Detailed explanation of three transmission methods of wireless video module[Copy link]
The wireless video module is mainly composed of a transmitter, a receiver and a controller. The wireless video module is a module that uses wireless technology for wireless transmission. It is widely used in wireless communications, video surveillance and other fields. The following is a detailed explanation of the three transmission methods of the wireless video module: 1. Wireless SmartAir transmission SmartAir technology is the only single-antenna mode gigabit wireless high-speed transmission technology in the current communications industry. It uses multi-band OFDM air interface technology, TDMA low-latency scheduling technology, and advanced wireless communication technologies such as low-density parity check code LDPC, adaptive modulation coding AMC and hybrid automatic retransmission HARQ to achieve a transmission rate of 1Gbps. 2. Twisted pair transmission It is also a type of video baseband transmission, which converts the 75Ω unbalanced mode into a balanced mode for transmission. It is a solution to the transmission of surveillance images within 1 km, where the electromagnetic environment is relatively complex and the occasion is relatively good. The surveillance image signal processing is transmitted in a balanced and symmetrical manner. Its advantages are: simple wiring, low cost, and strong anti-common mode interference performance. Its disadvantages are: it can only solve the transmission of surveillance images within 1 km, and one twisted pair can only transmit one image, which is not suitable for large and medium-sized surveillance; the texture of the twisted pair is fragile and the anti-aging ability is poor, which is not suitable for field transmission; the high-frequency component of the twisted pair transmission is greatly attenuated, and the image color will be greatly lost. 3. Video baseband transmission It is the most traditional TV surveillance transmission method. It does not process the 0-6MHz video baseband signal and directly transmits the analog signal through the coaxial cable (unbalanced). Its advantages are: small loss of image signal in short-distance transmission, low cost, and stable system. Disadvantages: short transmission distance, high-frequency components attenuate greatly above 300 meters, and image quality cannot be guaranteed; one cable is required for one video signal, and another cable is required for transmission of control signals; its structure is a star structure, with large wiring volume, difficult maintenance, and poor scalability, suitable for small systems.
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