| 摘要 |
<p>A digital analyzer measures the synchronizing parameters of a color video signal, utilizing two microprocessor controlled time measuring blocks, one for relatively long time measurements and one for relatively short time measurements. The horizontal synchronizing signal and burst signal are extracted from the video signal and processed to obtain a vertical synchronizing signal, a field signal, a vertical pulse and equalizing signal, a burst flag signal, a burst position signal and a burst eraser signal. A multiplexer is utilized to select signals to be measured as a "window" signal for a clock signal. The measurement circuit for longer time measurements counts the number of clock pulses during the time "window". Shorter time measurements are made by gating the charging of a capacitor, the output voltage of which is converted to a digital signal by an analog to digital converter. A microprocessor controls the time measurements and displays the results on an LCD display and video monitor.</p> |
