| http://www.w3.org/ns/prov#value | - Subsequently, a mechanism for detecting the dial tone signal according to the first embodiment will be described in detail with reference to FIGS. 4A, 4B and 4C. That is, FIGS. 4A, 4B and 4C conceptually indicate plural kinds of signals which are represented in a case where their vertical axes correspond to signal levels (magnitudes) and their horizontal axes correspond to signal frequencies.
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