What is a car DVR, Working Principle Introduction
What is a car DVR
With the development of the transportation industry and the communication industry, the on-board video surveillance system has gradually become the standard configuration of public transportation such as taxis and buses. Vehicle monitoring not only ensures the safety of passengers in the vehicle, but also provides strong evidence for some cases. Vehicle monitoring system also promotes the development of intelligent transportation, therefore, vehicle DVR came into being.
1. What is a car DVR:
Car DVR belongs to the subdivided market of traditional embedded hard disk video recorders, and is a new type of special product developed with the application of digital video and audio coding technology in vehicles. It adopts embedded processor and embedded operating system, and integrates the latest H.264 audio and video compression/decompression technology, GPS global positioning technology, 3G wireless communication technology, USB communication technology, advanced vehicle power management technology and GIS geographic information technology. This product is mainly used for 24-hour monitoring of various vehicles, including: audio and video synchronization recording, global positioning, wireless audio and video real-time transmission. At the same time, a variety of interfaces are reserved on the host, which can be connected to vehicle-mounted equipment such as vehicle-mounted monitors, IC card installations, signal priority control systems, and passenger flow statistics systems. At present, the equipment has been widely used in public transportation, long-distance passenger transportation, school buses, engineering vehicles, container vehicles, tourist buses, logistics freight, police law enforcement vehicles, trains, subways, ships, aircraft and other mobile vehicles.
Working principle of vehicle DVR
Working principle of vehicle DVR:
At present, car DVR mainly adopts three storage methods: hard disk, USB flash drive, and SD card, which are more reliable than USB flash drive (vehicle video recorder).
(1) The U disk has no mechanical moving parts, low power consumption, and can be used in buses with severe bumps and harsh power supply environments. But in these cars, ordinary car DVRs can't work at all;
(2) It is convenient to transcribe data. You can directly insert the U disk into the USB interface of the computer to play back and save the video, no hard disk connector, USB adapter, etc. are required. , the operation is simpler;
(3) U disk interface design is suitable for repeated plugging and unplugging, which is more reliable than SD card. The SD card interface is an interface in the device, and it is not suitable for frequent plugging and unplugging, otherwise the damage rate will be quite high.
The USB interface is an interface between devices and is specially designed for data exchange between devices. Whether it is the electrical, physical or mechanical properties of the interface, it is suitable for long-term data exchange between devices.
Popular application fields
Popular application fields:
(1) Personal consumer electronics market: NVR is easy to install and use, and can help users easily install network surveillance systems without the help of engineers. With the improvement of living standards and the popularization of broadband, this demand will increase;
(2) Large-scale and decentralized monitoring fields, such as road monitoring: Compared with optical fiber, NVR has a very high cost advantage;
(3) Small applications such as enterprises, supermarkets, Internet cafes, etc. With the rapid development of the NVR market, the storage requirements for simultaneously managing a large number of video signals and massive video data have promoted the development of intelligent analysis technology. At present, analysis software is more and more complex and precise, so it will be widely used in NVR, such as identifying and analyzing customers' purchase patterns, identifying criminals, and monitoring specific targets that are unattended in public places.
(4) Real estate property is a relatively popular industry recently. For example, the construction and maintenance of some office buildings has brought a lot of business opportunities to security. Users in these fields pay more attention to the cost performance of products and are more inclined to accept PC DVR.
At present, some mainstream DVR manufacturers are also waiting to see the formation of the home user market. With the increasingly mature network conditions, the application of small video surveillance systems in home users is also worth looking forward to. In terms of product structure, functional requirements, and cost, the home user market has special requirements. Zhu Hongzhan of Hanbang Hi-Tech said that like some home users, they may need products that are easier to operate. The dumber they are the better. The function does not need to be too complicated, the number of paths is small, and the cost can meet the needs. Such as entertainment functions, automatic control functions may also be concerned. Some users may wish that the DVR has the functions of recording TV programs, automatic alarm and monitoring mobile phones. The system can be connected to the Internet, but also pay attention to the protection of privacy and security.
