> > I am working on a (hobby) project, trying to implement some kind of
system
> > that will be able to accept orders and act accordingly depending on the
> > order. To be more specific i want a -robotic- arm to move
> > up-down-left-right, when i say these (up down left right) words. I
decided
> > to build this system with use of neural networks (i have read that it
> gives
> > till now the most promisng results).


If it's end results that you want, then I suggest that the neural network
that is liable to give the best results is the one already in your head.
Limited vocabulary, single word, speaker dependent speech recognition is
well within the capability of current relatively bottom end processors with
a little hardware - especially if you are prepared to tweak the code and
parameters to suit your application. I saw an MC6802 based application at
least up to your requirement in a magazine some 15 years ago. AFAIR they
amplified the speech signal to a square wave and sampled it. Memory fades
but they MAY have had 3 opamp bandpass amplifiers on the input - but that is
probably a memory from another commercial system available in about 1980
that yielded OK results.

If you want easiest results then you can buy single IC based systems which
allow about 20 words of recognition. These have about ?4 key words which can
then be used to trigger selected secondary words. eg OPERATE Brakes, OPERATE
motor, ... . A few tens of $US AFAIR.

A number of commercial ICs exist

eg        http://www.futurlec.com/News/Philips/SpeechChip.html



        RM

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