| 摘要 |
PURPOSE:To reproduce surely a data and to attain the data communication with high transmission efficiency without error by sending a data to be sent while switching low/high speed modulations via forming coding by an error detection code and blocking by plural frames. CONSTITUTION:After an input data from a transmission terminal equipment 1 is subject to error detection coding by a coder 2, the result is coded by using an error correction code. The coded data is modulated by a high speed modulator 3 and sent to the reception side, while a control signal from a control signal transmission 4 is modulated by a low speed modulator 5 by the instruction of a controller 8 and sent to the reception side. A low speed demodulator 12 at the reception side demodulates the control signal, which is received by a control signal receiver 13. When a data succeeding to the control signal exists, the demodulator is switched into a high speed demodulator 9 by the instruction of a controller 14 then the data is received. The received data is inputted to a decoder 10, where the data is decoded by using the error correction code, then the result is sent to a reception terminal equipment 11.
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