DEVICE AND METHOD FOR GENERATING TRIGONOMETRIC FUNCTION WAVE, AND DEVICE AND METHOD FOR OUTPUTTING COLOR SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a DDS (direct digital synthesizer) circuit as a trigonometric function wave generating device whose cost can be suppressed. SOLUTION: This trigonometric function wave generating device is configured as the following. A phase incremental valueθis calculated, and a sawtooth wave SW is outputted on the basis of a phase integrated valueθ1obtained by calculating the phase incremental valueθ. A parabolic signal P is outputted on the basis of the sawtooth wave SW. An error between the parabolic signal P and a sinusoidal signal is corrected for each phase X and the sinusoidal signal is outputted as a sinusoidal signal W1. In comparison with when data are read from a ROM in each phase to generate a sinusoidal signal or when Taylor series expansion is used to generate a sinusoidal signal, it is possible to easily output the sinusoidal signal W1 obtained by suppressing an error of a sinusoidal signal with a relatively small circuit scale to be able to suppress cost. COPYRIGHT: (C)2005,JPO&NCIPI