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How to choose the right tachograph

  • Author:Mary
  • Source:www.tigloncn.com
  • Release on :2014-06-07
Tachograph from around 2009 into the domestic market, to date, there should be more than the owner's friends heard of most of what is tachograph. Tachograph car called the "black box", which by the time of the cars with cameras and synchronized recording mode, the recording process of moving vehicles. When a traffic accident occurs, the recorder recorded surveillance video, you can restore the true course of the accident. For the transport sector, the insurance company to determine the party responsible for the accident, when the evidence played a good role.
In fact tachograph in many countries such as: Russia, South Korea, or other regions, have become mandatory installation automotive equipment. In contrast, the domestic automobile market: domestic car ownership continues to grow; Chinese style crossing, Chinese-style driving habits die hard; Peng Yu case other social phenomena frequent; history of the most serious situations such as the introduction of cross-compliance. Let the owners want to drive on the way, there is a tachograph can escort for themselves, to protect one of their own interests.
Tachograph belong automotive electronic products, owners and friends unfamiliar products, cottage rampant, model a wide range of mixed market situation, the hearts that what criteria to measure a tachograph is optional, it is a problems. Today, Xiao Bian iron lattice Dragon Company (www.tigloncn.com) several tachograph as an example for everyone to popularize basic knowledge of driving under the record, to help owners in the purchase tachograph time, have the right reference standard.
First, tachograph solutions
Tachograph program, also called the tachograph's main chip is to decide the merits of the tachograph congenital fundamental factors responsible for the compressed image data acquisition and data. In the current logger main chip supplier which, according to the video effects, resolution, and cost distinguish roughly sorted in descending positioning: Ambarella (Ambarella), Zoran (Zoran), Novatek (Novatek), too Yan (STK), SQ (SQ) and Sunplus (Sunplus), in addition full blog is designed to do the domestic front and rear dual camera vendor solutions.
Major solution provider in order Ambarella most high-end, can support 1920 * 1080P to 60 frames per second, the market finished the basic price of around 1,000 yuan, the flagship high-end market. Secondly Zoran program is also good, but his company on the tachograph market is not to force products on the market are rare. Novatek is currently the most cost-effective solution solution provider in market share is quite large, the market finished the basic price between 300 to 700 yuan. Again too Yan, SQ, Yang Ling, Ling Tong, are the main providers of low-end market solutions, lower costs, product performance, stability is relatively weak.
Definition two, driving records
As owners of a friend, if the tachograph recording video clarity requirements more demanding, you can choose products based Ambarella program, video resolution up to 1920 * 1080P. As the majority owner, the video screen size and clarity required is not so high, you can choose based on the tachograph Novatek programs, video resolution up to 1280 * 720P. Or choose a more low-end S & P 640 * 480P clear solution products.
Many owners of friends in the actual purchase tachograph time, will find that almost all of the tachograph are 1080P HD video, and relatively inexpensive. This is because many software products through the recorded video resolution interpolation up to. Such as the video recording of a pixel, is amplified by software 2 or more pixels. 720P can become 1080P, what is more, the 480P zoom in to 1080P, but it recorded video itself is not true 1080P.
Through software interpolation technique, the video resolution moderately enlarged, more common in the current market, as long as the larger multiples are not very exaggerated, the effect is still acceptable, such as the 720P interpolated to 1080P. In short, to buy real high-resolution tachograph, a penny for a half truth, or universally applicable.
Third, tachograph fluency
First, we can understand, a single frame of video is a form of continuous play, it is called a picture frame. A few seconds of the play screen, called frame rate; single screen size, then called the video resolution. Can we say the recorder captured 1080P/30 frame, that the recorder can in 1 second, can shoot to 30 with a resolution of 1920 * 1080P-sized screen.
So how much is the most smooth frame rate to the film industry's standards, the video screen is 24 per second to reach fluency best suited to the human eye viewing, the frame rate is too high, the human eye does not come out, frame rate too low the human eye will feel Caton, of course, concerned with the speed of the car. Automobile calculated at 120 kilometers per hour, if the camera recorder can reach speeds of 30 frames per second, then advancing 1.1 meters per car, then grab a logger monitor screen.
