In the monitoring system, if there is a phase difference between the field sync signals in the image signals output from each front-end device (such as a camera), the monitor will display a period of non-synchronization when the matrix controller switches the image signals of each channel. The larger the phase difference, the longer the time that is not synchronized. Therefore, it is recommended that when constructing a monitoring system, front-end devices with GEN-LOOK inputs should be used as much as possible, and all front-end devices should use external synchronization. That is, the synchronization of each image signal is controlled by the same synchronization signal. Causes the monitor screen to show sync.
When using the LCD monitor to observe the image, why does the image distortion, distortion, line and field synchronization, or even failure of the input signal occur?
First, the industry standard for LCD monitors specifies that professional LCD monitors have an input signal amplitude of 1Vp-P±3dB (approximately 0.7Vp-P-1.4Vp-p) and an input impedance of 75 ohms. Therefore, if the input signal is not standardized due to cable attenuation, impedance mismatch, or the BNC head of the transmission cable, the input signal amplitude is much lower than 0.7 pp; either the camera output is not regulated or some irregularity is connected. When the input signal (such as distributor, amplifier, etc.) causes the input signal amplitude to be much larger than 1.4Vp-p, it may cause image distortion, line and field synchronization, etc.
Second, due to the wide range of video frequency, video signals are more susceptible to interference during transmission (including 50Hz power interference, electromagnetic interference, etc.), thus affecting image quality. Severe disturbances may cause images to be distorted, deformed, raceways, and lines and fields to be out of sync. Therefore, during the installation of the monitoring system, the video line must be far away from sources of electromagnetic interference.
Third, the potential difference between the front-end device, the control host device, and the terminal device may also interfere with the video signal, resulting in distortion of the image signal or image appearance of a race track if the entire system is powered on (ie, the front-end device, the master When the control equipment and terminal equipment are connected to the BNC head to connect the front and rear equipment under power-on condition, it may be caused by the potential difference between the ground wire of the front and rear equipment (actually, the shielding layer of the transmission cable). Jumping over fire, this flashover will destroy the component at the input or the ground wire in the casserole of the PCB board. Causes the input to open circuit and input no image fault. Therefore, the construction of monitoring system engineering should be designed and constructed in strict accordance with the specifications. The grounding bus should use copper conductors with sufficient cross-sectional area to ensure that the ground-to-ground resistance of the front and rear ends is <1Ω. The grounding line must not form a closed loop, and must not be short-circuited or mixed with the strong grid neutral line.
When using the LCD monitor to observe the image, why does the image distortion, distortion, line and field synchronization, or even failure of the input signal occur?
First, the industry standard for LCD monitors specifies that professional LCD monitors have an input signal amplitude of 1Vp-P±3dB (approximately 0.7Vp-P-1.4Vp-p) and an input impedance of 75 ohms. Therefore, if the input signal is not standardized due to cable attenuation, impedance mismatch, or the BNC head of the transmission cable, the input signal amplitude is much lower than 0.7 pp; either the camera output is not regulated or some irregularity is connected. When the input signal (such as distributor, amplifier, etc.) causes the input signal amplitude to be much larger than 1.4Vp-p, it may cause image distortion, line and field synchronization, etc.
Second, due to the wide range of video frequency, video signals are more susceptible to interference during transmission (including 50Hz power interference, electromagnetic interference, etc.), thus affecting image quality. Severe disturbances may cause images to be distorted, deformed, raceways, and lines and fields to be out of sync. Therefore, during the installation of the monitoring system, the video line must be far away from sources of electromagnetic interference.
Third, the potential difference between the front-end device, the control host device, and the terminal device may also interfere with the video signal, resulting in distortion of the image signal or image appearance of a race track if the entire system is powered on (ie, the front-end device, the master When the control equipment and terminal equipment are connected to the BNC head to connect the front and rear equipment under power-on condition, it may be caused by the potential difference between the ground wire of the front and rear equipment (actually, the shielding layer of the transmission cable). Jumping over fire, this flashover will destroy the component at the input or the ground wire in the casserole of the PCB board. Causes the input to open circuit and input no image fault. Therefore, the construction of monitoring system engineering should be designed and constructed in strict accordance with the specifications. The grounding bus should use copper conductors with sufficient cross-sectional area to ensure that the ground-to-ground resistance of the front and rear ends is <1Ω. The grounding line must not form a closed loop, and must not be short-circuited or mixed with the strong grid neutral line.
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