GN Otometrics A/S
25
CAPELLA Cochlear Emissions Analyzer
User Manual
Stimulus:
Acoustical Bandwidth
500 - 4000 Hz ± 5 dB @ 1000 Hz
Input Resolution
Measurement range:
Time domain: 1 µPa/div. to 1 Pa/div.
Freq. domain: -30 dB to 10 dB SPL
3.1.3
Spontaneous Otoacoustic Emissions (SOAE)
Input Sensitivity
0 - 70 dB SPL
Frequency Ranges
500-5000, 500-10,000 Hz
3.1.4
Echo-Screen
Sound stimulus level:
70 to 85 dB SPL, self-calibrating to ECV (Ear Canal Volume)
Stimulus rate:
40...100 Hz
Stimulus type:
Nonlinear click
Signal bandwidth:
1.4 to 4 kHz
Max. sound pressure:
Limited to 85 dB SPL
Probe:
Eartips from 4 to 10 mm dia.
Signal processing:
Binomial statistical analysis of TEOAE sweeps for signal to noise ra-
tio. 99% confidence-level analysis of a time window from 6 to 12 ms
after the stimulus, ranked in four quality buffers
Result display:
"Pass" or "Refer", based on the acquisition of four pos. and four neg.
peaks
Data display:
Elapsed time, no. of peaks, no. of sweeps in each buffer, noise, arti-
fact rate, stimulus stability, signal quality, no. of accepted sweeps,
no. of rejected sweeps, percentage of completed sweeps
Graphic display:
Pos. and neg. significance level as a function of time after stimulus
