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CLINICAL GUIDANCE | SECTION ONE

Group mean results for CUNY sentences at 65dB SPL are shown in Figure 16,

and indicate a statistically signiﬁcant mean improvement of 12 percentage

points with CP810 (67%) over the Freedom sound processor (55%) when Focus

(using Beam) was enabled.

References

1. Van den Berghe, J., Wouters, J. An adaptive noise canceller for hearing aids using two

nearby microphones. (1998) Journal of the Acoustical Society of America 103,

3621-3626.

2. Wouters, J., Van den Berghe, J. Speech recognition in noise for cochlear implantees with a

two-microphone monaural adaptive noise reduction system. (2001). Ear and Hearing 22,

420-430.

3. Maj, J-B., Wouters, J., Moonen, M. Noise reduction results of an adaptive ﬁltering

technique for dual-microphone behind-the-ear hearing aids. (2004) Ear and Hearing,

25 (3), 215-229.

4.Spriet, A., Duen, L.V., Eftaxiadis, K., Laneau, J., Moonen, M., Dijk, B.V., Wieringen, A.V.,

Wouters, J. (2007). Speech understanding in background noise with the two-microphone

adaptive beamformer Beam in the Nucleus Freedom cochlear implant system. Ear &

Hearing 28, 62-72.

5. CP810/CR110 Validation, Cochlear internal data Aug 2009.

1.12.4 Zoom

Zoom is only available with the CP810 sound processor, which has two omni-

directional microphones. Zoom has a directional pattern that is ﬁxed. It

does not change over time. The directional pattern of zoom is optimized so

maximum attenuation is achieved if noise is present from all directions at the

same time. It is not possible to conﬁgure the algorithm to cancel all directions

Figure 16 :

Improvement of

speech perception

scores with CP810

Focus compared

with Freedom

Focus in spatially

separated noise

Nucleus Freedom vs Nucleus CP810

SmartSound 2 Focus Program (n=19)

100

S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 Average

Freedom

CP810

Individual subjects p<0.001

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 77 78

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