A search tree such as that suggested would generally be used for searching
multiple complex inter-related data. For the small set of symbols covered
here here, a direct addressed parallel memory based approach may be better.
I suggest using a few memory cells technology based on an organo - chemical
storage medium. Interfacing to the individual cells can be made with low
level electrical signals; such as those that may be generated by, for
example, dual stereoscopic visual or audio sensors.
Programming the memory can be difficult, often write times are measured in
weeks and in some cases even years, but once programmed can usualy be
regarded as non-volatile provided several refresh cycles are made from time
to time. Read time is variable and often depends on time of day, the
total number of read cycles ever made over the life span, and the age of
the memory cells.
... no excuses, using the attached "Morse-Code-Chart" (hope
the 13 kB jpeg
makes it through the reflector ...), you can look up each individual
letter, probably not at 25 wpm, but at the usual speeds on LF, and
especially using Slow-CW (remember: LF-Enthusiasts do it
Geri, DK8KW (W1KW)
P.S.: My best guess of those curves were that it was some
activity of some mentally pretty unhealthy person ...
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