How to use CMU Sphinx 4 for speech to text with english voxforge models

Question

I'm trying to figure out how to use sphinx4 or pocketsphinx with the english voxforge model but I can't get it working. I have tried to read doc pages (like this one http://cmusphinx.sourceforge.net/sphinx4/doc/UsingSphinxTrainModels.html ) but it does not help me.

What I want is an executable where I can specify which model to use and which audio file to use as source and have the executable print out it's best guess about what the voice on the recording says.

I hade some luck with: pocketsphinx_continuous -infile recording.wav 2> /dev/null

But it aborts before the complete audio file is transcribed and the default model has waay to few words to create a readable text from the audio.

I have compiled and tested the demos in sphinx4 source package but all the examples seem to have to few words and needs a model loke the voxforge one to be useful to me.

How can I set this up?

Answer 1

It's very simple to plug in Voxforge acoustic model. The main document covering the API is cmusphinx tutorial:

http://cmusphinx.sourceforge.net/wiki/tutorialsphinx4

It's recommended to read it before you start. Please also note that it is recommended to use En_US English Generic acoustic model, it is more accurate than Voxforge.

Step by step you need to do the following:

• Download voxforge model from sourceforge and unpack it to a folder
• Checkout sphinx4 from github and build it with gradle
• Run TranscriberDemo
• Go to sphinx4-samples/src/main/java/edu/cmu/sphinx/demo/transcriber folder, open Transcriber demo and edit the acoustic model path as below.
• Edit the location of the audio file in sources if you need another audio file
• Run demo again and enjoy

That would be it

   // Load model from the folder in your project
   configuration.setAcousticModelPath("file:voxforge-en-0.4/model_parameters/voxforge_en_sphinx.cd_cont_5000");