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By PURPLELEC | 12 July 2024 | 0 Comments

Main technical indicators of video switchers

  The video switcher is a key device on the main control console in the control center. It is a device for selecting video image signals. Simply put, several video signals are input, and one of them is selected for output through control.
  Currently, video switchers mostly use analog switches made of integrated circuits. This form of switching control is convenient and easy to form a matrix switching form. The switching control signal can be encoded. The number of input and output channels of the video switcher and the arbitrary switching ratio can be selected according to the number of cameras in the system and the ratio of cameras to monitors.
video switchers
  Main technical indicators of video switchers:
  1. Switching ratio
  This indicator refers to the number of input channels of the switcher and the number of output channels after switching. If it is a matrix video switcher, the switching ratio can be arbitrarily selected through encoding. If the switching ratio is fixed, "four-choose-one", "six-choose-one" and so on are commonly used.
  2. Isolation
  This indicator measures the degree of isolation between the video signals and between them and the signals output after switching when multiple video signals are input to the switcher. It is generally expressed in decibels (dB). The higher the value of this indicator, the better.
  3. Differential gain DG, differential phase DP
  Differential gain DG refers to the degree of distortion in amplitude between the video signal output after switching and the signal before switching. The smaller the value of this indicator, the smaller the distortion. Differential phase DP refers to the distortion in phase between the video signal output after switching and the signal before switching. The smaller the value of this indicator, the smaller the distortion in phase. Generally, the DG of the video switcher used in the TV monitoring and control system is required to be ≤8% and ≤8°.
  4. Input level and output level
  Some video switchers also give technical indicators of input level (or input voltage) and output level (or output voltage). Input level refers to the requirement of the input end of the video switcher for the voltage amplitude of the input video signal, which is generally 0.8Vp-p to 1.2Vp-p; output level refers to the amplitude standard of the output voltage at the output end of the video switcher, which is generally 1Vp-p to 1.2Vp-p.

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