What Is a VCR?

A video recorder is a tape recorder for recording TV images and accompanying sounds. It can store TV program video signals and then send them back to the TV transmitter or directly to the TV.

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A video recorder is a tape recorder for recording TV images and accompanying sounds. It can store TV program video signals and then send them back to the TV transmitter or directly to the TV.

VCR is

The video recorder is a recording and playback device in a closed-circuit television monitoring system. It requires a very long recording time. Most dedicated video recorders for the monitoring system can record video from 24H to 960H. In addition, the video recorder must also have a remote control function, so that it can easily operate the video recorder remotely, or use a control signal to automatically operate the video recorder in a closed-circuit television system.

The dedicated video recorder in the CCTV surveillance system is an intermittent video recorder. It has multiple time-lapse recording modes. On a 1 / 2-inch VHS / E180 cassette, it can record up to 960H video. There is a character signal generator in the video recorder, which can print the month / day / year / week / hour / minute / second / recording mode on the image signal. It can also show the number of the camera and alarm and the alarm mode on the image. Using the automatic recording cycle setting function, you can program the recording mode for each day of the week. When the alarm signal is received, the recorder automatically enters the continuous recording state. In the absence of an alarm, the normal intermittent recording mode is restored. In addition, the recorder also has a lock protection key to invalidate abnormal instructions and operations and prevent non-professionals and destructive operations from infringing on closed-circuit television.

Hard disk video recorders are mainly divided into two categories, one is a PC-based hard disk video recorder based on computer architecture (also known as an industrial control hard disk video recorder), and the other is based on

Disadvantages Poor stability DVR software is incompatible with PC hardware, Windows operating system, and imperfections in the Windows operating system itself, which can easily cause system crashes. PC DVR product operation and maintenance requires a certain technical foundation, and the operating system sometimes "washes out" some system configuration and software, which makes maintenance difficult.

The data storage and operating system of the PC DVR are in the hard disk. No matter how encrypted, you can enter the system from the bottom of the PC to delete the recorded image files. If the hard disk of the PC fails at zero, the entire hard disk or even the entire system will be paralyzed, so the reliability of the data will decrease.

The anti-intrusion capability of the Windows operating system is very poor. Once the operating system is damaged (such as virus intrusion), the entire PC DVR will be seriously affected, and even the system crashes.

PC DVR boards are mass-produced products with guaranteed quality, but it is difficult to achieve standardized mass production when assembled into DVR products, so the quality of the entire machine is also difficult to ensure.

The development of various accessories for PCs is very fast, and the original products will be eliminated in 1 to 2 years. For DVR products that can only reflect the cost-effectiveness advantage over a long period of time, the maintenance cost of PC DVR is relatively high, and the PC boards Manufacturers who do not produce DVR products have designed and produced them themselves, and the reliability of long-term maintenance of their products is low.

advantage

Large storage space (easy to expand storage hard disk), suitable for long-term recording.

Good man-machine interface and file management, etc., anyone who has used a computer through the mouse and keyboard can operate well;

Software and hardware upgrades are relatively easy, and product updates are fast.

The maintenance cost is relatively low. General faults can be repaired by replacing parts, and the whole machine will not be scrapped.

There are also some misunderstandings about the embedded DVR in the industry. Because the embedded DVR solutions of many companies are based on the TriMedia 1300 and pSOS operating systems provided by Philips, the industry mistakenly believes that the embedded processor is the TriMedia 1300. Embedded operation The system is pSOS, so some articles have positioned the standard for detecting embedded DVR as whether TriMedia and pSOS are used. In fact, there are many embedded processors, such as:

Digital hard disk

From the 1980s, when foreign analog surveillance products grabbed the Chinese mainland market, in the past 20 years, foreign brands and products have almost dominated the world. Although some national enterprises have participated in the competition in this industry, they have never had the opportunity to form the mainstream of national brands. With numbers

Because the video recorder is a precision electronic device that collects the essence of electricity, magnetism, and machinery, correct and reasonable use can keep it in good working condition, prolong its service life, and reduce the occurrence of failures. The following points should be noted when using the recorder:

1. Familiar with the instruction manual. Newly purchased video recorders or first-time video recorders are not in emergency use because of the wide variety of video recorders, and there are always some differences in the operation and use of various machines. Therefore, you should first read the instruction manual carefully, clarify the functions and connection methods of the switches, keys, input and output jacks, and strictly follow the methods specified in the instruction manual to ensure the normal use of the machine. Otherwise, not only may the machine not work properly, but also the danger of damage.

2. Check the power supply voltage and check whether the power supply voltage of the recorder is aligned with 220V. When adjusting the voltage selector, you must turn off the power of the recorder and unplug the power cord from the power outlet. Some video recorders use a switch-regulated power supply, and the voltage can be applied between 110-240V without adjustment.

3. A good use environment. The environmental conditions directly affect the service life of the recorder. The recorder should be stored and operated in a dry, ventilated, dust-free environment away from vibration sources and strong magnetic fields. The video recorder should be placed in a stable place to avoid strong vibration and collision; it should also be placed in a place that is good for ventilation and avoid high temperature, and not placed in humid and dusty places; it should be as close to the monitor as possible to shorten the transmission cable. Length, reducing signal loss and external interference. Do not place the video recorder near strong magnetic fields, because working under strong magnetic fields will affect the use effect, and do not place it near thinner and volatile drugs such as petroleum spirits and alcohol.

