| http://www.w3.org/ns/prov#value | - FIG. 7 is a graph explaining the fundamental concept of the embodiment achieved in accordance with the flow diagrams shown in FIGS. 6A and 6B. As shown as (2) in FIG. 7, let it be assumed that the push-button switch of the transmitter of the N-th channel, for example, is depressed at the first timing of the clock as (1) in FIG. 7.
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