Wireless is an important trend in the development of conference system industry products. With the development of wireless communication technology, mainstream manufacturers are vigorously developing wireless conference products.
The wireless technology category is mainly divided into radio frequency (radio wave) transmission and infrared transmission. The principle of radio frequency transmission is that the electric field and the magnetic field are mutually induced to rapidly spread out, and the information to be transmitted is loaded on the electromagnetic field induced by each other to realize radio frequency wireless transmission. The principle of infrared transmission is essentially different from radio frequency transmission. It mainly relies on the relationship between the brightness and the intensity of infrared light or the change of strength and weakness to achieve the transmission of information (the infrared light emitted by the transmitting end according to the information characteristics, the receiving end through the photodiode Receive infrared light and convert it into a level signal with information).
The main application frequency bands of wireless radio frequency transmission are VHF, UHF, 5G and so on. VHF is mainly used in broadcasting radio/television, aviation navigation and other fields. It is suitable for long-distance communication. The frequency band is less used by the conference industry. The main applications of UHF can be divided into 400MHz ~ 900MHz and 2.4GHz by frequency, 400MHz ~ 900MHz. One frequency band is mostly used in broadcast television, walkie-talkies, etc., while 2.4G is applied to wireless networks; the 5GHz frequency band is also applied to the wireless network. The distribution of the infrared modulation frequency band is limited by the switching frequency of the infrared receiving tube, and the infrared modulation frequency cannot be too high, generally within 10 MHz, and is applied in the conference system, and currently 2 MHz to 8 MHz is conventionally used.
Below we analyze the main features of various wireless technologies:
1. The U segment (400MHz ~ 900MHz) has the advantages of strong signal diffraction capability, easy signal coverage, low transmission attenuation, and low power for long-distance transmission. However, due to the relatively low data transmission rate, it cannot meet the large data volume. Digital system. Small-scale audio transmission for analog FM modulation technology, and product communication with small amount of information data, such as wireless voting system, U-band wireless microphone, etc. Applying this frequency band to the conference system is susceptible to interference and is difficult to overcome, and FM analog modulation is commonly used, which is prone to noise, crosstalk, and blind sound.
Second, the G segment (2.4G/5G) has the advantages of high data transmission rate, large signal load capacity, and low interference source in the 5G frequency band. It is suitable for product communication with large amount of information such as audio and video, such as wireless discussion system, the same Transmission system, paperless conference, multimedia transmission, etc. The G segment is the main object of today's wireless communication technology research, and the technology has large expansion space and strong compatibility. Since this band is widely used in wireless networks, the difficulty in using the conferencing system is how to coexist with the WIFI system without interference.
Third, the advantage of infrared transmission is that there are few sources of interference, and it is not susceptible to malicious interference from the outside. However, the disadvantages are also obvious, the signal diffraction ability is poor, the transmission attenuation is large, and the signal coverage is difficult due to the influence of the environment and the light. In the application of infrared transmission technology in the conference system, in order to overcome the signal attenuation phenomenon during transmission and provide sufficient reflection energy, it is necessary to modulate a strong signal transmission power, so it is suitable for the application field of one-way communication, like the sound interpretation language. Distribution system. The main problem in the application of infrared transmission technology to conference systems is to overcome power design and engineering construction problems.
GONSIN's wireless communication system: Since its establishment in 2003, it has been deeply researching wireless products. In 2003, it successfully launched the world's first wireless digital conference voting system with frequency detection and frequency offset correction. In 2006, the original DSSS wireless digital technology was launched, and the wireless digital simultaneous interpretation system was developed by applying this technology. In the same year, it was awarded the “2006-2007 National Torch Program Projectâ€. In 2006, a 6-channel infrared simultaneous transmission system was developed. With the advent of WIFI wireless technology, the public trust R&D team applied the technology to the conference system in 2011 and launched the GONSIN10000 conference server. In 2015, the public letter once again experienced a qualitative leap. After years of accumulation of wireless technology, it successfully developed a wireless conference system with 2.4G hop-hop (FS-FHSS) technology, and launched a paperless application conference server GONSIN30000 based on WIFI technology.
FS-FHSS selective hopping technology features: 2.4GHz global public frequency band, no license authentication, rich wireless frequency resources, 80 frequency points available; 2.4GHz carrier frequency is high, signal coverage diffraction ability is weak, so the venue is around or The 2.4GHz signal in other parts of the city can't interfere with the venue; use FS-FHSS to select the hopping technology, monitor the wireless environment of the site before use, select the frequency points that can be used, and hop between multiple alternate frequency points during use. Work, effectively avoid interference sources; use high-efficiency digital audio codec technology to achieve 4 channels of voice transmission at a frequency point, 8 channels of simultaneous transmission only need two frequency points to complete communication, because the system occupies low frequency of radio frequency resources, and adopts Frequency hopping work, the system can be used together with WIFI or other 2.4GHz systems, without interference; digital audio encryption and digital modulation, data confidentiality, to prevent eavesdropping, to avoid malicious interference; signal transmission power can be adjusted according to the actual use of the venue, adjustment range It can be realized from 50 meters to 500 meters (special customization of the system, which can achieve 2000 meters coverage).
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