In tachograph industry, the monitor screen in general are the best frame rate of 30 frames. Of course, the higher the frame rate, the greater the resolution, on the tachograph higher performance requirements. Current can reach 1920 * 1080P/30 frame camera performance, basically only product Ambarella program. Novatek and other program products, basic imaging performance can only reach 1280 * 720P/30 frame. Many products to achieve 1080P screen, the screen will be at the expense of the frame rate for the price. For example 720P can reach 30, and then interpolated to 1080P, limited to hardware performance tachograph, the frame rate will be reduced from 30 to 20 or 15.
In this light, we can understand why a lot to 1080P HD resolution recorder prices grass herbicides missing. Again, you pay.
Fourth, tachograph lens
The most critical part of the lens is the lens, the lens can be divided into two types: one glass lens, high cost, stable performance, easily deformed color, good transparency, anti-temperature resistance; kind of resin lenses, costs than low in the short term can not see the difference between light transmittance, high temperature deformation exposure discoloration, anti-temperature weak.
Generally, the manufacturers to control costs, will be all-glass lenses, resin or glass lenses and lens mix and match approach. Of course, the owners of a friend in the purchase tachograph when not directly tell the lens material, the best choice in this regard is some brand, reputation, quality assurance of products.
Fifth, a wide-angle tachograph
About tachograph wide-angle, according to many business owners friends can understand the way of publicity, wide bigger taken to monitor the wider picture. Wide-angle perspective of the current market tachograph general publicity are: ranging from 90 degrees to 170 degrees, in fact, the larger the angle is not wide-angle tachograph, the wider the range, the better to see. With a wide-angle shot logger bigger deformation monitoring screen shot of the more obvious.
As a simple example, many owners will see a friend in a parking lot or side convex mirror sharp turn where to watch the turning lane in front of the condition. Can be understood as a kind of convex wide angle is very large, nearly 180 degrees or more, but the picture is seen severe deformation.
To meet the demand for large monitors some owners perspective, while ensuring that the shooting screen recorder does not produce significant deformation, usually by two camera monitor screen, is a complete panorama stitching monitor screen ways.
Six tachograph night vision
Limited to the use of tachograph environmental, technical, cost and other factors, night vision tachograph generally poor, which is the status of an industry. Night light dark tachograph mainly streetlights, car headlights and other external sources, in order to obtain more light, the recorder will generally equipped with LED fill light or infrared LED light source to supplement the machine camera.
From the communication process with many owners learned about the difference between the infrared LED lights and LED lights, here small then simply stressed under. After the infrared LED lights turn on, the human eye is unable to see the machine above the lights are light changes, but through a screen on the machine can be seen on the monitor screen illuminated objects inside, there will be purple iris. After the LED lights turn on, the lamp on the machine emits white light, the human eye can see.
Although by LED lights and LED lights on the monitor screen of infrared fill light, but limited car circuit, the front windshield reflective window film absorbs infrared light and other factors, night vision driving recorder can not achieve the desired state, these auxiliary measures can only be an improvement of the status quo. Night vision driving recorder, the most important thing is to rely on the car light surrounding environment, as well as the effect of a photosensitive sheet inside the machine.
Seven tachograph screen
There is a misunderstanding, the vast majority of the owners friends think, watching shot through traffic recorder comes with the screen is clear, you can determine whether the camera tachograph clear. First we need to understand that the so-called video is clear, depending on the video resolution. Tachograph shooting monitor screen has a resolution; tachograph display also has a resolution; put on the computer monitor screen / TV / phone / tablet computer to watch, these devices have their own display resolution .
If the display device (recorder comes with display / computer / TV / phone / tablet) resolution, tachograph below the resolution of the monitor screen shot, the display device is not sufficient to show the monitor screen definition, then the definition depends on the display device; If the display resolution of the device is higher than the resolution of the monitor screen shot, then this can really see the clarity of the monitor screen.
