| 摘要 |
<p>PURPOSE:To grasp an accurate state and to realize a simple device at low cost in the titled system which informs the present situation of plural groups which are capable of a homogeneous action, by combining a prescribed frequency of each group and another frequency of each situation for information. CONSTITUTION:An individual input line is used to an information process center, and frequencies Fs1-Fsn corresponding to situations are combined with prescribed frequencies Ff1-Ffn to each group to use the double frequency signal. As a result, the present situation of each group is informed in a simple way. Thus the display and discrimination can be simplified also at the information process center to eliminate an erroneous discrimination. Furthermore the device is miniaturized at low cost. Thus an accurate grasp is possible for the state of each group although the information is supplied to a center at the same time from plural areas.</p> |
