| 摘要 |
PROBLEM TO BE SOLVED: To attain a link between a control computer and plural telephone sets or a link between two or more telephone sets by preparing a communication channel circuit, a control channel circuit which transmits and receives a control signal, and an interface circuit which connects the communication and control channels to a communication path. SOLUTION: A PCIP(PC interactive phone) system 100 consists of plural PCIP adapters 102 which connect plural standard telephone sets 104 to an add-in PCIP link board 142 of a PC 141 via an indoor telephone line 101. The adapter 102 is provided with a high frequency transceiver and connected to the line 101 via a high frequency interface circuit. In such a constitution, the voice and control signals can be transmitted and received between the PC 141 and the adapter 102 and also between the adapters 102 without disturbing the voice band signal of the line 101. |
