub-control side send the corresponding data stream, thus keeping useless data stream from occupying bandwidth resources , to give the user the appropriate prompt under the condition that the network is unreasonable or a failure, reminding users to the network itself problem.
 
★About anti-virus function
 
  On the side a common problem refers to network viruses invading impact the steady use of DVR, so when design to take DVR has enough anti-virus destructive power into account, means that under the condition that virus is present can continue to use the DVR monitoring program, of course, check and kill virus in time is also very necessary.