Car DVR Technology
2019-09-07 12:05:27
Car DVRs are said to be new products of the era in the security industry, but the technical content, I am afraid only real people who have done car DVR can understand, this article mainly discusses the next four questions of the car DVR industry that Application requirements analysis.
Car DVR Technology Q. What is the difference between an onboard DVR and an ordinary DVR?
Ordinary hard disk video recorders use 220V alternating current, the voltage and current stability is relatively stable, and then because the ordinary hard disk video recorder location environment is fixed, the relative vibration opportunity is almost not, so the ordinary hard disk recorder anti-seismic function can be ignored. However, car DVRs are different. First of all, the voltage and current in the car can not be understood in accordance with the conventional thinking. The voltage on the car is 12/24V. However, in fact, 12V is not able to achieve 12V regulation, and 24V is the same, so the design of the power supply board It is very important that the design of the power board has many aspects to consider.
How to design the power of car DVR?
In order to ensure the normal operation of the car DVR, we must first ensure that the output power of the power board is stable.
In a fixed narrow voltage environment, because the input voltage and current are basically stable, and in terms of electricity, the output power determines the input power, so only one adapter is required for the power supply of an ordinary hard disk video recorder. An adapter is nothing more than a transformer. A filter circuit, a little conscience plus a protection circuit, no protection of the conscience circuit is not installed, cheap thing, so ordinary hard disk video recorder costs and maintenance costs are relatively low.
However, for car DVRs, the first thing to do is to narrow down the dynamic voltage and current. How to ensure the normal operation of the car DVR, a stable voltage and current is very important, but on the other hand, the input power of the device is fixed, by W = U * I know, the voltage is changing when the current is changing, the voltage is The direction of change of current is always the opposite. So if the starting voltage is lower, the relative starting current will increase. Macro is simple, but can do this function and ensure the normal operation of the equipment, it may need a lot of efforts, the first is to protect the circuit design, to know that the car DVR power board within 1 hour to When subjected to hundreds of shocks, the protection circuit does not perform well, and if the power board is damaged, the power board is directly damaged and the motherboard is burned.
How is the anti-seismic design of a car DVR designed?
The seismic design of on-board DVRs is very important. It is actually how to protect hard drives. Because the current hard disks are mechanical spindle hard disks, the distance between the read/write head and the disk surface is only a few microns. If you look with the naked eye, the read/write head is affixed to the disk surface, but even if you don't understand the hard disk, you should understand that 5400 The rotating hard disk must be rotated at least 90 times per second. If the read/write head is attached to it, the read/write head will be worn out before long. Such a close distance, if the earthquake is not doing well, as long as the read-head has a little bit of trembling, if the hard disk is bad, then the head is crashed (hard disk term). So the hardware earthquake is very important.
How hard is fault-tolerant error correction for hard disk video recorders onboard?
A: The fault-tolerance and error-correcting capability of hard drives is a difficult problem that has always been sought after in the IT hardware industry or the software industry. For an embedded system, it is difficult to achieve a very perfect fault-tolerant and error-correcting design! However, the intention of the embedded system design is that the embedded system is originally designed for the pursuit of better stability and execution speed, but there is a problem that cannot be ignored that is poor portability, resulting in a design that cannot be too Big change. So its first design idea is very important. Embedded systems for hard disk fault tolerance error correction, the current effective way is to read and write control capabilities.
Analysis of Demand for Application of Car DVR Industry
1, * Vehicle Custom Function Analysis * The industry's main functions of the car DVR are: video surveillance, wireless network transmission, PTZ control. * Pay more attention to how to conduct illegal evidence collection. The main requirements are: license plate recognition, blacklist comparison, etc. * And transport and other industries also have similar requirements with *.
2. Analysis of custom functions of the passenger transport industry In addition to the simple vehicle-mounted video surveillance function, the passenger transportation industry needs wireless video surveillance (in order to understand real-time conditions inside and outside the car), GPS satellite positioning, vehicle scheduling, and vehicle voice reporting stations. , vehicle travel information records, multimedia entertainment advertisements and other functions.
3. Financial industry custom function analysis The financial industry's transport of banknotes requires the on-board DVR to work stably and reliably. In the event of an emergency, the video and alarm information can be instantly uploaded to the management center platform and interact with the monitoring center platform.
4. Other Vehicles The use of vehicle-mounted hard disk recorders in rail transit, shipbuilding, aviation, and other industries also requires real-time monitoring. In addition to increasing the hard disk damping and reinforcement, these industries need to pay attention to the power used by such projects and the power of ordinary vehicles. The difference, for example, the power provided by trains for on-board equipment is mostly DC48V or DC110V, while the general vehicle-mounted power supply is DC12V or DC24V.
5, automotive electronic custom function Car DVR should also be combined with automotive electronics related functions, such as: car driving data acquisition and upload commonly used CAN bus technology, car hard disk recorders should also have CAN bus access and analysis and processing functions, through the hard disk Record relevant information on vehicle travel and analyze and process important data.
