Ops! I forgot the little detail of finding a morse code coded with 0 and
1 in
such a table...

Well, if the conversion is made "on the fly", it seems rather easy. All
we need is
the length of the morse symbol. And that's just a counter. Comparison
will have to
be more complicated, since the key to find a letter will consist of the
symbol and
the length...
We could have several tables like this:
Length 1: E T
Length 2: A I M N
Length 3: D G K O R S U W
Length 4: B C F H J L P Q V X Y Z
Length 5: 0 1 2 3 4 5 6 7 8 9

Or maybe someone can come up with a logical operation to combine the
length and the code, producing an unique key...

Nuno.

Nuno Pedrosa wrote:
>
> I am a scout, and was thinking of this recently, to use in my Palm 3.
>
> In morse, there are 3 symbols: dot, dash and space.
>
> You can't translate a morse message like:
>
> ......-...-..---
>
> Without pauses, you will have many possible combinations!
> It could be possible to generate the most probable message, but
> it would be very difficult to get the exact one!
>
> .... . .-.. .-.. ---
>
> Having the symbols separated and encoded like Gavin said,
> why not just implementing a 2-way table?
>
> To detect the symbols, we could have 3 configurable times:
>
>  - dot time
>  - hash time
>  - space time
>
> Use a TMR and a pin with interrupt on change. Measure the
> value and the length of the value. Doesn't seem very hard,
> but, then again, I'm just talking... 8)
>
> By the way, for those who don't have a morse table handy,
> I said
>
> h e l l o
>
> Comments, anyone?
>
> Nuno.
>
> Gavin Jackson wrote:
> >
> > The first thing that comes to mind is to decode the
> > dot dash dash dot into 0110 with a '1' representing
> > dash and a '0' representing the dot. Then store a
> > table in the PIC and do a simple compare through
> > the table until a match is found. The only problem
> > I see with this method is trying to tell the difference
> > between a J ( . - - - ) and a 2 ( . . - - - ) which would be
> > 0111 and 00111 respectively.
> >
> > Maybe this gives you some other ideas.
> >
> > Regards
> >
> > Gavin
>
> --
> ----  ~~~~~~  --------  Nuno Filipe Freitas Pedrosa
> --  ~~~~     ~~  -----  SIEMENS S.A. Portugal       TEL: +351 1 4242454
> -  ~~~~       ~~  ----  mailto:Nuno.Pedrosa@oen.siemens.de
> -  ~~~~       ~~  ----  "Smile, and tomorrow will be a better day!"
> =======================================================================

--
----  ~~~~~~  --------  Nuno Filipe Freitas Pedrosa
--  ~~~~     ~~  -----  SIEMENS S.A. Portugal       TEL: +351 1 4242454
-  ~~~~       ~~  ----  mailto:Nuno.Pedrosa@oen.siemens.de
-  ~~~~       ~~  ----  "Smile, and tomorrow will be a better day!"
=======================================================================