Threshold Values
Armelle Reca Remedio
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To distinguish the commands, threshold values are used. The threshold is the minimum value that can be reached per command. The process of obtaining the values is by selection. The person with a relatively stable voice is set as the basis for the threshold.
The advantage of the program is that of its simplicity. But since speech recognition is obviously very complex, the approach is limited. A specific speech pattern of a person and a set of specific spectra are used thus limiting the voice recognition to certain people who can reach the threshold values.
A problem will also occur if the person is not feeling well especially if sick since the equilibrium of the person is altered. Voice change also depending on the time of day thus making the recognition difficult to obtain.
For the Modem Connection
In the hardware part of the project, the commands (go, back, left, right, and stop) are connected to the parallel port of the CPU. By accessing the specific pins in the ports using C programming (outport and inport functions of the language), the status of the voice-controlled-remote-car can be send via a modem.
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