The function of this speech recognition security system is to have a system that will only unlock upon recognizing a voice password spoken by the administrator or password holder.
The function of this speech recognition security system is to have a system that will only unlock upon recognizing a voice password spoken by the administrator or password holder. Firstly, look at the speech recognition algorithm to understand the implementation. Prepare the microphone circuit, and then proceed to start sampling and generate the digital data for the speech. Once you have the data, you start with writing the code based on Tor's speech recognition algorithm. Write 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, analyze the output of the filters to recognize which word was spoken. Finally, you can add an LCD for better user interface to show if the password spoken is correct or not. The design of entire circuit is very simple. The microphone circuit goes to the ADC of the MCU. The digitized sampling of the word is passed through the digital filters (flash programmed onto the MCU). The analysis is done on the MCU as well. Once that is done, the LCD which is connected to the MCU displays if the word spoken matches the password or not.
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