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EasyVR 3
User Manual (1.0.11)
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 5 – Interface for changing recognition settings
The first two parameters (“
Level
” and “
Knob
”) 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).
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
good, but then you may also lose a few correct results. So, in the end, you need to find the best compromise.
The last parameter affect the internal microphone pre-amplifier and AGC (Automatic Gain Control) stages
and is an indication of the expected operating distance of
the microphone from the speaker’s mouth.
Note:
The EasyVR module is optimized for the default distance setting “
Arms Length
”.
Any other settings may require hardware modifications to the onboard gain resistor.
To change the recognition settings of the
currently connected EasyVR device press the “
Apply
” button. The
window is non-modal, so you can test the effects of your changes while leaving it open.
The “
Save
” button makes the EasyVR Commander remember your settings and automatically apply them to
every connected device. The module itself does not store any option.