| http://www.w3.org/ns/prov#value | - PLL 20 includes an input 20A and an output 20B. A substantially periodic line frequency signal, exhibiting a line frequency, FL, of 50 Hz, 60 Hz, 400 Hz, for example, or other line frequency, is coupled to PLL input 20A. For purposes of this example, the line frequency FL supplied to PLL input 20A is 60 Hz, although this is not to be taken as being in any way limiting.
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