Moving Sum

Christos · 2003-08-28T16:09:12+00:00

Hi to all,The sum or average of a certain number of samples (for ex. the last 100values received) have to be checked constantly against a threshold.I thought of implementing this by keeping a "Moving Sum" which will work byadding the new value and subtracting the oldest. I think that can beimplemented by adding to a register the value just arriving and subtractingthe value coming out of an 100 word deep shift register.Now, if a longer sum has to be checked then there is a memory problembecause a lot of values have to be stored. In addition more than one "MovingSums" is needed so if I use the above implementation I will have in additionto store the same data more than once (for ex. the 1000 word Shift Registerwill include the 100 word S.R. data).Any idea of how this could be implemented?The final system will have to keep 10 moving sums with the largest being250,000 (8-bit) values for each of the 16 independent input channels.Help to the design problem will be appreciated and acknowledged.Christos__________________________________________________Christos ZamantzasCERN, European Organization for Nuclear ResearchDiv. AB/BDI/BL tel: +41 22 767 3409CH-1211 Geneva 23 fax: +41 22 767 9560Switzerland __________________________________________________

Aug 28, 2003 20 Replies

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Moving Sum

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