In conventional security monitoring systems, image interference is a common issue that often fails to meet acceptance standards, causing significant challenges during project completion. This paper explores the effectiveness of using standard coaxial cables in reducing interference, focusing on how it addresses both the causes and solutions to such problems.
Image interference can arise from various sources, primarily categorized into three areas: connections, equipment, and transmission. Connection-related issues, such as "crossing," distortion, or flickering, are typically resolved by re-making BNC connectors. Equipment-related interference, like poor isolation in matrices or distributors, may result in misalignment or weak signals, which can be fixed by replacing faulty devices.
However, the most challenging type of interference comes from the transmission process itself. Common forms include electromagnetic interference (EMI), potential difference interference, AC power interference, and damage to cables during installation.
Electromagnetic interference is particularly prevalent in environments with large electrical equipment, such as industrial plants, elevators, and substations. EMI can cause visual distortions like "crossing," "corrugation," or random spots on the screen. Potential difference interference occurs when different parts of a system have varying electrical potentials, often seen in large-scale setups like campuses or urban monitoring networks. AC power interference is another major concern, especially when power lines and video cables are bundled together over long distances, leading to visible "wave" patterns on the display.
Cable damage during installation can also lead to interference, especially when multiple cables are twisted or pulled forcefully, causing internal shielding to be compromised. This can result in cross-talk and distorted images, particularly in dense monitoring environments.
To address these issues, the use of a common cable one-line transmission method has proven highly effective. This approach modulates video signals into a high-frequency band (47 MHz to 860 MHz), thereby avoiding the interference range of EMI and AC power. Unlike traditional point-to-point transmission, which operates at low frequencies (0-6 MHz), this method significantly enhances signal integrity and resistance to external noise.
Additionally, by reducing the number of cables needed, the common cable system minimizes the risk of physical damage during installation. For example, transmitting 16 channels via a single cable instead of 16 separate ones reduces the likelihood of human error and mechanical stress on the wiring.
In conclusion, the common cable one-line transmission method offers a robust and efficient solution to multiple types of interference in video surveillance systems. By addressing the root causes of interference, it provides a long-term, practical approach that is well-suited for widespread application.
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