| 摘要 |
PURPOSE:To diversify and improve the data communication service, by transmitting coded signal data and voice signal data with mixing and separating both the data clearly at the reception side. CONSTITUTION:A signal from a center device 1 is demodulated into a digital signal and outputted to a display 12 or a printer 13 via an interface circuit 11 at a control section 6. Since no switching control signal is transmitted from the section 6 to a changeover switch circuit 18, character or graphic data received from line 20 are inputted to a transmission control section 7 through the circuit 8. In case of voice data, the switching control signal is given to the circuits 8, 18 from the section 6, then the voice data received from the line 20 is branched just before the section 7 and outputted to a speaker 10 via the circuit 18 and an amplifier 9. Thus, a personnel at a terminal 5 listens to voice information. |
