Designing and development of voice to machine interfacing technique

In this paper, microcontroller based automatic door open system has been developed. The system is developed as speech recognition circuit where programmable voice is used as reference. Programmable means trained voice has been used for identification of authorized and unauthorized person. As software part, MATLAB GUI interface has been used to record authorized voice, and to synthesize the recorded voice with feature extraction such as power spectral density of peak frequency by FFT (Fast Fourier Transform). Then these features will be verified with every incoming voice. This voice activity detection (VAD) is designed and developed to divide the speech signal into speech segment and non-speech segments. As hardware part, ARDUINO microcontroller has been used to implement the circuitry for this well trained automatic security system. This system is with low cost and well-performed in less noisy environment. Accuracy has been obtained around 99%. This system can also be applicable for other controlled access services like voice based biometrics, database access services, voice based dialing, voice mail and remote access to the computers.