Speech Recognition

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Revision as of 18:13, 8 February 2011 by Verbeek (talk | contribs) (Setting up Speech Recognition)

Speech Recognition on Robotino

Robotino can now comprehend basic human speech commands. Robotino uses the open source speech recognition engine called Julius.

Setting up Speech Recognition

Setting up speech recognition is done in two parts. The first part involves training of the speech data and creation of the acoustic model and the second involves the actual execution of the speech recognition engine with the created acoustic model.

Creating an Acoustic Model

The HTK toolkit (version 3.4) shall be used to create an acoustic model. Please follow the following steps.

Step 1

You will need to register with HTK before you can download it. Please do so.

Step 2

Download the sources for HTK toolkit 3.4 from here.

Step 3

  • Move to your home directory
 cd ~ 
  • Create a directory called bin
 mkdir bin 
  • Unpack the downloaded HTK toolkit sources in a folder called htk-3.4 in the bin directory. The bin directory should look as follows
 
ls bin 
htk-3.4 
  • If you have a newer version of the gcc compiler (version 4 or above), you will need to install gcc version 3.4 so that HTK will compile properly. Use the following gcc's version command to see which version is installed on your system
gcc -v
  • If your gcc version is 4 and above, follow the listed commands to install gcc 3.4
 
sudo apt-get install gcc-3.4 
sudo rm /usr/bin/gcc
sudo ln -s /usr/bin/gcc-3.4 /usr/bin/gcc 
  • Install the external dependencies as follows
sudo apt-get install libx11-dev libesd0-dev libasound2-dev libzip1 flex
  • Now move to the htk-3.4 dir and configure htk as follows. Note change %yourusername% from the command to your user name.
cd htk-3.4
./configure --prefix=/home/%yourusername%/bin/htk-3.4
  • Now run make all and make install. This should install the created binaries to the folder /home/yourusername/bin/htk-3.4/bin .
make all
make install
  • Change directory back to home and create a folder called voxforge and then a folder called HTK_scripts in the voxforge folder.
cd ~
mkdir voxforge
cd voxforge
mkdir HTK_scripts
cd HTK_scripts