24
GN Otometrics A/S
User Manual
CAPELLA Cochlear Emissions Analyzer
3.1
Technical specifications
3.1.1
Distortion-Product Otoacoustic Emissions (DPOAE)
Stimulus
2 sinus stimulus channels
Geometric Center Frequencies
0.5, 0.75, 1.0, 1.5, 2.0, 3.0, 4.0, 6.0, 8.0 kHz
Stimulus Level Range
0 - 70 dB SPL
Stimulus 3rd order Intermodulation< -80 dB
Input Sensitivity For Stimulus
≥
50 dB SPL: 80 to -30 dB SPL
< 50 dB SPL: 60 to -50 dB SPL
PC Readout:
800 point FFT analysis
Fsample
Fmax
Resolution
26.04 kHz
10 kHz
13 Hz
13.02 kHz
5 kHz
6 Hz
6.51 kHz
2.5 kHz
3 Hz
Frequency Response Accuracy:
Microphone
± 3 dB from 500 to 4000 Hz
± 6 dB from 4000 to 9000 Hz
Sound Level
711 Coupler Reference (volume compensated)
± 4 dB from 500 to 4000 Hz
± 7 dB from 4000 to 9000 Hz
In Situ Sound Level Adjustment
± 4.5 dB from 500 to 4000 Hz
3.1.2
Transiently Evoked Otoacoustic Emissions (TEOAE)
Stimulus
Non-linear:
3 clicks of the same polarity and 1 click of opposite polarity, at 3
times the amplitude of the 1st click. Pulse width 40, 80, 120 µsec.
Stimulus Level Range
30 - 80 dB p.e. SPL approx. -30 to 60 dB nHL
Linear:
Unipolar click. Pulse width 40, 80, 120 µsec.
Stimulus Level Range
30 - 80 dB p.e. SPL approx. -30 to 60 dB nHL
Level Accuracy
± 4 dB
