| 摘要 |
The invention refers to a method and apparatus for sampling a quasi-stationary signal progressively during a sampling period comprising a plurality of successive periods of a fundamental component in the signal. The method comprises the steps of continuously counting during a plurality of successive sampling periods the actual number of periods of said fundamental component occurring after a selected starting sampling period, successively prolonging said sampling periods in dependence on the increasing magnitude of said counted number, and progressively sampling said signal during said successively prolonged sampling periods. |
