Hello Bill!
>
>Hmm.  How tiny can you make a SW touchtone decoder if you only want to
>decode four "buttons" (ie one row or one column of the matrix...)
>
>BillW
>
 Why do you think I want to  decode only four? I need algorythm (I do
not know how to do it) of analysing for sum of two frequencies - not
exactly DTMF, but in my project is also sum of two (table 2  of 6) non
stop frequencies (it is not like DTMF, where after tone going pause).
                   Bye. Alex Melven.

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