Main Feature of Vehicle HDD Mobile DVR The Purchase Standard Of Car Video Recorder MDVR

   HDD MDVR system is widely used for all kinds of vehicle security projects, like in buses, trucks, taxi, carrier vehicles, etc, which enable users to use a mobile phone and PC to have a live view of vehicle tracking and video surveillance, quite beneficial for fleet management and safe driving.

   Today in-vehicle video surveillance system market there normally have 4 channels, 8 channels, 12 channels, and 16 channels Mobile DVRs, including SD card MDVR and HDD MDVR.All those MDVR systems can work with various sensors to provide multi-functions for different vehicles projects.

1.Vibration resistance

   Although the embedded system is the same as the common DVR, the HDD MDVR technology is more complex than the common DVR, and the key to be solved is different. Therefore, they are two completely different concepts. Vehicle HDD MDVR is applied to moving vehicles. Due to different vehicle conditions and road conditions, the vibration is relatively large, which has a great impact on reading and writing data of hard disks and causes great damage to equipment. Therefore, seismic technology has become the most basic requirements for vehicle HDD MDVR. At present, mainly on the whole machine damping, hard disk frame damping, hard disk damping and other measures.

   In the security industry, the vehicle HDD MDVR market is still relatively chaotic and the user's understanding is not deep. Therefore, it is often found that ordinary DVR can be disguised as HDD MDVR. Accordingly, specific and actual effect needs oneself to examine ability to know personally.

2.Stability of power supply

   Voltage stability is another important technology of vehicle HDD MDVR. Because in the process of driving, the vehicle will have ignition, braking, stepping on the accelerator and other actions, these behaviors will make the output voltage of the vehicle have different amplitude fluctuation, it is easy to cause the vehicle HDD MDVR burn out. Therefore, the vehicle HDD MDVR must have a wide voltage input capacity to adapt to this voltage change. At present, a wide voltage of 6 ~ 36V is usually used to meet the needs of mobile vehicles.

   At the same time, it should also be noted that if the vehicle suddenly flameout in a collision and the vehicle power is cut off, the HDD MDVR at this time should have the function of automatic power protection to ensure that the data in the hard disk will not be lost.

3.Heat dissipation of vehicle HDD video recorder MDVR

   Due to the vehicle in the process of running, affected by the environment, weather, temperature change is relatively large.This puts forward a high demand on the heat dissipation performance of vehicle HDD DVR.Therefore, if the heat dissipation performance is not good, the life of the product will be reduced, and the monitoring effect will be affected. At present, some products are cooled by fans, some are cooled by the body. Therefore, when buying, it is best to run for a period of time, then measure the body temperature, and see the actual effect of the image.

4.image resolution

   Image resolution directly affects the monitoring effect, so when buying a product, it depends on what kind of processing chip the product is using, what kind of compression format, what resolution is supported? Currently, the product supports CIF to D1 recording and CIF transmission. To see the actual effect, you need to record a video at different resolutions and observe the playback effect, whether the picture is clear and whether there is a delay.

5.The firmness of the device interface

   In the car, due to braking, acceleration, or bumpy road, etc., will lead to a large vibration of the equipment. If the interface is not firm, the wiring may fall off at any time, resulting in image jitter, video loss, power loss. Therefore, when buying a product, you should carefully observe whether the interface is solid. We have seen in the testing process, when we concentrated most of the interfaces on the rear panel, replaced by a multi-pin interface, and then bundled all the data cables into a bundle, which played a very good role in the stability of the interface.

6.Wireless transmission

   In addition to providing local video and forensics data,vehicle HDD MDVR also needs to send the obtained video information back to the control center in time, so that the control center can timely understand the vehicle situation and centralized management. Therefore, wireless transmission is particularly important. At present, it mainly uses mobile GPRS and UNICOM's CDMA network, but due to the problem of bandwidth and cost, it can not achieve real-time transmission, only 5~7 frames under the CIF format can be transmitted in one second. Therefore, the user can check whether the picture transmitted back from the control center is clear and smooth.