| http://www.w3.org/ns/prov#value | - Then, the detector 34 generates a substantially in-phase component 40 delayed by 2n signal periods, preferably 2 periods, with respect to the sample signal component 40' aliased in the vicinity of the zero frequency, where n is a positive integer, as illustrated in FIGS. 4A and 4B. Then the detector 34 detects a phase inversion in the disable tone by means of an XOR operation executed between the
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