| 摘要 |
PROBLEM TO BE SOLVED: To provide a square sum arithmetic circuit based on a superior ROM system with small ROM capacity for a digital signal processor used for various electrics. SOLUTION: Respective absolute value arithmetic means 1a to 1n generate the absolute values of inputs 1 to (n) and an adder 2 adds up the respective absolute values. Then a ROM 3 calculates the sum squares of vectors by using the sum inputted from the adder 2 as its address value and assigning as a data value the average of all vectors which are equal in the sum of absolute values. The ROM 3 of the digital signal processor which is thus constituted needs to have only a ROM capacity of as large as 2 raised to the (m+n-1)th power. Therefore, the sum of squares of vectors can be computed with ROM capacity which is much smaller than the ROM capacity of a conventional ROM system which is as large as 2 raised to the (m×n)th power. Here, (n) is the number of dimensions of an input vector and (m) is the number of configuration bits of each element.
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