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Monitor Function
The operator can listen to the signals transmitted to the patient either via the monitor-speakers built into
the unit or via a monitor-headset connected to the unit’s rear panel. The monitor is activated or deactivated
via the controls page, by selecting the MONITOR softkey (F4). The control page is accessed by pressing the
CONTROLS (14) key.
Speech Audiometry
Speech material threshold regulation
The test can be performed using speech material from the following sources:
A CD-player connected to the unit (EXT1 and EXT2 inputs); an operator microphone connected to the
appropriate connector on the unit’s rear panel, SD card storing speech material supplied with the unit and
connected into the appropriate slot on the unit’s rear panel (30).
For adjustment of the external signal levels (EXT1 and EXT2) coming either from the CD-player or from the
operator microphone: Connect the external signal source to the CD TAPE connectors on the rear panel (24).
From the test page, switch both channels (11) to ON.
Via the INPUT (9) keys, select EXT1 and EXT2.
Press the CONTROLS (14) key to access the controls page.
Proceed with playing the CD track with the calibration signal.
Using the adjustment knobs (4) for both channels, adjust the level of the two EXTERNAL GAIN bars until the
two bar graphs alongside the two adjustment bars, read 0 dB.
Press the SAVE (5) softkey to store the level then press GO BACK (5), to return to the test page.
Level adjustment of the speech material provided on the SD card does not require any further adjustments
by the operator. By the keys INPUT (9) and SIDE (8) of the two channels, it is possible to send the masking
noise and the speech material in the same ear in order to perform a Speech in Noise test.
Test conduction and percentage answers
Using the operator microphone or an external signal source (via MIKE or the EXT1 and 2 inputs), the
operator rst needs to set the number of words to be transmitted to the patient, by acting on left and right
(10) arrow keys. Once the phoneme has been conveyed to the patient, the correct reply shall be transmitted
to the program by pressing on the up (10) arrow key. The percentage is detected automatically. The relative
audiogram plotting is generated by pressing the STORE (17) key.
With integrated SD card speech material (SD CARD input), the available speech material play lists and
speech material genres are shown on display. Using the arrow keys (10) it is possible to select the speech
material genre (e.g. two-syllable words for Italian), the language and the list. To start the test, press the PLAY
(5) softkey. During the test, correct replies can be entered either using the arrow keys or by pressing on the
ENTER (5) softkey. If this last option is used, an indicator will also be displayed alongside the corresponding
word in the list being run. While the test is being run, it is also possible:
- to repeat transmission of a phoneme that has just been transmitted (via the REPEAT softkey)
–to go into test pause mode (via the PAUSE softkey),
–to change the time interval between phonemes (via the TIME+ and TIME– softkey)
–to interrupt the test by pressing on the STOP (5) softkey.
The phonemes conveyed to the patient shall be shown on display individually. It is also possible for the
operator to listen to them either via the monitor-headset or via the built-in monitor-speakers.
Pressing F2 softkey is possible to store the SRT value for the active output.
Auto-threshold Test (Hugson-Westlake Auto-threshold)
The automatic threshold test is started either by pressing on the START/STOP (16) key or by pressing on
the START (5) softkey. To interrupt the autothreshold test being run, either press on the START/STOP (16)
key or press on the STOP (5) softkey. Threshold readings for each frequency shall depend on the response
given by the patient via the patient response pushbutton that is connected via the connector (28) on the
unit’s back panel. The patient will have to keep the button pressed when he hears the stimulus and release
it when he no longer hears the stimulus.
Test ABLB (Alternated Binaural Loudness Balance or Fowler Test)
The test is carried out only using AC headsets alternating the same acoustic stimulus (only in pure tones)
between the two ears (right and left) ,with the possibility of varying independently the level of the stimulus
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