| 摘要 |
PURPOSE:To attain much economy in comparison with a case providing a radio transmitter and a radio receiver on a pager and to miniaturize the title system by using a transmission means by a sound wave. CONSTITUTION:In case of calling a possessor of pagers 1-10 from an information center, an identification number of the pagers 1-10 of the called party called by a setting switch 94 installed to a setting section 93 is set to turn on a call button 95. The number is transmitted to all base stations 11-20 via a line concentrator 91 and the number is radiated from the base stations 11-20 as a sound signal. On the other hand, the pagers 1-10 of a number set by the setting switch 94 generate a reply signal (including an identification signal of a pager) in sound from speakers 31-40. Thus, the acceptance of a call is recognized by the possessor of the pagers 1-10 in this way and the base stations 11-20 detect the reply signal. Thus, economy and small size are attained. |
