Cochlear SPrint Sound Processor Informacje Techniczne Strona 47
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CLINICAL GUIDANCE | SECTION ONE
45
References
1. CP810/CR110 Validation, Cochlear internal data Aug 2009.
1.12.5 Autosensitivity
™
(ASC)
The function of the Autosensitivity control (ASC) is to automatically adjust the
microphone sensitivity based on the noise floor of the incoming acoustic signal.
If the noise floor is above a programmable breakpoint, it is likely that the gain
(sensitivity) is too high for that situation. In this case the ASC gradually reduces
the sensitivity. If the noise floor is below the breakpoint the gain is gradually
increased back to the manual setting. When using ASC, the microphone
sensitivity is automatically adjusted based on the noise floor of the surrounding
environment. The noise floor is the level to which sound decreases during breaks
in speech, also known as troughs. The ASC adjusts the microphone sensitivity
dynamically, and when the CP810/Freedom
™
ASC is set to default, it begins
to reduce the sensitivity when the measured noise floor in the acoustic signal
reaches 57 dB SPL. The overall perceptual effect of the ASC is a reduction in the
loudness of background noise. The programmable breakpoint is referred to as the
‘Auto-sensitivity Breakpoint’ and is by default set to 57 dB SPL for the CP810/
Freedom. This means that the autosensitivity function is activated (i.e. will start
turning down the sensitivity, once the background noise reaches 57 dB SPL. The
time taken for the ASC to adapt is in the order of seconds.
Figure 18:
Improvement of
speech perception
scores in noise with
CP810 using Zoom
compared with
CP810 and Freedom
using standard
microphone
directionality (no
Zoom).
0
20
40
60
80
100
Average
Freedom No Zoom
CP810 No Zoom
CP810 Zoom
*
*p<0.001
Testing in noise with zoom (n=15)
CUNY % 65 dB SPL - (S0, N90, 180, 270)
Percent correct
100
80
60
40
20
0
Freedom No Zoom
Average
CP810 No Zoom CP810 Zoom
Figure 2 Bars represent individual subject performance with each bar representing the average of eight lists measured over two sessions. The last three bars on the right
represent averages of all subjects’ performance, with error bars plotting the standard error of the mean. The asterisk indicates a statistically significant difference.
*p<0.001
*
- Cochlear 1
- Getting started 5
- T-level Assessment Procedures 6
- C-level Assessment Procedures 7
- 1.1.1 Behavioural Procedures 9
- Figure 2 : Loudness 18
- Base Level = 4 18
- Q varies 18
- 1.5 STIMULATION MODES 19
- Figure 3: Bipolar 20
- 1.6 TELEMETRY MEASUREMENTS 22
- and N24 series Cochlear 23
- Implant Systems 23
- 1.7 VOLTAGE COMPLIANCE 23
- 1.7.1 CI500 series, Freedom 23
- 1.7.2 Nucleus 24
- 24 System 24
- 1.7.3 Nucleus 25
- 22 System 25
- 1.8 POWER OPTIMIZATION 25
- 1.9 SOUND CODING STRATEGIES 29
- 1.9.1 ACE 30
- /ACE (RE) 30
- 1.9.2 SPEAK 31
- 1.9.3 CIS/CIS (RE) 33
- 1.11.1 Microphone Sensitivity 36
- 1.11.2 Volume Setting 37
- 1.12 NUCLEUS 38
- SMARTSOUND 38
- 1.12.1 ADRO 38
- 1.12.2 Whisper 39
- Whisper boosts soft 40
- 1.12.3 Focus (using Beam 41
- Figure 13 : A block 42
- 1.12.4 Zoom 45
- CP810 Zoom 46
- Freedom Dir / 46
- CP810 Standard 46
- (without zoom) 46
- Processor 46
- 1.12.5 Autosensitivity 47
- 1.13 SMARTSOUND 48
- ENVIRONMENTS 48
- Environment Options 49
- EVERYDAY 49
- 1.14 OBJECTIVE MEASUREMENTS 51
- 1.15 GUIDANCE FOR FM FITTINGS 53
- 1.15.1 CP810 Sound Processors 53
- SECTION 2: PROGRAMMING 57
- RECOMMENDATIONS FOR 57
- SPECIALTY DEVICES 57
- Figure 2: 58
- Descriptive 58
- Nucleus 24 ABI 58
- 2.1.1.2 Programming the ABI 59
- Pitch magnitude 1 – 100 60
- Loudness 1 – 10 60
- Figure 8 : T-levels 66
- 2.1.1.3 Managing Side Effects 67
- 2.1.1.4 Fine Tuning the ABI 68
- Figure 9 : Nucleus 70
- ABI 24M pitch 70
- 2.1.1.6 Rehabilitation 71
- 2.1.1.7 ABI Worksheets 72
- 2.1.2 THE NUCLEUS 74
- 24 DOUBLE ARRAY 74
- CLINICAL GUIDANCE 77
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