| 摘要 |
PURPOSE:To activate a remote apparatus at an optional time from any place where a telephone set is located by utilizing a bell tone of a telephone set used in a conventional household. CONSTITUTION:The user sets an optional numeral, e.g., [3] by using a digital switch 5 in advance. When the user makes a telephone call from a telephone set at any place apart from the location where the apparatus being an example of this execution is set at any time by designating a telephone number of the telephone set 1 to which the apparatus being the example of this execution is set, the bell of this telephone set 1 rings. Then a microphone 2 set in the vicinity of the telephone set 1 detects this bell tone and converts it into an electric signal. This electric signal is inputted to a signal amplifier circuit 3. A digital counter 4 has a function counting up the internal count value in a 4-digit binary number. A relay 10 is constituted that its contact is closed when a relay driver 9 is turned on. |
