That I can open by considering the average amplitude.

For example, for the first window, the average amplitude was 0.55, and

0.55 is in range B.

So I cancel the represented window with symbol B.

My second window had average amplitude of 0.95.

0.95 is in range A.

So I can replace and represent that window with symbol A.

My third window had an average amplitude 0.48.

0.48 is, once again, in range B.

So I can represent with symbol B, and so on, and so on, and so on.

So what happened?

I took a long time series with many entries,

and I converted that into a compact string.

In this case, my string is B, A,

B, D, F, E, B, a compact string

that represent the shape of the time series.

Now that I lost the details, but

my string justly represents the shape of my time series.