Speech Recognition with Python

Written by Jaganadh Gopinadhan

Recently I saw a talk in listed in the CMU Sphinx site about Speech recognition with Python and Pocket Sphinx. I have downloaded the video and replicated the experiments. It was successful . To play with Python and speech recognition we have to install the following packages. python-pocketsphinx pocketsphinx-lm-wsj pocketsphinx-hmm-wsj

These three packages are available in the Ubuntu repo. So using apt-get install you can install it.

If you are using fedora install the following packages with yum :

pocketsphinx-devel
pocketsphinx-libs
pocketsphinx-plugin
pocketsphinx-python
pocketsphinx

The language model and hmm files are not available in the fedora repo so I downloaded the source files from http://packages.ubuntu.com/en/maverick/pocketsphinx-lm-wsj and http://packages.ubuntu.com/fi/maverick/pocketsphinx-lm-wsj .

Then following the instruction in the video I prepared a python code. To test the code I used wav files from NLTK data (timit corpus).

The python code which I used is given below The code is available at my bitbucket “http://bitbucket.org/jaganadhg/blog/src/tip/asr/asr.py”

#!/usr/bin/env python

import sys,os



def decodeSpeech(hmmd,lmdir,dictp,wavfile):

	"""

	Decodes a speech file

	"""

	try:

		import pocketsphinx as ps

		import sphinxbase

	except:

		print """Pocket sphinx and sphixbase is not installed

		in your system. Please install it with package manager.

		"""

	speechRec = ps.Decoder(hmm = hmmd, lm = lmdir, dict = dictp)

	wavFile = file(wavfile,'rb')

	wavFile.seek(44)

	speechRec.decode_raw(wavFile)

	result = speechRec.get_hyp()



	return result[0]



if __name__ == "__main__":

	hmdir = "/home/jaganadhg/Desktop/Docs_New/kgisl/model/hmm/wsj1"

	lmd = "/home/jaganadhg/Desktop/Docs_New/kgisl/model/lm/wsj/wlist5o.3e-7.vp.tg.lm.DMP"

	dictd = "/home/jaganadhg/Desktop/Docs_New/kgisl/model/lm/wsj/wlist5o.dic"

	wavfile = "/home/jaganadhg/Desktop/Docs_New/kgisl/sa1.wav"

	recognised = decodeSpeech(hmdir,lmd,dictd,wavfile)

	print "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"

	print recognised

	print "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"

Happy Hacking

Migrated from my old blog jaganadhg.freeflux.net

Written on October 26, 2010
The Opinions Expressed In This Post Are My Own And Not Necessarily Those Of My Employer.
[ Python  Speech Recognition  ASR  Automatic Speech Recognition  ]