Disclosed is a phase angle data-trigonometric function valueconverter circuit for computing a trigonometric function valuecorresponding to an angle that an angle of 360 degrees is dividedinto n equal parts, where n is an integer, which has: means forconverting the integer n into angle data represented by binarysystem; a sine value data memory which stores sine valuescorresponding to the angle data from zero degree to 90 degreesand outputs sine values corresponding to the angle data to beinput thereto; a cosine value data memory which stores cosinevalues corresponding to the angle data from zero degree to 90degrees and outputs cosine values corresponding to the angle datato be input thereto; a selector to which the sine values outputfrom the sine value data memory and the cosine values output fromthe cosine value memory are input and which selects the sinevalues or the cosine values according to the angle data andoutputs them; and means for adding a polarity sign to the sinevalues or cosine values output from the selector according to theangle data.
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