What is a car DVR and how does it work?
With the development of the transportation industry and the communication industry, the vehicle-mounted video surveillance system has gradually become the standard configuration of public transportation such as taxis and buses. In-vehicle monitoring not only ensures the safety of passengers in the car, but also provides strong evidence for some cases. Vehicle monitoring system also promotes the development of intelligent transportation, therefore, vehicle DVR emerges
as the times require.
1. What is a car DVR:
Car DVR belongs to the market segment of traditional embedded hard disk video recorder, 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 types of vehicles, including: simultaneous audio and video recording, global positioning, and 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 on-board equipment such as on-board displays, 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 and freight, police enforcement vehicles, trains, subways, ships, aircraft and other mobile vehicles.
2. The working principle of vehicle DVR:
At present, the car DVR mainly adopts three storage methods: hard disk, U disk and SD card. Compared with U disk (vehicle video recorder), the reliability is higher.
(1) The U disk has no mechanical moving parts and low power consumption, and can be used for various buses with severe bumps and poor power supply environment. But in these cars, ordinary car DVRs simply don’t work;
(2) It is convenient to transcribe data. You can directly insert the U disk into the USB interface of the computer for video playback and saving, without the need for hard disk connectors, USB adapters, etc. , the operation is simpler;
(3) The U disk interface is designed for repeated plugging and unplugging, which is more reliable than SD card. The SD card interface is the interface in the device and 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.