Question 1: When the host is started, there is a case of a speaker alarm. How to judge and deal with it?

When the host starts normally, a short beep sounds. If the long beep sounds continuously, then the memory should not be detected. Most of the memory is not installed or the memory is damaged. Replace the memory; if it is a Long sound and two short sounds, it should be that the graphics card is not plugged in or the graphics card is broken, and the graphics card needs to be replaced; when the system is running normally, a high-frequency alarm sounds, then it should be that the CPU is overheating, the CPU fan is not cooling well, you need to replace the CPU fan The working environment temperature of the host is too high, and the ventilation conditions are not good. It may also be that the CPU alarm temperature in the motherboard BIOS is set too low and needs to be adjusted in time.

Question 2: When the host starts to enter the operating system, the monitor becomes 16 colors and the resolution becomes 640 * 480 (the original graphics card and video capture card have been installed with the driver)

This is because a video capture card is damaged. There is a conflict between the video capture card and the graphics card. You need to replace the corresponding video capture card and re-drive the graphics card driver.

Question 3: The keyboard and mouse cannot be used, how to judge and deal with it?

If the keyboard and mouse cannot be used at the same time, it is likely that the keyboard lock (KB-LK) is turned on. Check whether the keyboard lock (KB-LK) light is on. If it is on, it means that the keyboard is locked. Turn it off. ; If only one of the keyboard and mouse cannot be used, you need to check whether the contact is good. If it is not available, the keyboard and mouse may be damaged or the motherboard interface is defective. Replace the keyboard and mouse with a good keyboard and mouse to detect the problem.

Question 4: When entering the system, the system suddenly becomes very slow, and it will be very slow when running the software or when turning on my computer. How to judge and deal with it?

If you can enter the system normally, but it is very slow, first restore the system (select microsoft windows and enter when the system starts, then enter d :, then enter, then enter cd setup, enter, and then enter hf to enter the system It can be restored.) If the recovery is still slow, it should be a hardware problem. It is most likely that the hard disk is broken. You need to find the damaged hard disk and replace it in time. It may also be an increase in hard disk and power supply Insufficient power, you can replace the power of the corresponding power according to the situation.

Question 5: The host cannot be turned on, how to solve it?

First, eliminate the display damage and determine whether the power supply is normal, that is, whether the power light is on. If you normally observe the host to see if there is a beep, a long "beep" sound or a long beep or two short beeps will indicate the memory. Or the graphics card is not working properly, please refer to the problem 1; if there is no beep, then there should be a problem in the power supply, the motherboard or the CPU (the probability of the problem is small), and the replacement exclusion method (that is, replacing the suspect with a confirmed part) Check the faulty parts one by one) Find the faulty part and replace it. The operating frequency of the CPU is not the default operating frequency of the current CPU. You need to enter the BIOS to adjust the current operating frequency of the CPU.

Question 6: Only the Xunhui logo appears on the screen when the software starts, there are six letters below the xunhui without image signal

This is the wrong type of video capture card was selected when the software was started. As long as the card driver is adjusted, it can be displayed normally (double-click to open the XHDVR-2004.INI file in the WINNT directory of the C drive, and set AutoSelect = 1 in the 1 to 0 to re-select the card when the software is started); or the video capture card driver is not installed correctly, you need to install the corresponding driver and restart the host.

Question 7: When a channel with an image appears completely black during software startup or use, it is also completely black when there is no video signal (no five words without video signal). Without adjusting the channel monitoring parameters, the color image signal is black and white when monitoring.

This is because the video capture card is damaged, replacing the corresponding video capture card can solve the problem.

Question 8: If you get into the screen when entering the software,

It may be that the software does not exit normally, and the host can be restarted; if the phenomenon persists after restarting, it should be a problem with the graphics card and the graphics card should be replaced in time.

Question 9: There are a few minor issues to be aware of when setting up a schedule.

When setting up multi-time recording in different recording modes, it should be noted that the software records in a 24-hour manner, so the start time must be less than the end time when setting the schedule. If you cross the 24 o'clock setting, you need to set it in two periods (such as 18.00.00 to 23.59.59, and then 0.00.00 to 7.59.59). Mobile alarm recording and alarm alarm recording need to be armed (including manual arming and arming according to schedule), continuous recording is not required.

Question 10: When the recording mode is set. However, after a period of time, the video cannot be recorded normally. How to eliminate and deal with it?

If all channels cannot record (in the channel recording control, all channels are not in the yellow light state) or it is displayed as a recording state, but the recording file cannot be generated on the hard disk, then the hard disk grouping should be wrong, and the hard disk needs to be re- Group and restart the software again. If the problem is still not resolved, all channels are still blue, and the video file cannot be deleted when entering the operating system, then the permissions of the hard disk should be changed, and the permissions of the hard disk need to be adjusted back.

