| http://www.w3.org/ns/prov#value | - As the output signals from the modems 613 a, 613 b, . . . , 613 n, for example, used are two kinds of frequency signals corresponding to digital signals ???1??? and ???0??? like frequency modulation, two kinds of phase signals corresponding to the two phases ???1??? and ???0??? like phase modulation, or the like.
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