signal power estimation

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Dear Kaz

I've got the point. That seems a nice solution !

But if i want to implement the adder in a cascaded stages style I have to do it by hand.. I was thinking about something recursive:

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using parallel adders wastes massive number of adders (2^10 for just first stage). One accumulator will do equivalent job but needs reset to start and it is slow i.e. result will be available after 2^20 samples gone through but for rms it should do.