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3.
An examination can be started with a test of the voice frequencies and register
functions of the patient. This is carried out without touching the Pedal by letting the
patient utter the desired sustained vowels while the measured frequencies are dis-
olaved (see Fia. 3.10.).
Voice Frequency
I
Hz
Trigger Phase,
0
Fig. 3.10.
Although the automatic tracking filter and other circuitry are not intended for measure-
ment of the speaking voice, some users do get useful information by letting the patient
speak freely, while observing the rapidly changing frequency read-out of the Display.
4.
A normal examination sequence may be carried out as described in the following.
(a) A Larynx Mirror is fitted into the Light-probe Mirror-holder.
(b) The Mirror may then be heated in the normal way over an alcohol flame without
special consideration for the light probe.
Note: Heating over the flame for more than a few seconds at a time may, however,
cause the polished end of the light probe to be less light transmitting. If the light trans-
mission is felt to be reduced the two ends should be cleaned with an alcohol wetted
cloth. In case where the polished finish is degraded a repolishing could be carried out.
(c) The Mirror is placed in position for viewing the larynx while the pedal is pressed
to its lowest position thereby switching the fixed Halogen Light on for orienta-
tion. Using this light the vocal cords and other parts of the larynx may be
examined. The instrument display is shown in Fig. 3.11.
Voice Frequency, Hz
Trigger Phase,
0
Fig. 3.11.
13
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