| 摘要 |
PURPOSE: To simplify the configuration of a modulation circuit and a demodulation circuit when a modulated wave is sent for transmission reception of a digital signal in the digital signal transmission reception system. CONSTITUTION: A 1st digital signal S15 having a transmission rate of a 1st frequency is given to a band pass means 20, from which a 2nd digital signal S16 whose center frequency of pass band is a 2nd frequency being an integer multiple of the 1st frequency is generated. The 2nd digital signal S16 is given to a D/A converter means 8, from which a modulated wave S11 having a carrier S17 of the 2nd frequency is generated and an A/D converter circuit 12 samples the modulated wave S11. |
