| 摘要 |
PURPOSE:To obtain a control means for low frequency suppression integrating value for facilitating the reproduction of a pilot carrier by adopting a modulating system to cause a space-arranged signal point to be unsymmetrical to the component axis or to cause a code allocation to the signal point not to be an inversion relation related to the component axis. CONSTITUTION:In-phase component data Iin and orthogonal component data Qin to be modulated are converted to corresponding component values (x) and (y) of a coordinates system for converting a code absolute value by a converting part 4 for the polarity deciding system. The components (x) and (y) are used for generating the sum for one frame at linear frame integration arithmetic circuits 6x and 6y, and for respective sums, polarity signals are outputted from polarity deciding circuits 8x and 8y. The polarity signal for converting the code absolute value is used for converting the I and Q components from one frame delaying parts 2I and 2Q by a code converting part 10. For frame outputs from the code converting part 10, a code converting flag is inserted to the frame slot by a flag inserting part 12. Thus, the low frequency component suppression integrating value control circuit to suppress a low frequency component can be obtained. |
