GN Otometrics A/S
7
CAPELLA Cochlear Emissions Analyzer
User Manual
sis to measure emissions whose sound pressure level is below that
of extraneous and body sounds and (where applicable) the evoking
stimuli. Echo-Screen uses statistical analysis to perform rapid meas-
urement and classification of Transient Otoacoustic Emissions.
Capella
also incorporates a Tympanometry module to diagnose or
eliminate middle ear disorders as a cause of hearing loss or potential
hearing problems identified by OAE measurement. This module
records the changes in the immittance of the middle ear associated
with changing static pressure in the ear canal. This pressure is swept
through a predetermined range by means of a digitally driven
pump.
The measurement techniques employed in
Capella
have several dis-
tinct advantages over more traditional audiologic tests:
1.
Objectivity
No behavioural response is required from the patient.
2.
Time-efficiency
Some tests can be accomplished in less than a minute for both
ears.
3.
Non-invasiveness
No electrodes are required. No discomfort to the patient. Sig-
nal delivery and OAE response measurement are achieved
using a small probe held in place by a soft, disposable eartip.
4.
Sensitivity to cochlear function
Useful in the differential diagnosis of cochlear and retrococh-
