Cochlear Nucleus CR110 Manual de usuario descargar pdf (Pagina 12)

12 Cochlear Update | FM Solutions

Sensitivity adjustments on the CP810 Sound Processor act on the

combined signal. This differs from Freedom

™

, where sensitivity acts only

on the sound processor’s microphone signal, when using an accessory

input such as an ear-level FM receiver. The advantage of having sensitivity

operate on the combined signal is that it controls the amount of

compression applied to the speaker’s voice. Reduced compression means a

clearer sound and better understanding in noise.

Decreasing the sensitivity on the CP810 Sound Processor can reduce the

effect of background noise (such as ‘telecoil hum’ that may be picked up

when using a neckloop receiver). Background noise can occur in some

environments where the lighting and/or computers create a magnetic ﬁeld

that interacts with the telecoil.

Note:

Autosensitivity

is automatically applied to the microphone prior to

mixing, and to the mixed signals. This means that the user typically won’t

need to adjust the mixing ratio if there is additional background noise.

While Freedom users may be accustomed to using sensitivity to adjust the

loudness of the microphone input (effectively changing the mixing ratio),

the appropriate technique for the CP810 Sound Processor is to use the

mixing ratio on the CR110 Remote Assistant to adjust the loudness of the

sound processor’s microphone input, relative to the FM signal. The mixing

ratio can only be changed when the remote assistant is in ‘advanced’

mode. If the remote assistant is in ‘simple’ mode, the mixing ratio is ﬁxed

to the value programmed by the clinician when using the Custom Sound

software. The default mixing ratio is 1:1 which means the microphone

input is not attenuated relative to the FM input; a 2:1 and 3:1 mixing ratio

means the microphone input is reduced by 6dB and 9.5dB respectively.

4. Adjusting sensitivity and mixing levels

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Cochlear Nucleus CR110 Manual de usuario Pagina 12