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How the circuit works
Before we can get into the nuts and bolts of how the interface circuit functions, we must look at the binary information output by the speech recognition circuit. The output of the speech recognition circuit consists of two 4bit binarycoded decimal (BCD) numbers. This binary (BCD) information is shown on the speech circuit’s two-digit digital display. Whenever a word is detected, the circuit uses the digital display to output the word number it has recognized, or else it outputs its unrecognized/error code. If the word detected is not recognized, the circuit will display one of the following error codes: Our interface design incorporates a PIC microcontroller. A preprogrammed microcontroller’s (16F84) first job is to determine if a…















