ANALOG/DIGITAL COMMUNICATION SYSTEM

摘要

a modem chip (23); a central control means (22) connected to the modem chip (23); an interface input/ output port (26) connected to both the modem chip (23) and the central control means (22); a relay circuit (25) connected to both the input/output port (26) and the modem chip (23); and a line matching circuit (24) connected to both the relay circuit (25) and the modem chip (23). The apparatus further includes: a ring tone detecting means (27) connected to both the line matching circuit (24) and the input/output port (26); a transmission detecting circuit (28) connected to both the line matching circuit (24) and the input/output port (26); and a speaker circuit (29) connected to the input/output port (26). The apparatus performs both audio and data communications through a single telephone line.