| 摘要 |
A method of providing a value for each element of a sequence of elements in a converter, the values being for a present conversion cycle in operation of the converter, wherein a pointer position identifies an element in the sequence of elements for a conversion cycle. The method comprising: calculating a pointer position for the present conversion cycle (Pi+1) in accordance with an Nth order noise shaped function based on pointer positions for N previous conversion cycles (Pi to Pi-(N-1)); determining if the pointer position for the present conversion cycle (Pi+1) is in excess of the number of elements in the sequence; attributing a first component-value to all of the elements, comprising: attributing a first component-value of +1 if the pointer position for the present conversion cycle (Pi+1) is in excess of the number of elements in the sequence; and attributing a first component-value of −1 if the pointer position for the present conversion cycle (Pi+1) is not in excess of the number of elements in the sequence; updating the new pointer position (Pi+1) by performing a modulo operation and replacing the new pointer position (Pi+1) with the remainder value; attributing a second component-value to the elements in accordance with a (N−1)th order algorithm; attributing a third component-value to the elements in accordance with the inverse of the second component-value for the previous conversion cycle; and adding the first, second and third component-values for each element in order to provide a value for each of the elements for the present conversion cycle.
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