| 摘要 |
PURPOSE:To attain to listen to large music sound by connecting a resistor between two telephone lines in pairs to connect an external extracting terminal across the resistor. CONSTITUTION:A handset is hooked off, an incoming subscriber broadcasting music at the other side of an exchange 12 is called by using a transmission circuit 24, and when a caller is connected to the incoming subscriber to close a switch SW, the handset is hooked up to open a contact of a hook switch HS and the music from the incoming subscriber is given to a speaker 32. Since both the transmission circuit and the receiving circuit are disconnected from a telephone line during the receiving of music, production of howling is not cared and all music signal currents flow to external extracting terminals, a large music sound is listened to. |
