| 摘要 |
The cathode ray beam current in a storage tube, for example, is made accurately controllable over at least a 10,000 to 1 range, despite sweep speed variations and/or different modes of operation, by generating two out of phase pulse trains wherein the pulse duty cycles are made responsive to the modes of operation and/or sweep speed variations. One of the pulse trains is then amplitude modulated by the video. This pulse train is applied to the cathode. The unmodulated pulse train is applied to the control grid of the storage tube. Thereby compensation is provided in the cathode ray beam current for mode and/or sweep speed variations which may otherwise adversely effect the information being displayed and also for enabling an accurate display of the information contained in the video signals.
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