Tachograph screens, limited to the tachograph when monitoring, adjusting the angle of a good monitor, and tune in live on the recorder to watch the surveillance video used, and can not monitor the effect of the decision of the tachograph. Currently available tachograph, 1.5 inch, 2.0 inch, 2.4 inch, 2.7 inch size majority. Or some tachograph, borrowed from the car other display devices (such as navigation) to display the monitor screen. Of course, the larger screen tachograph, visual experience when viewed relatively good, but the more hindered sight while driving, owners and friends can be selected according to their preferences.
Eight tachograph battery
In general, the tachograph are now equipped with different capacity battery, or can be removed, or the use of built-in, or lithium batteries, or lithium polymer batteries. Although the trip form logger battery capacity size (typically a few hundred milliamps capacity) varies, but we should do to look tachograph battery.
Tachograph on car use, primarily for take power through the car circuits (point cigarette), doing so can achieve ignition (cigarette lighter power supply) automatically start recording; flame (cigarette lighter power) automatic delay off function , more convenient for the owner. In this light, the recorder comes with a battery source of electricity is not working, when the battery power comes tightly limited supply delay shutdown after flameout, travel accident scene using the playback of surveillance video recorders. So now the market is equipped logger battery capacity is not great, generally continue to support the work of the machine 1 to 2 hours or so.
Also on the battery type, the result of a lot of businesses use the difference between lithium polymer battery management, do a lot of publicity over when owners or intimidation. In fact, after so many years of development of lithium batteries, lithium batteries have been rarely adopted by the sun for a long time after-sun products, there will be an explosion of the situation. Although the polymer battery has better electrical properties, of course, the cost is higher. But do not rule out the use of some very poor quality logger businesses lithium battery, the situation will explode at high temperatures will likely appear. So the owners still use some of the best friends a brand, a good reputation, quality assurance of tachograph products.
Of course, there are many owners will tachograph friend of power lines, adapted to the car interior circuitry (such as ACC, car battery), in order to reduce the car's cigarette lighter electronic products occupy, or also from the car after parking the car battery take power to do the monitoring.
Nine, tachograph memory card
Tachograph in the car driving through the course, continuing to work surveillance video captured video data throughput is relatively large (hundreds of megabytes per minute on), so speed and stability requirements for the memory card reader is relatively high. Currently tachograph card is equipped with an SD card (commonly known as kcal) and TF card (small card)-based, capacity to 4G/8G/16G mostly basic requirements card speed 4C or more.
In addition, because the memory card market, the market is chaotic, vacuity, renovation, fake cards, parallel rampant price fluctuations and large, the owner is very easy to buy a friend a non-genuine memory card, the general recommendations with tachograph Resellers . If the recorder manufacturer has equipped the card is good (but with a few manufacturers, memory card capacity is also small, with 4G-based). Currently tachograph maximum support capacity of 32G, in order to ensure clear and smooth video camera effect, it is recommended fitted genuine original card owners, often non-original or non-C4 card above the card will result in a memory card is not recognized, the video leakage seconds, read the preview errors, photographs and video footage incomplete picture Huaping is like.
X. tachograph appearance looks and power
As the tachograph by sucker adsorption on the front windshield, mirrors are generally close to the central location of the hair to the camera can take into account the vehicle in front and around the road is appropriate. Therefore, in the selection of the tachograph appearance, try to either block the line of sight by car, hanging on the front windshield without significant unexpected appropriate.
Also, pay special attention to some of the tachograph camera angle can be adjusted up and down, adjust the angle of rotation around the sucker available. The tachograph is some strong glue by 3M on the windshield, can not turn around the direction at any time, adjust the monitor angle is inconvenient.
Secondly, the general tachograph is equipped with a car charger, car cigarette lighter port with connections to take power. And many times, we need to get from point more cigarette electric equipment, while the center console is equipped with only a single car cigarette lighter port, so many owners prefer the tachograph will be modified, and automotive internal circuit connections together to take power.
