Automatic low frequency gain limited circuit for eliminating signal suppression in an A-C coupled video processing system

DETAILED DESCRIPTION The present invention comprises an electronic means that is inserted in the video channels between the last post amplifier and the input to a light display device driver in which the electronic means limits the amplitude of the low frequency voltage component of the video signal at the input to the driver.
The electronic means reduces the gain of the low frequency signal component of the video signal when the voltage level exceeds the white streaking detection level, and likewise reduces the gain of the low frequency signal component when the voltage level goes below the black streaking detection level.
The gain of the high frequency component, which rides on the low frequency component, remains unchanged during this operation.
The electronic means comprises an inverter circuit that inverts the low frequency voltage component of the video signal when the video signal goes above the white streaking level amplitude or goes below the black streaking level amplitude and removes the high frequency voltage component resulting in a non-detail information inverted square wave that is summed with the original video signal in a summing amplifier.
The summed voltage contains the exact high frequency detail information but the low frequency voltage component is kept within the amplitude limits where no streaking occurs on the light display device.
The original detail information is preserved as well as the linear dynamic range of the A-C coupled video processing system.