Now that the system can both hear and speak, you'll want to provide the capability to respond to your speech and execute some commands based on the speech input. Next, you're going to configure the system to respond to simple commands.

In order to respond, we're going to edit the continuous.c code in the /home/pi/pocketsphinx-0.8/src/programs directory. We could create our own C file, but this file is already set up in the makefile system and is an excellent starting spot. You can save a copy of the current file in continuous.c.old so that you can always get back to the starting program, if required. Then, you will need to edit the continuous.c file. It is very long and a bit complicated, but you are specifically looking for the section in the code, which is shown in the following screenshot. Look for the comment line /* Exit if the first word spoken was GOODBYE */:

In this section of the code, the word has already been decoded and is held in the...