In a slightly modified when to note that the vast majority of tachograph operating voltage of 5V, and it is equipped with a car charger supports 12 ~ 24V input, many shop owners or modifications are easy to master directly to the car charger head cut off, directly connected to the positive and negative car circuit, and automotive internal circuits are basically 12 ~ 24V voltage, which will directly lead to the tachograph was burned. So when the circuit modification tachograph, need to use the car voltage conversion.
XI tachograph recording length, segmented preservation, circulation Photography
Break preservation, cycling photography, this is probably the biggest difference between the tachograph different from DV, mobile phones and other imaging devices. When the tachograph recording, video surveillance will be saved in segments, owners can manually set the length of time surveillance video (usually 1/2/3/5/10/15 minute range, or close). Logger stores all video segments, keep it in chronological order in the memory card.
The reason for using segmented way to save, in addition to the characteristics of the machine itself recorder, but more important is to facilitate the owners after the accident (usually within a few minutes or a few seconds), quickly search and retrieval occurs fragments of the accident.
Tachograph itself does not bring the memory for a single tachograph, can save the video length, depending on the size of the memory card with the owners, loggers currently recording resolution and frame rate, surveillance video recorders save compression format (better logger will adopt H.264 compression technology). The higher the resolution, the higher the frame rate, the shorter the length of time to keep the same memory card, whereas longer.
Many owners will ask, when the memory card is full, the need to manually delete the recorded video recorder to record a new video. Certainly not the case, the tachograph card in the memory is full, the latest auto-recorded video segments, in chronological order to replace the oldest recorded video segments, so as to ensure the latest video segments can be preserved well.
There is also a common problem related to - drain seconds. Many loggers performance is not good, will miss a few seconds between two video segments can not be saved. The reason is because the machine at the same time to save on a video, you can not record a video at the same time began only after the completion of a video saved, will begin to record a video, this process will not be missing a few seconds recordkeeping.
Although only a few seconds, but accidents tend to occur in between a few seconds. If the recorder just missed it a few seconds of the accident, purchased tachograph also lost its original meaning, recommended that owners and friends better choose some quality guaranteed, stable performance tachograph.
XII tachograph motion detection function
Motion detection or motion detection function is called, is that when stationary monitor screen recorder, recorder stopped recording in standby status; When a moving object (pedestrian or vehicle) occurs when the lens inside the recorder, the recorder will be activated automatically video recording; When moving objects leave the recorder camera line of sight, the recorder into standby again. This feature is tachograph at the parking time, save power, save main memory means in order to achieve a longer monitoring time parking purposes.
In fact, since the contact tachograph, feeling usefulness of this feature is not very strong. Driving the process, the screen is a dynamic process, tachograph monitoring must be recorded. Only a short stop, or long-stay parking, the motion detection can play its importance. But for short-term parking, continuous recording and short stand on loggers and owners of little significance. The tachograph is also generally do not enter into the stage of long-stay parking monitored. It is generally recommended that owners can turn off the motion detection function, but not often because the motion detection function, so the recorder suddenly records, suddenly does not record, and let everyone mistakenly thought the machine what the problem.
XIII tachograph gravity sensing
Gravity sensor also called collision sensors, is that when the recorder is connected with the body as a whole, the normal camera recorded vibrations generated when a collision occurs when the body, the recorder will shoot the video segment latch, will not repeat the record is automatically overwritten to automatically keep security video evidence. In addition there are also many tachograph manual latch function, when the front car owners hunch what the situation may occur when locked in advance to save the video segment, also not in the loop recorder photography are overwritten.
Of course, there are many low-end models available in the market do not have this feature, the reason is very simple to achieve gravity sensing, internal built-in G-sensor machines need chips and related parts, will increase the cost. This feature of the owners care about my friends, at the time of purchase tachograph, the need to be cautious with the merchant to confirm that the tachograph is with gravity sensing.
Through the above thirteen pairs tachograph analysis to explain in detail, I believe that the owners friends who will buy tachograph time, has had a more comprehensive standard weighed. Although tachograph inexpensive, but it comes to traffic safety issues related to the owners of their own interests, or to learn more about some of the appropriate. (www.tigloncn.com)