SINE WAVE GENERATION CIRCUIT AND COSINE WAVE GENERATION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To reduce the cost and circuit scale. ;SOLUTION: A γ-sine γ value conversion table for 1/4 period is stored in the ROM part 4 of a numerical controlled transmitter 10. A phase identification part 2 identifies a phase θ generated by a phase generating part 1. A phase transforming part 3 transforms θ to γ based on a transforming expression according to an identifying result. A code transforming part 5 converts the sign of a sine γ value based on the identifying result to output as a sine θ value. Compared with the case of storing a θ-sine θ value conversion table for one period in the ROM part 4, the capacity of the part 4 can be small.;COPYRIGHT: (C)2000,JPO