User Manual

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68 EasyVR 3 User Manual (1.0.14)
Note: If you want to re-train a command you need to erase the previous training first.
Note: "Vocal passwords" (Group 16) are much more sensitive to environment noise and
distance from the microphone: be sure to train and to verify the password in similar
conditions.
Recognition Settings
The module comes programmed with some default settings that can affect voice recognition. These
parameters can be altered in those case where the default values do not offer the best performance.
Figure 7 – Interface for changing recognition settings
The “Level” and “Knob” parameters affect the way recognition results are evaluated and reported, each
one for a different kind of voice recognition algorithm (Speaker Dependent/Verification and Speaker
Independent, respectively).
Both these values are used for a sort of acceptance threshold: each word or command recognized is
assigned a score by the algorithm, which is compared to the threshold.
In some situations the algorithm may flag a correct result as an error or a low confidence result. In those
cases you may try to lower the threshold and allow more results to be reported as correct. The drawback
is that even words that were correctly refused before now might also be accepted.
The vice-versa is also true: you can increase the threshold to avoid some incorrect words to be reported as