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Re: speech recognition help

Tim Chase
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> do u know which one
> 1. cmu sphinx
> 2. natural speaking
> 3. windows sapi
> is best ( in accuray and speed ) for predefined vocabulary.. and worth for
> learning as well.?

For a pre-defined vocabulary, they should all be pretty good. In
general (for non-predefined vocabularies), I've heard that NS
beats both Sphinx and SAPI in terms of recognition quality. I
haven't seen any comparisons between Sphinx and SAPI.

Other considerations may also come into play:

- do you expect all your users to have a copy of NS? Then you
might have to look into something other than NS if they won't.
Or perhaps NS has a developers' toolkit that allows for
redistribution when built into your app.

- do you expect all your users to run Windows (as I type this
from my Linux box...)? If not, then SAPI won't be available to
your Mac/Linux/BSD/BeOS/Amiga/whatever users.

- do you need TTS (text-to-speech) capabilities as well? SAPI
includes them. (there are other TTS libraries available such as
mbrola/festival that are available for this if needed)

- how easy is it to bind to Python? Sphinx has Python bindings
detailed on the website. I can't speak for NS or SAPI.

- how much time/money do you have to invest? Sphinx is
open-source and free. SAPI is free-ish for developers, but I
don't know if Microsoft incurs a licensing cost for distributed
apps or other redistribution restrictions. I can't speak for

Just a few thoughts,


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