| 摘要 |
The periods of several successive cycles of an alternating signal are determined and used to calculate the value corresponding to the statistical variance thereof. The deviation value is compared with a preselected value corresponding to the maximum variance expected of an alternating signal with a substantially uniform period. If the preselected value exceeds the computed value, an alternating signal with a uniform period is present while if the computed value exceeds the preselected value an alternating signal with a non-uniform period is present.
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