Hacked Gadgets Forum

December 28, 2006

Voice Recognition Security System

at 5:01 am. Filed under Complex Hacks, Cool Gadgets, Electronic Hacks

If you are ever thinking about making your own voice recognition system, this project would make a great starting point.

” Firstly, we looked at the speech recognition algorithm to understand the implementation. We then prepared the microphone circuit, and then proceeded to start sampling and generate the digital data for the speech. Once we have the data, we started writing the code based on Tor’s speech recognition algorithm. We also wrote the digital filters in assembly code to save the number of cycles necessary for the sampling rate of the speech, which is at 4K/second. Afterwards, we analyzed the output of the filters to recognize which word was spoken. Finally, we added an LCD for better user interface to signal if the password spoken is correct or not.

The project has not met our expectations fully, as we initially specified that the system would be able to recognize a sentence as a password. But we are more than happy that it is able to recognize a word as the password by more than 80%-90% of the time, depending on the choice of passwords. There is a training procedure that need to be implemented, which is an added feature to increase the accuracy of the security system. However, the system can still be used without training. In this case, there is a maximum of 5 words only.”