Thread: [devel] PocketSphinx for Fremantle (Speech Recognition Engine)
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mc_teo is offline mc_teo
2011-04-27 , 15:11
Posts: 7 | Thanked: 47 times | Joined on Aug 2010
#1
Hello there, just a quick post on how I got PocketSphinx to work on my n900, as well as a basic python application to test your setup. I take no credit for anything on this thread, except the time spent putting these all together.


I downloaded all the .debs from http://repository.maemo.org/extras-d.../pocketsphinx/ into a new directory, removing any i386 specific .debs.

As root, I ran "dpkg -i *" and they tried to install, but were stopped, due to unment dependencies. (for me it was just python2.5-dbg)

This sucessfully ran, and installed pocketsphinx.

To try it out and make sure everything has installed correctly, run "pocketsphinx_continuous", and wait for everything to load. When prompted with "Ready..." say something clearly in the phones direction, (I used "Hello"). After another load of text there should be "000000001: hello (-12345676)".


To get the gstreamer hooks working, I had to install the package "gstreamer-tools".

After this I raw the Script here from the CMUSphinx example, tweaked to work for pulseaudio, http://pastebin.com/zCYzX65Z

Press the "Speak" button, then say your few words, and the textbox with update to show what you have said.

N.B. It uses the en_US acoustic model by default, therefore I had a good few mistakes at first which I attrute to my Irish accent.



This is another little sample that uses the JSGF grammer specification, and tries to interpret speech from a .wav file saved locally. (This needs to be recorded at 8khz mono, also)

==File grammer.jsgf==
PHP Code:
#JSGF V1.0;
grammar goforward;
public <move> = go <direction> <distance> [meter | meters];
<direction>= forward | backward;
<distance>= (one | two | three | four | five | six | seven | eight | nine | ten | twenty)+; 
==File speechtest.py== (with myrecording.wav as the recording to interpret)
PHP Code:
#!/usr/bin/python
import pocketsphinx as ps
decoder = ps.Decoder(jsgf=’/path/to/your/jsgf/grammar.jsgf’,samprate=’8000&#8242;)
fh = open(“myrecording.wav”, “rb”)
nsamp = decoder.decode_raw(fh)
hyp, uttid, score = decoder.get_hyp()
print “Got result %s %d” % (hyp, score) 
Last edited by chemist; 2011-04-27 at 15:17. Reason: topic
 

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