| 摘要 |
A voice frequency communication apparatus which is capable of detecting and processing the voice frequency terminal signal and non-voice frequency terminal signal and is also capable of realizing communication with ordinary voice frequency terminal signal and non-voice frequency terminal signal without erroneous changeover of the signal processing path because of always monitoring the sending/receiving data with CPU because of providing the constitution to always monitor the sending/receiving data by providing a central control circuit (CPU) having the constitution to always monitor the digital signal output of the detection circuit having the fuction to convert, when the analog input signal is non-voice frequency terminal signal, such non-voice frequency terminal signal into the digital data signal after detecting such signal and to convert, on the contrary, the digital data signal into the analog non-voice frequency terminal signal and the digital data signal to be input from the digital communication line through the communication line I/F circuit and also monitoring such signals.
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