| 摘要 |
In a modem apparatus including a modem circuit, operatively connected to a computer and a communication line, a ringing signal detector detects a ringing signal received through the communication line, generates a detection signal, and then, outputs the detection signal to the modem circuit. A register receives from the host computer instruction data for instructing the ringing signal detector to output the detection signal, and then, stores therein the instruction data. Then, the ringing signal detector outputs the detection signal to the modem circuit when the instruction data is stored in the register. A pseudo ring signal generator outputs a pseudo ring signal in response to instruction data being stored in the register by the host computer. A signal frequency selection circuit instructs and controls the pseudo ring signal generator, in response to the instruction data to select the signal frequency of the pseudo ringing signal. A timing chart controller may also be used to control the pseudo ringing signal generator according to instruction data being written into the register by the host computer./!
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