Voice command recognition (also referred to as "automated voice command recognition", "computer voice recognition", or in a slightly altered form "voice recognition") is the process of converting audio signals specific to the human voice into a sequence of words, using an algorithm implemented as a computer program. Next we will use the abbreviation VCR to refer to the current title.
In June 2006, I've developed such a computer software, for my master dissertation thesis.
In the first step it receives the human voice from a microphone. Next it applies a Fast Fourier Transformation on the data set recorded with the microphone. The result is that for every sound it records, it processes a sequence of numbers based on the distribution of the frequencies.
You can see this as a number based descriptor, for various audio signals.
These sequences can then be applied to a neural network for the purpose of recognizing them.
This is only the main idea, more work has been actually done to cut representative voice signals out of the continuous stream coming from the microphone. The processor cost is quite high in this phase and it needs improvement, but overall the algorithm works well.
Here is a short video with me showing this software:
Hope you like it