| 摘要 |
In a telephone apparatus, a modem device, a computer apparatus and a communication terminal device, the connection to different kinds of communication networks is realized with a simple structure. A data input/output means for converting a received analog signal into reception digital data to be supplied to a computer apparatus and for converting transmission digital data which is sent from the computer apparatus into an analog signal to be transmitted, a sound input/output means for inputting and outputting sound based on an output sound signal and an input sound signal, and a connection switching means for connecting the telephone circuit to the sound input/output means in the case of connecting to another telephone apparatus and, in the case of connecting to another computer apparatus, for connecting the computer apparatus to the sound input/output means are provided, and in addition, an output sound signal extracted by the computer from the reception digital data is outputted from the sound input/output means and an inputted input sound signal is converted into transmission digital data by the computer apparatus, so that sound can be inputted and outputted via a common sound input/output means in the case of connecting to another telephone apparatus or another computer apparatus.
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