| 摘要 |
PURPOSE:To preclude the possibility of allowing a possessor of a slave set to acquire an erroneous message by detecting a reception input level and devising the titled system such that a call is received when the detected level reaches a prescribed value or below but no message from a master set is displayed. CONSTITUTION:When a signal from the master set 1 is received, whether or not the relevant slave set is called is discriminated by looking into the coincidence between an ID number in the reception signal and the ID number stored in its own station and the calling state is informed by ringing of a ringing section 9. Then the result of comparison between the detected level of the received input and a reference level is discriminated and when the detected level is loss than the reference level or below, no message display is applied and an indicator signifying the presence of a call but not displaying it is lighted. Thus, the user of the slave set is not affected by the acquisition of the erroneous message affected by noise or the like and only the information with high reliability is acquired. |
