Lpc2000

----- Original Message ----- 
From: "dsidlauskas1" <dsidlauskas@...>
To: <lpc2000@yahoogroups.com>
Sent: Thursday, March 30, 2006 4:16 PM
Subject: [lpc2000] Speech Recognition Software


> I'm looking for some simple speech recognition software to run on a
> 2138.
>
> It only need recognize imdividualy spoken numbers and letters, and a
> few words such as "yes" and "no".
>
> Does anyone have a suggestion?

Speaker-independent or -dependent? If the latter, the old technique of using 
a bank of op-amp band-pass filters and comparators, implemented in software, 
should work. Many years ago I played with a speech recognition unit for the 
TRS-80 that used that technique, and it worked quite well. The microphone 
had a PTT button, IIRC, and one pressed the button, spoke the word, and 
released it. The system had to be trained several times on each word; the 
software averaged the values and stored a template. When recognising words, 
the utterance was analysed by the filters and compared with each template in 
turn, and the best match was output as the recognised word. I think it could 
handle a maximum of 32 words.

These days, one would use an FFT for the frequency analysis.

Leon
--
Leon Heller, G1HSM
leon.heller@...
http://www.geocities.com/leon_heller