As early as the early 1980s, people began to have the awareness of on-board monitoring and started installing video equipment in the car. Later, with the development of science and technology, analog car-borne video recorders emerged. This type of video recorder passed analog signals. To record and save the operation status of the vehicle, the computer cannot set parameters, manage and query it, and the video recording time of the video tape is limited. In the running of the vehicle, the video tape must be replaced constantly, which brings inevitable storage. The trouble ... ... So, car DVR came into being.

The so-called car DVR, which uses a standard 1U architecture, is installed in the location of a radio or CD player in a public transportation vehicle, and is connected to 1-4 road images to monitor and record the situation in the vehicle. The compression algorithm currently used in on-board DVRs. Mainly MPEG4 and H. 264.

Manufacturers have a good name for this kind of embedded DVR applied in the car, MDR or MVR (Mobile digital recorder or Mobile video recorder). Thus, "Mobile" has become the biggest difference between a car DVR and an ordinary DVR. It is precisely because of the mobility of the vehicle-mounted DVR that it provides good conditions for the safety monitoring of the vehicle in the moving process.

Isn't an ordinary surveillance DVR able to be used in a car? the answer is negative. Although embedded systems are adopted in the same way as ordinary DVRs, car DVR technology is more complex than ordinary DVRs, and the key to demand resolution is also different. Because the vehicle in the process of moving, will inevitably be subject to vibration, dust, power supply and other issues, these are destined to the application environment of the car DVR is more severe than ordinary DVR.

The bad environment inside the car and the combination of multiple technologies “stabilize” to win the game. It is understood that in order to ensure that the bus can still be stored smoothly during operation, manufacturers’ enhanced technologies for vehicle-mounted DVRs mainly include anti-shock, stabilized current, heat dissipation, and wireless. Transmission and so on. The perfect combination of these technologies is to further improve the stability of the car DVR storage.

Shock absorption Due to differences in vehicle conditions and road conditions, shockproof technology has become the most basic requirement for on-vehicle DVRs, including vibration reduction of the entire machine, shock absorption of hard disk drives, and shock absorption of hard disks, etc., to achieve the entire vehicle-mounted DVR. Shock absorption treatment.

In these shock absorption sections, the shock absorption of the hard disk is a top priority. This is because the hardest damaged components in a car DVR are hard disks. If the hard disk is damaged, it cannot be stored in the car. Therefore, the problem of shock absorption of the hard disk is particularly important.

For the current method of shock absorption, most of the current market uses springs and rubber pads as the structure of shockproof materials. Although it can play a certain role in the vertical direction of force, it is actually in the driving state (especially in bad road conditions. Below) The vibration direction is irregular, and long-term use will inevitably lead to equipment failure. Springs and rubber mats do not absorb the energy of vibrations. Instead, they store the energy. When it reaches a certain level, it will cause a greater rebound. According to him, at present, there is a practice of refueling bladders in rubber mats. The main advantage is to use oil's advantages of less compression than air to achieve better shock absorption.

In addition, there are some manufacturers also have a design for the suspension of the hard disk suspension suspension or chassis suspension suspension for vehicle DVR, the hard disk or the entire chassis to achieve "floating" state, in order to achieve shock absorption.

In addition to the damping of the regulated power supply, another important technology in the onboard DVR is the stability of the power supply. As the vehicle is in the running process, the vehicle will have brakes, climbing, ignition and other actions, this behavior will cause the vehicle output voltage to produce different amplitude fluctuations, it is easy to cause the phenomenon of burning the vehicle equipment, so the vehicle-mounted DVR itself must have Wide voltage input capability to accommodate this voltage change.

Heat dissipation It is understood that during the operation of the bus, there will be characteristics of large temperature changes, many buses are installed in the driver seat or the top of the driver's seat closed space on the car DVR, which on the car DVR The use of performance puts forward higher requirements.

However, some people in the industry believe that because the national and local governments have specific requirements and related documents for GPS positioning systems, many transportation companies have mandatory GPS positioning systems. Therefore, the GPS functions added by vehicle-mounted DVRs are more in line with buses. needs.

The Future: Making Storage Smarter From the above introduction, the on-board DVR seems to have become more complete. However, only by continuous innovation can the vehicle DVR market develop faster. From the interview, the author learned that the current manufacturers have begun to consider the intelligent processing of certain functions of the car DVR, such as adding face recognition, number statistics, feature recognition and other functions to increase the practicality and pertinence of the on-board system. Make storage more intelligent.

After an illegal incident occurred on the car, the police could only be able to capture it based on their judgment by carefully observing the appearance and wearing of the perpetrator. This is a waste of time and flexibility. Moreover, management center personnel will inevitably miss certain events each time they watch video playback or real-time video streaming. Therefore, for the car DVR implanted "nervous system", let it replace the human brain for analysis, judgment, will be the future direction of development.

For the advantages of adding intelligent analysis technology, intelligent analysis technology uses computer's powerful data processing functions to perform high-speed analysis on massive data in video frames, filter out information that users do not care about, and only provide useful key information for the monitor. Effectively saves bandwidth and greatly increases the available network bandwidth.

More importantly, intelligent video technology can detect suspicious activity, events or behavior patterns by analyzing real-time or recorded video streams. It can enable video surveillance to perform post-search for criminal suspects and convert them into a crime. The auxiliary means of happening.

Intelligent will play an increasingly important role in the future storage applications of vehicle DVRs. Manufacturers will continue to develop more innovative technologies based on the needs of users to ensure the integrity and availability of recorded data.