| http://www.w3.org/ns/prov#value | - A tracking control system as claimed in claim 13 in which said central processing unit generates a digital comparison signal for causing said first digital-to-analog converter to generate a staircase having a level which successively increases in a maximum of 2n+i steps within one sampling interval, where n is an integer greater than one and i is a positive integer smaller than n, said central pro
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