# Finding the fundamental period by using four elementary operations (+,-,x,/)

The idea is to find the fundamental period of any periodic and bounded signal. This is all that we know about the signal. Nothing else. Only allowed operations are: $$+,-,\times , \div$$. We can also access any value of the signal that we desire.

How can a method be developed which finds or estimates the fundamental period of the given signal?

• I have posted a couple detailed answers to pitch detection using something like autocorrelation on this forum. I'm on a phone and it's too difficult to find them and point to them. – robert bristow-johnson Oct 22 '18 at 6:49

• In a computer, we call that a conditional "branch" or "jump" instruction. In C or C++, it's theif () {} statement. – robert bristow-johnson Oct 22 '18 at 6:54