| 摘要 |
<p>A circuit addition is described for a digital, gray scale CRT display circuit to substantially reduce glitch distortion during CRT beam intensity changes. A high pass filter and DC restoration circuit couples the control grid of the CRT to the video amplifier such that the cathode and control grid substantially track each other during a glitch. This results in no substantial change in beam intensity as would otherwise be perceived during a glitch. This is accomplished without signal conditioning prior to the output of the video amplifier circuit by means of either delaying the higher order bits of the binary value corresponding to the desired intensity level or sampling and holding the analog output of the D/A converter prior to application of that signal to the video amplifier.</p> |
