>>8938519

If the image is any clue, it can refer to the summation of electric waves that occurs when interfering said waves in a target interference zone … within a human brain.

Physics teaches that when waves are combined in an interference zone, new waves are formed consisting of sum, product, etc. of the source waves. Instantaneous voltages sum at every (X,Y,Z,t) (space-time) coordinate. The resulting peaks and troughs form different frequencies and amplitudes than either of the individual source waves considered in isolation.

When the signals are modulated, the result becomes more complex to imagine, but can be modelled and calculated mathematically, and can be detected and measured empirically.

The advent of digital signal processors (DSPs) made this kind of analysis in realtime, by Fourier transforms, or signal generation to produce an intended result, feasible, in fact trivial.

DSPs started to come into commercial use in the early to mid 1990s. I presume they were available in the military domain much earlier.

>>8938618

>electric

correction: electromagnetic

>>8938618

Image 1 example. Bottom diagram shows two waves of different frequencies. Top diagram shows when happens when the 2 waves are summed together. If you've ever played around with an oscilloscope you have seen these kinds of waveforms and intuitively understand about adding waveforms together to produce resultant waves that differ from either of the individual inputs.

>>8938564

>Do you know what Six Sigma is? Planning. Who created it? Who uses it now?

Big corporations use it in doing quantitative quality control, in manufacturing, design, process control, etc. It enables a precise prediction or analysis of just how accurate a process can be.

It is also used in intelligence operations to evaluate intelligence. A 6-sigma signal is so statistically unlikely as to be equivalent to a proven fact. When you are gathering up bits of info in an intelligence op – let's say 2nd hand or 3rd hand info or hearsay – one or two bits of info don't prove anything, but when the quantity of mutually-supporting correlated info is large enough to form a 6-sigma statistical anomaly, it can be considered proven fact instead of speculation.

I presume this is the usage you are referring to.