Setting FM volume
33
OptiVoice is a 3-position switch that
automatically adjusts the sound quality
of the primary speaker’s voice. It allows
teachers to shape the sound of their voice
and helps to ensure maxium speech clar-
ity in low, medium and high noise levels.
Using Your System (cont’d)
10 20 30 50 100 200 500 1k 2k 5k 10k 20k
35
30
25
20
15
10
5
0
-5
-10
-15
-20
frequency (Hz)
dBv range
OptiVoice Settings and Speech Intelligibility
Critical speech intelligibility range (primarily consonants)
Lower frequencies provide warmth and personality but
can mask the higher frequencies critical to intelligibility
Contains little useful speech information
A
B
x
low position for
natural voice in
low noise levels
high position for
maximum intelligibility
in noisy conditions
medium position for
moderate noise levels
x
A B
x
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