PURPOSE:To attain data communication as well by bypassing a Reed-Solomon encoder/decoder and an interleaver/de-interleaver at the time of voice signal, altering the bit rate of a PSK MODEM, and eliminating the time delay of voice communication. CONSTITUTION:A signal switch 22 outputs an output signal from a data input terminal 1 as it is according to a control signal inputted from a control terminal 21 at the time of the voice communication, and outputs the output signal of an interleaver 3 at the time of the data communication. The control signal inputted from the control terminal 21 is generated by manual switching. On the other hand, when a Reed-Solomon encoder 2 and the interleaver 3 are bypassed, since the addition of a check symbol is eliminated, a data bit inputted to a convolution encoder 4 is changed. For this reason, a PSK modulator 23 is made into a bit rate variable type, and by changing the bit rate by the control signal, the converter can cope with the switching. By the switching, the time delay in the voice communication is eliminated, and near BER=1X103, the deterioration of the error rate is made negligible.
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