| prov:value
| - For illustration purpose only, the present application will describe three transform signals F1, F2, F3. [0694] A series of first differentiator circuits, 3033, 3034, 3035, provide first differential signals F???1, F???2, F???3 of the transform signals F1, F2, F3, with respect to time, or with respect to another factor, such as frequency.
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