| 摘要 |
PURPOSE:To decrease the effect onto an adjacent channel by setting a code before and after the timing of a modulation wave to be subject to ON/OFF into opposite polarity in applying ON/OFF control to the modulated wave adopting the digital modulation system among plural modulation waves. CONSTITUTION:A binary I code string 23 and a binary Q code string 24 from a frame format generating circuit 1 of a burst modulation wave are added by an adder 8 and outputted via inverting code insertion circuits 13, 14, NRZ waveform converting circuit 2, 3, band limit filters 4, 5 and double balanced mixers 6, 7 respectively. An inverting code insertion timing control circuit 15 controls inversion code insertion circuits 13, 14 to set the code before and after the timing subject to ON/OFF for the modulation wave is set to opposite polarity. |
