Four common ways home wireless surveillance cameras work
In the wireless monitoring system, there are four types of wireless monitoring equipment: 3G wireless monitoring equipment, 4G wireless video transmission equipment, microwave wireless monitoring equipment and WIFI wireless monitoring equipment.At present, these kinds of devices are not unfamiliar to everyone. Wireless signals can be seen everywhere in our life. What is the application of home wireless surveillance cameras in the surveillance system?Here's a brief introduction:
1. 4G wireless video transmission equipment
4G is short for fourth-generation mobile communication technology.China mobile 4G USES td-lte, the 4G LTE standard.The peak transmission rate of the td-lte demonstration network can reach 100Mbps downstream and 50Mbps upstream.Td-lte is a 4G network standard dominated by China. The technology is mature and ready for large-scale promotion.
4G wireless video transmission device is a communication technology formed after 3G wireless monitoring device, which integrates 3G and WLAN and can quickly transmit data, high quality, audio, video and image.The advantages of 4G wireless video transmission equipment are: 4G wireless video transmission rate is higher, can transmit high-quality video images, it can provide more stable and adjusted wireless mobile network.The initial investment is very low, installation and use is very convenient, as long as there is 4G signal coverage, open the device to transmit signals.The disadvantage of 4G wireless monitoring equipment is that the late communication cost is relatively large, which is not suitable for long-term 24-hour monitoring.
2. 3G wireless monitoring equipment
3G wireless monitoring is a simple and easy to use small remote wireless monitoring system, is the use of the latest 3G communication technology, for the needs of families, small enterprises or specific industry users monitoring applications, designed to achieve a simple installation, easy to operate, cost-effective 3G mobile video monitoring equipment.
The advantages of 3G wireless monitoring equipment are: the initial investment is very low, installation and use is also very convenient, as long as there is 3G signal coverage, open the device can transmit signals.
The disadvantage of 3G wireless monitoring equipment is that the late cost is relatively large, not suitable for long-term 24-hour monitoring.At present, this kind of transmission signal is still not smooth for image transmission, and the image quality is not high enough to meet the requirements of hd transmission.
3. Microwave wireless monitoring equipment
Microwave wireless monitoring equipment is a mainstream product in the market, which is a perfect combination of microwave transmission technology and wireless monitoring technology.Microwave wireless monitoring can be divided into analog microwave and digital microwave two ways.
Analog microwave transmission is to modulate the video signal directly on the microwave channel (microwave transmitter), and send it out through the antenna. The monitoring center receives the microwave signal through the antenna, and then demodulates the original video signal through the microwave receiver.The image of this monitoring method is very clear, no delay, no compression loss, low cost, simple construction, installation and debugging, suitable for the general monitoring point is not many, the need for relay is not many circumstances to use.
Digital microwave transmission wireless bridge, is the first video compression coding, modulation, and then through the digital microwave channel travel through the antenna to launch out, at the receiving end, on the other hand, the antenna signal, microwave expansion, video decompression, reduction of analog video signal, can enlarge after microwave solution by computer installed the corresponding decoding software, the use of computer software to extract the video, and computer also support the video playback, management, yuntai control, alarm control, and other functions;This kind of monitoring method is more complex, need to add the case of relay more, the monitoring point is more concentrated, it can be centralized transmission of multi-channel video, anti-jamming ability is better than simulation, and so on the advantages, suitable for the monitoring point is more, need to use the case of relay more.
4. WIFI wireless monitoring device
WIFI (WirelessFidelity), officially known as "ieee802.11b", is a short-range wireless technology used in offices and homes, along with bluetooth.Although the technology is less secure than bluetooth in terms of data, it is better in terms of radio coverage.Wi-fi coverage can reach about 300 feet, and offices can be used, needless to say, in smaller buildings.
WIFI is a worldwide free frequency band that does not require any telecom operating license, so WLAN wireless devices provide a low-cost wireless air interface with high data bandwidth that can be used worldwide.
Disadvantages of WIFI wireless monitoring equipment: the transmission distance is short, so the signal can only be transmitted within a short distance, and the diffraction ability is very poor, so the signal can be transmitted without shielding as far as possible.
Advantages of WIFI wireless devices: very low cost of investment, very easy to install and use, no professional can also set up the network.
Wireless monitoring has a wide range of applications, such as elevator monitoring, construction site monitoring.
Wireless monitoring construction cost is greatly reduced, small project can consider the development trend of wireless monitoring after monitoring.
Intelligent system is more, everybody must consider in advance when distributing management computer, avoid late install software, database conflict.In particular, building control, one - card, intercom must set up a management computer.