PURPOSE: To attain 3 functions of telephone function, interphone function and audio function by providing a hand-free talking circuit connecting to a telephone slave set or an interphone and a circuit sending an output of an audio equipment to the hand-free telephone slave set via a master set respectively.
CONSTITUTION: A master set 11 is so configurated that a 2-wire telephone slave set 13, an interphone 14 and audio equipments 15 (such as radio receiver, television receiver, CD player, tape recorder) are connectable to the master set 11 in addition to a hand-free telephone set 12. The hand-free telephone set 12 connects a hand-free telephone speech circuit 37 to a talking line connecting to a 2-wire telephone slave set 13 or an interphone 14 via the master set 11 and provided with an audio output circuit 50 able to send a BGM of the audio equipment 15 via the master set 11. Thus, the 3 functions as telephone function, interphone function and audio function are obtained with a small sized and simple system without a tuner circuit.
KAKEYA NOBUKAZU
SASAKI SHIGERU
| JPS63292862A | 1988-11-30 | |||
| JPS63187846A | 1988-08-03 | |||
| JPS623152B2 | 1987-01-23 | |||
| JPS59181760A | 1984-10-16 |