| 摘要 |
PURPOSE:To remote control an objective circuit by the output of an AND circuit by providing two AND circuits that receive different call signals generated when a pocket bell is called successively by different telephone numbers and gives an output signal. CONSTITUTION:When an owner calls a pocket bell 1 from a remote telephone dialing the first telephone number out of two telephone numbers allotted to the pocket bell 1, the ringing tone of slow period is made loud by a speaker 2. The sound is picked up by a pickup 4 through a flag, converted to digital level by a transistor TR, and made to an envelope by a monostable multivibrator IC1. On the other hand, when the owner in a remote place receives a reply from a station after dialing the first telephone number, he cuts the phone once and dials the second telephone number at once. At this time, the ringing tone of quick period sounds and is enveloped by the IC1. Thus, by dialing two telephone numbers continuously, the remote control can be made surely. |
