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SECTION ONE | CLINICAL GUIDANCE

The effects of Beam were evaluated in a double-blind trial with ﬁve adult

Nucleus

CI users

Subjects were tested with their standard program and

were then ﬁtted with Beam. Testing with Beam was carried out after a two-

week trial period. Speech Reception Threshold (SRT) with sentences and the

percentage correct phoneme scores for Consonant-Vowel-Consonant (CVC)

words were measured in quiet and noise at different signal-to-noise ratios.

The results are shown in quiet (quiet), speech weighted noise at 90° (spw 90),

multi-talker babble at 90° (babble 90), speech weighted noise from three

directions 90°, 180° and 270° (spw 3n), and multi-talker babble from three

directions 90°, 180° and 270° (babble 3n). Beam showed signiﬁcant beneﬁts

for listening to speech in competing noise. As shown in Figure 15, the group

showed an average improvement of 5 – 16 dB in SRT in noise when wearing

Beam compared to their standard program. Percentage correct phoneme

scores improved from 10 – 41 percentage points.

Focus with the CP810 Sound Processor

The CP810 utilizes two programmable omni-directional microphones, with

long ﬁlters and individual customized calibration of up to 1 dB precision, as well

as proprietary DSP technology that combines them into selectable response

patterns. In addition to providing greater noise cancellation from the rear and

sides than the Freedom processor, CP810 Focus more reliably preserves sound

from in front.

A comparison of Focus with the Freedom sound processor and the CP810

sound processor was conducted as part of the Nucleus 5 validation

. Speech-

in-noise testing was conducted with 19 Australian subjects using a spatially

separated noise setup, in which four talker babble was delivered from speakers

positioned at left, right, and behind the subject (N 90, 180, 270). The signal-to-

noise ratio was optimized for each participant to avoid ﬂoor and ceiling effects.

Figure 15:

Improvement of

Speech Reception

Threshold (SRT) with

Beam in different

noise scenarios

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