Method of interpolating output from sensor

摘要

The period Tn needed to count a lowermost bit of a signal of which an absolute value of difference between a last real data theta (k) and a present real data theta (k+1) is assumed to be quantized in a data block period To is obtained. One digital quantity is successively accumulated on the present real data theta (k+1) every period Tn to obtain interpolation data C, D . . . . At the point t1 a final interpolation data G is adapted to be added or subtracted, the total of added or subtracted digital quantity exceeds the absolute value of difference. Accordingly, a final interpolation data G is held until a next real data theta (k+2) is output.