| 摘要 |
PROBLEM TO BE SOLVED: To prevent prank calls. SOLUTION: A trigger signal reception means for receiving a trigger signal from a transmitter, a password storage means for storing a password, and a recording means are installed. The trigger signal is received and then the password is received, and only when the password is matched with that stored in the password storage means, is a call permitted. When they do not match, a sound signal from the transmitter is connected to the recording means.
|