If it is an alarm recording, suddenly one or more channels cannot be alarmed. First, check whether the recording mode is set correctly. If the setting is correct, check whether the detection area of the channel has been changed by someone. If it is changed, you need to modify the channel again. Detection area, and then restart the software.

Question 11: When the PTZ device is used and cannot be controlled normally, how to judge and deal with it.

First see if the PTZ protocol, address code, and baud rate are the same as the instructions. If all are set, but the PTZ cannot stop rotating when it is controlled (normally, click it, it will turn a bit.) Then It should be that there is something wrong with the device, and the PTZ device needs to be replaced in time. When multiple gimbals are used, they cannot be controlled normally, then see if the module (232 to 485) can drive it.

Question 12: When using the network, I can't monitor it, what should I do?

First of all, you need to understand that there are several conditions that need to be met when using network monitoring. Is the network setting set up and is the network smooth? For example, are the 21 ports required by the Internet access software on the router mapped to the master? Is there a fixed IP or domain name? If it is LAN monitoring, then as long as it is set up, ensure that the network is unblocked (if the network is unblocked, check the line) and the master can be monitored. If it is WAN monitoring, in addition to the network side needs to be set up, are you looking at whether the host can access the Internet? If it doesn't work. See if the gateway and DNS settings are correct (where the gateway and DNS should be the IP of the router)? Then see if the router can map the port to the monitoring host? Among them, a fixed IP or domain name is essential. As long as several conditions are met, monitoring is no problem.

Question 13: The machine automatically restarts repeatedly

This phenomenon is because the user has performed some abnormal operations, and the cumulative effect caused the Windows system to crash. The monitoring host has a crash protection function, that is, the Windows system is restarted. In addition, the ventilation environment of the machine is not good enough to cause damage to the chassis or CPU fan, resulting in heat dissipation. Not enough, causing the monitoring host to freeze. Suggestions: Uninstall the software and then reinstall the monitoring software; improve the ventilation conditions and replace the damaged fan.

Question 14: The software does not work

When logging in, the corresponding user name and password were not entered; or the logout button was pressed. Please click the re-login button, enter the corresponding username and password, and log in.

Question 15: The channel screen is a big picture after startup

This system cannot detect the presence of audio and video compression cards. It may be that the audio and video compression card is not installed on your machine or the driver is not installed properly. In addition, some industrial computer motherboards are not compatible with the compression card. It is also possible This phenomenon occurs. Solution suggestion: please exclude these possibilities.

Question 16: The number of channels is normal, but each channel screen displays magenta

Please adjust the color of the desktop display properties to 32-bit color.

Issue 17: Software starts reporting errors immediately

The probability of this error occurring is extremely low and will not occur on a properly managed host. In general, the reasons for this failure are as follows: 1) The user host is frequently powered off suddenly; 2) The software is run on a machine with extremely unstable hardware configuration multiple times. Suggestion: Check the host configuration and restart the software.

Question 18: Recording produces large files

This system faithfully records the video and audio signals generated by the board and uses an excellent compression algorithm to ensure that no key image is lost in any frame, ensuring the real-time performance of the video file playback. The user can calculate the frame number of the video file in question through the dedicated player of this system. Generally, the default file size of the system is basically normal within 120M / hour. If the listed conditions are not within these, it can be regarded as abnormal, and you can proceed from the following aspects: 1. Observe the preview image of the corresponding channel, the picture should be soft, clear and without flare, and not glare. If there are abnormal dazzling highlights or evenly distributed snowflake flares on the image; this indicates that the original video signal is too noisy, please consider adjusting or replacing the camera; 2. The video quality is set too high and the motion is too violent. The video quality can be reduced appropriately.

Question 19: Mosaic during video file playback

Whether the host is seriously deficient in resources for other reasons. For example, the host is performing a multi-channel playback operation that exceeds the system's capability at this time. Once the host resources are exhausted and the recorded data cannot be decoded normally, a mosaic may occur.

Question 20: The preview on the web is animated

The network communication bandwidth is insufficient. At this time, the recording quality of the host can be lowered properly.

Video cassette recorder

Video tape recorders are divided according to recordable time and can be divided into 24h, 48h, 72h, 96h, 120h, 240h, 480h, 720h, 960h and other types.

Digital hard disk recorder

Digital hard disk video recorder signal compression methods include MPEG-1, MPEG-2, MPEG-4, JPEG, and M-JPEG.

(1) The recording speed of the MPEG-1 and MPEG-2 signal compression methods is 25 frames / second or more (real-time recording).

(2) The recording speed of JPEG and M-JPEG signal compression methods is about 10 frames / second (non-real-time recording).

Selection points of video recorder

(1) Provides intermittent recording and playback in real time at standard speed and multiple options.

(2) It has the function of starting and stopping the recording according to the specified time, and includes the date and time and camera position code generator to record the date, time and position code, and it can be displayed on the monitor.

(3) According to the real-time or non-real-time recording requirements, select the digital hard disk video recorder signal compression method and hard disk capacity.

(4) Digital hard disk video recorders can select technical indicators such as screen division processing, camera control, and alarm linkage according to the needs of system functions.