BitVoicer is a voice recognition program that can be used for developing microcontroller applications. It can process audio captured by the microphone installed on the computer or by a microphone wired to the microcontroller. The program makes it easy for a user to design different voice commands.
The communication channel between the microcontroller and PC should either be serial or TCP/IP for the program to work.
The audio processing and detection is done by the program using the computer, and not the microcontroller. A programmer should write separate program for the microcontroller to send/receive the data to/from the computer.