How about the growing up portable dvr digital video recorder
richmor
richmor.net
2018-03-16 14:06:39
The digital video recorder is also called MDVR (mobile digital video system). It uses the same audio and video acquisition and compression mode as the common DVR, but due to the different functions and applications, the vehicle DVR has its special design requirements. From the application environment, the vehicle-mounted digital video recorder needs to record and transmit the scene in a high-speed movement, severe vibration, unstable power supply, serious interference and dusty complex environment. At the same time, vehicle-mounted digital video recorder also has several functions, such as monitoring, driving status recording, additional entertainment, and advertising, etc., which is different according to different applications, including Beidou /GPS satellite positioning, wireless remote transmission (WIFI, 3G/4G) and other expansion functions.
With the increasing recognition of the Portable dvr digital video recorder, various levels of demand have emerged as well. Vehicular digital video recorder function more perfect, its scope is wide, the greater the effect, not only is widely used in the city of BUS, long-distance bus, freight vehicles, and in the train, ship, ambulances, fire trucks, cars, traffic law enforcement vehicles, truck supplies, train, car, bus and other organs it is very important for the field.
The onboard digital video recorder will play an important role in the development of social civilization, social harmony and the safety of people's travel. Under the requirements of different industrial applications, the vehicle monitoring system also plays a different role. And the difference in the industry, its attention also changes, the system function and product configuration have evolved different features.
As one of the most important functions of video vehicle surveillance equipment, the ability of audio and video codec is one of the key capabilities of vehicle digital video video recorder. In this regard, the vehicle video recorder and the ordinary video recorder are essentially different from each other. They choose the mainstream video codec chip, and adopt the mainstream coding and decoding format to find the maximum harmony between coding efficiency and image definition. At present, most of the decoding methods of ordinary VCR adopt H.264 standard.
In order to meet the real-time online transmission of video images, most of the vehicle-mounted devices use 3G networks. Compared with 2G, a common transmission method used in the car's conventional tachograph, 3G mainly improves the speed of sound and data transmission. It can achieve better wireless roaming and processing of images, music, and video streams globally. It can support different data transmission speeds in other media formats, that is, it can support transmission speeds of at least 2 Mbps, 384 kbps, and 144 kbps in indoor, outdoor, and driving environments, respectively (this value will change according to the network environment). With the rise of 4G networks, vehicle-mounted video recording equipment has begun to use 4G as a transmission method, data transmission speed is faster, and the amount of data that can be supported is transmitted in a larger HD picture.
With the increasing recognition of the Portable dvr digital video recorder, various levels of demand have emerged as well. Vehicular digital video recorder function more perfect, its scope is wide, the greater the effect, not only is widely used in the city of BUS, long-distance bus, freight vehicles, and in the train, ship, ambulances, fire trucks, cars, traffic law enforcement vehicles, truck supplies, train, car, bus and other organs it is very important for the field.
The onboard digital video recorder will play an important role in the development of social civilization, social harmony and the safety of people's travel. Under the requirements of different industrial applications, the vehicle monitoring system also plays a different role. And the difference in the industry, its attention also changes, the system function and product configuration have evolved different features.
As one of the most important functions of video vehicle surveillance equipment, the ability of audio and video codec is one of the key capabilities of vehicle digital video video recorder. In this regard, the vehicle video recorder and the ordinary video recorder are essentially different from each other. They choose the mainstream video codec chip, and adopt the mainstream coding and decoding format to find the maximum harmony between coding efficiency and image definition. At present, most of the decoding methods of ordinary VCR adopt H.264 standard.
In the use and acquisition of video, there is a big difference between the common DVR and the vehicle DVR. Ordinary DVR is often applied in fixed places, and the equipment is placed in a fixed place. It is not easy to move. It can be displayed locally or through the fixed network (ADSL) to access the private network. Any observation point in the network can access the DVR host through the network. The vehicle DVR can only monitor the special network through 3G/4G access. Therefore, the vehicle DVR is more concerned with the control of the bit stream, and the ordinary DVR pays more attention to the priority of the quality of the picture. H.264 has high compression ratio and high quality and smooth image. Because of this, video compression data compressed by H.264 need less bandwidth and more economic in network transmission.
In order to meet the real-time online transmission of video images, most of the vehicle-mounted devices use 3G networks. Compared with 2G, a common transmission method used in the car's conventional tachograph, 3G mainly improves the speed of sound and data transmission. It can achieve better wireless roaming and processing of images, music, and video streams globally. It can support different data transmission speeds in other media formats, that is, it can support transmission speeds of at least 2 Mbps, 384 kbps, and 144 kbps in indoor, outdoor, and driving environments, respectively (this value will change according to the network environment). With the rise of 4G networks, vehicle-mounted video recording equipment has begun to use 4G as a transmission method, data transmission speed is faster, and the amount of data that can be supported is transmitted in a larger HD picture.
Car-mounted digital video recorders can also be combined with automotive electronics related functions. For example, car driving data acquisition and upload generally adopts CAN bus technology. Vehicle-mounted digital video recorders should also have CAN bus access and analysis processing functions, and records the relevant vehicle driving through hard disks. Information, analysis and processing of important data. In addition to increasing the hard disk damping and reinforcement processing, vehicle-mounted digital video recorders also need to pay attention to the difference between the power used by such projects and the power supply of ordinary automobiles. For example, the power of on-board equipment provided for trains is mostly DC 48V or DC 110V. The car power supply is DC 12V or DC 24V. As a front-end core device for information convergence, HD Vehicle DVR system supplier also perform the functions of vehicle information collection and aggregation. Can access a variety of car accessories, providing a wide range of sources of information. The inertial sensor (Figure 1) is an electronic device that measures vehicle acceleration and the vehicle's ambient temperature. Through the measurement of acceleration, it is possible to understand whether the driver has a bad driving habit such as sudden acceleration, sudden braking, etc., when the vehicle is hitting or turning over during driving. The cause of the accident is analyzed; the temperature measurement by the built-in temperature sensor can be performed. Understand the temperature of the vehicle equipment environment and trigger a temperature alarm.