Audio Traveler AA222, Operation Manuals, Page: 111 / 141

AA222 Operation Manual Page 111
Probe Tip:
The upper part of the probe tip on which the ear tip, a cuff
which is used to seal the probe into the external auditory canal,
is placed.
Reflex Activated Acoustic Immittance:
The acoustic immittance measured with the middle ear muscle
reflex activated by a defined stimulus at a specified air
pressure and with a constant tonus of the middle ear muscle.
Static Acoustic Immittance:
1) The acoustic immittance as observed at a constant
specified air pressure and with a constant tonus of the
middle ear muscles.
2) The volume of air that is equivalent in acoustic
compliance to that of the middle ear. Measured in
millilitres or cm
2
.
Stimulus Ear:
The ear to which the reflex activating stimulus is presented in
order to elicit a middle ear muscle reflex.
Note: If a bone
vibrator or a loudspeaker is used to deliver an acoustic reflex it
may not be possible to define the stimulus ear.
Toynbee Test:
Test designed to determine the function of the Eustachian tube
in ears with perforated eardrums.
Toynbee's Manoeuvre:
See Valsalvation.
Tympanogram:
A chart of the results of tympanometry - compliance
measurements at the eardrum.
Tympanometry:
The measurement of the ability of the eardrum and ossicular
chain to transmit sound pressure waves. An intact eardrum is
subjected to air pressure changes to determine its stiffness
(impedance) and compliance (admittance).