What Is CM?

- Jul 18, 2018-

In a cable television system, when an amplifier amplifies a television signal of multiple channels, the image carrier of the desired channel is interfered by the amplitude variation of the modulated wave of the other (interfering) channel due to the influence of the nonlinear device in the amplifier (mainly three terms). This is called crosstalk modulation or cross modulation. A common phenomenon is the appearance of a negative image of an interfering channel image on the background of the image to be received. Sometimes the horizontal sync signal of the interfering channel is flipped over the image to be received, becoming a vertical white bar, and moving left and right (fixed when the line frequency is consistent), like the wiper of the front window of the car, hence the name "wiper jam". .



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