D-0123003-B 05/2019
Master Hearing Aid
Master Hearing Aid is an alternative to using a stock hearing aid to demonstrate the
benefits of amplification to an inexperienced user. The system applies the fitting rules by
default to the patient's audiogram and simulates a hearing aid. The patient listens to this
signal through the headphones. Options for editing the gain applied to the audiogram are
provided.
About the Master Hearing Aid Display
The Master Hearing Aid screen displays a graph with dB Gain on the vertical axis and
Frequency in Hz on the horizontal axis. The plot on the graph represents the gain applied
to the patient’s Audiogram. The NAL-RP is applied by default. A new rule can be selected
from the list on the right side of the display. A volume adjustment bar allows for manual
adjustment of the output level. The control panel on the right of the display provides
options for input signal source and the task icons for Normal and Simulate.
The Master Hearing Aid applies gain separately for each ear. If audiogram values are
entered for the left and right ear, the selected fitting rules will be applied to each ear
separately. Different rules may be entered for different ears (i.e. NAL-RP for left ear and
BERGER for right ear). If an audiogram is entered only for one ear, the gain will not be
adjusted for the opposite ear and the sound for that ear will be normal.
If Binaural mode is selected, the sound will be heard from both channels (left and right).
If Monaural mode is selected, the sound will be heard only from the channel
corresponding to the active ear when the channel for the opposite ear will be muted.
Input signal
Live voice (microphone) allows you to use the right probe mic for live speech input to
the headphones. The clinician or significant third party can speak into the microphone for
this activity. Note: there is a processing delay between the input and playback. Make sure
that the client cannot hear the voice directly but only through the headset. If this is not
possible, use the Recorder (describer below) to simulate speech input.
File allows the user to play sound files. The program supports MP3 and WAV files and
comes with a
preset MedRx Sounds Sensations set of files. After the option is activated, use the player
panel to control the playback.
CD allows the user to play music CDs. After the option is activated, use the player panel to
control the playback.
Record input mode allows the clinician or third party to record a sample of their speech
which can then be replayed for repeat comparisons under different amplification
conditions for the patient. Refer to the interactive Help system by pressing F1 or clicking
the Help icon to learn more about the recorder.
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