| 摘要 |
PROBLEM TO BE SOLVED: To accelerate data transmission without inviting an increase in costs by providing a demodulating means which performs septenary conversion of data inputted through an antenna after performing octonary demodulation of the data. SOLUTION: A modulator 10 as a modulating means performs septenary conversion of inputted voice or other data and subsequently modulates the voice or the data by using a carrier. An amplifier 11 amplifies an output from the modulator 10 with a prescribed value. A DUP 12 transmits a signal amplified by the amplifier 11 from an antenna 17. Then, an amplifier 13 amplifies a signal fetched through the antenna 17 and the DUP 12 with a prescribed value. An intermediate frequency amplifier 15 amplifies the intermediate frequency of the signal amplified by the amplifier 13. A demodulator 16 as a demodulating means also demodulates and outputs the intermediate frequency amplified by the amplifier 15. Then, the demodulator 16 performs octonary demodulation of the inputted voice or the other data and subsequently performs septenary conversion.
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