^SynOhrMultiSenseKNX-Eng-13.odt, 2014-05-06 Page 44 of 49
the table a corresponding list.
Background on
the Functioning
Keyword
Similarities
Important for a trouble-free operation in practice is, that the recognizer does not realize unasked
the keyword. Basically always confusions in the spoken word are possible, e.g. for ENERTEX
there is a great similarity to „A lot tax!“ or for the COMMANDO „Tornado“.The difference
between the word ENERTEX and „A lot tax!“ seems to be enormous for the user, but especially
because the human brain „knows“ , that only ENERTEX represents a valid activation word. The
brain finds easily the critical point „lot“ and „NER” and distinguishs the desired word.
Parameter Clarity
SynOhr MultiSense KNX has user-configurable specifications: The value for the clarity can be
changed or in the expert options of the parameter speech quality activation. If the value is raised
for clarity, the user needs to speak much more clearly, so that the recognizer accepts the
activation word. Here should be noted, that the clarity values always depend on the activation
word. The word ENERTEX can achieve mostly with level 3 a good robustness., however at level
7 the COMMAND is often better.
It should be noted, that then it will be more difficult for the user under circumstances to activate
the recognition, especially for longer distances or ambient noises. Compared with vowels are
e.g. sibilants 10 to 25 times weaker than in the speech signal. Therefore also the distance to the
speaker, besides noise like radio etc. plays a role for recognition.
Parameter Room
Size
Another parameter affects the robustness of the recognition: The parameter „Room Size“, which
basically corresponds to the microphone gain. If SynOhr MultiSense KNX is operated in a short
distance (1...4 m), but was configured on large room size so the confusion rate of the recognizer
can slightly increase. In unstable ambients the recognition should only be possible to activate via
keyword, if at least it is spoken with a significant volume. In this case the room size should not
be chosen too large. Additionally can be activated a pulse suppression with the experts setting
„Noise Level“. It is unfavorable in any case, if an activation of the keyword in a low voice is
possible in rooms with high level of interference noises or conversations.
Override
Important: Blue flashing of the ring means „overridden“. Then the recognizer is acoustically
overridden. If this is very often the case please reduce the room size.
Enertex
®
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