| 摘要 |
A circuit and method for the display of a high frequency periodic signal on a display (21) having a maximum response frequency less than the periodic signal frequency includes a signal period counter (12) for counting the number of periods in the high frequency periodic signal, a sampling control counter (16) for counting at a frequency substantially greater than the frequency of the high frequency periodic signal, and a comparator (17) for comparing the counts in the signal period counter (12) and the sampling control counter (16) and indicating a match thereof. When a match count is indicated, some electrical parameter of the high frequency periodic signal is sampled and held by a sample and hold circuit (20) until the next match count is indicated, thereby accurately reproducing the high frequency periodic signal at another frequency in a range of frequencies from zero up to and including the maximum response frequencies of the display.
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