HAND-FREE INTERPHONE AND HAND-FREE INTERPHONE SYSTEM FOR MULTIPLE HOUSING USING THE INTERPHONE

摘要

PURPOSE: To provide the hand-free interphone, where the speaking time extending operation can be performed by displaying a notice when approaching time-up for speaking, and the hand-free interphone system using the hand-free interphone. ;CONSTITUTION: A speaking time-up notice means 1 having a speaking time-up indicator lamp which is lit or flickered at the time of elapse of a prescribed time before expiration of the preliminarily set speaking time after the start of speaking, a hand-free speech control circuit 2 which connects speaking means Sp and Mic to a speech line L by a speech switch SW and disconnects speech means Sp and Mic from the speech line L at the time of expiration of the preliminarily set speaking time, and a control means 3 which has a speech extending switch SW and a timer means and inhibits the disconnecting operation between speech means Sp and Mic and a speech line L1 due to the hand-free speech control circuit 2 at the time of operating the speech extending switch SW and keeps speech means Sp and Mic connected to the speech line L only for a preliminarily set time are provided.;COPYRIGHT: (C)1995,JPO