| 摘要 |
PURPOSE:To call a called party by a sound volume suitable for the call by a speaker adjusted by a called party through the remote control of a caller by adopting a design that the gain of a loudspeaker amplifier circuit outputting the call sound of the caller to the speaker is adjusted again independently by the remote control of the caller. CONSTITUTION:A sound signal from a caller is given to a loudspeaker amplifier circuit 3 outputting the call sound of the caller to a speaker via an ordering telephone line l and to a sound volume adjusting circuit 2 adjusting the sound volume of the speaker, a sound volume readjusting circuit 4 receiving the remote control of the caller and re-adjusting the gain of the circuit 3 independently of the adjusted value by the circuit 2 by the called party is connected to the sound volume adjusting circuit 2, and the sound volume re-adjusting circuit 4 is operated by a remote control signal from the caller through a remote control line 5. In making a call, the caller activates the sound volume re-adjustment circuit 4 through the remote control line 5, after the sound volume of the speaker is adjusted to a suitable sound volume by the called party to attain the call by the speaker.
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