Car DVR Technology Q. What is the difference between an onboard DVR and an ordinary DVR?
Ordinary hard disk video recorders use 220V alternating current, the voltage and current stability is relatively stable, and then because the ordinary hard disk video recorder location environment is fixed, the relative vibration opportunity is almost not, so the ordinary hard disk recorder anti-seismic function can be ignored. However, car DVRs are different. First of all, the voltage and current in the car can not be understood in accordance with the conventional thinking. The voltage on the car is 12/24V. However, in fact, 12V is not able to achieve 12V regulation, and 24V is the same, so the design of the power supply board It is very important that the design of the power board has many aspects to consider.
How to design the power of car DVR?
In order to ensure the normal operation of the car DVR, we must first ensure that the output power of the power board is stable.
In a fixed narrow voltage environment, because the input voltage and current are basically stable, and in terms of electricity, the output power determines the input power, so only one adapter is required for the power supply of an ordinary hard disk video recorder. An adapter is nothing more than a transformer. A filter circuit, a little conscience plus a protection circuit, no protection of the conscience circuit is not installed, cheap thing, so ordinary hard disk video recorder costs and maintenance costs are relatively low.
However, for car DVRs, the first thing to do is to narrow down the dynamic voltage and current. How to ensure the normal operation of the car DVR, a stable voltage and current is very important, but on the other hand, the input power of the device is fixed, by W = U * I know, the voltage is changing when the current is changing, the voltage is The direction of change of current is always the opposite. So if the starting voltage is lower, the relative starting current will increase. Macro is simple, but can do this function and ensure the normal operation of the equipment, it may need a lot of efforts, the first is to protect the circuit design, to know that the car DVR power board within 1 hour to When subjected to hundreds of shocks, the protection circuit does not perform well, and if the power board is damaged, the power board is directly damaged and the motherboard is burned.
How is the anti-seismic design of a car DVR designed?
The seismic design of on-board DVRs is very important. It is actually how to protect hard drives. Because the current hard disks are mechanical spindle hard disks, the distance between the read/write head and the disk surface is only a few microns. If you look with the naked eye, the read/write head is affixed to the disk surface, but even if you don't understand the hard disk, you should understand that 5400 The rotating hard disk must be rotated at least 90 times per second. If the read/write head is attached to it, the read/write head will be worn out before long. Such a close distance, if the earthquake is not doing well, as long as the read-head has a little bit of trembling, if the hard disk is bad, then the head is crashed (hard disk term). So the hardware earthquake is very important.
How hard is fault-tolerant error correction for hard disk video recorders onboard?
A: The fault-tolerance and error-correcting capability of hard drives is a difficult problem that has always been sought after in the IT hardware industry or the software industry. For an embedded system, it is difficult to achieve a very perfect fault-tolerant and error-correcting design! However, the intention of the embedded system design is that the embedded system is originally designed for the pursuit of better stability and execution speed, but there is a problem that cannot be ignored that is poor portability, resulting in a design that cannot be too Big change. So its first design idea is very important. Embedded systems for hard disk fault tolerance error correction, the current effective way is to read and write control capabilities.
Analysis of Demand for Application of Car DVR Industry
1, * Vehicle Custom Function Analysis * The industry's main functions of the car DVR are: video surveillance, wireless network transmission, PTZ control. * Pay more attention to how to conduct illegal evidence collection. The main requirements are: license plate recognition, blacklist comparison, etc. * And transport and other industries also have similar requirements with *.
2. Analysis of custom functions of the passenger transport industry In addition to the simple vehicle-mounted video surveillance function, the passenger transportation industry needs wireless video surveillance (in order to understand real-time conditions inside and outside the car), GPS satellite positioning, vehicle scheduling, and vehicle voice reporting stations. , vehicle travel information records, multimedia entertainment advertisements and other functions.
3. Financial industry custom function analysis The financial industry's transport of banknotes requires the on-board DVR to work stably and reliably. In the event of an emergency, the video and alarm information can be instantly uploaded to the management center platform and interact with the monitoring center platform.
4. Other Vehicles The use of vehicle-mounted hard disk recorders in rail transit, shipbuilding, aviation, and other industries also requires real-time monitoring. In addition to increasing the hard disk damping and reinforcement, these industries need to pay attention to the power used by such projects and the power of ordinary vehicles. The difference, for example, the power provided by trains for on-board equipment is mostly DC48V or DC110V, while the general vehicle-mounted power supply is DC12V or DC24V.
5, automotive electronic custom function Car DVR should also be combined with automotive electronics related functions, such as: car driving data acquisition and upload commonly used CAN bus technology, car hard disk recorders should also have CAN bus access and analysis and processing functions, through the hard disk Record relevant information on vehicle travel and analyze and process important data.
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