Master Hearing Aid (Mha) - Interacoustics Affinity 2.0 Additional Information

7) Do a masked threshold search. Typically, the masked threshold f or the SoNo condition will be equal to
the noise level. When you have established a threshold, click in the Stimuli area f or Store or press S
on the PC keyboard. Once the SoNo condition has been stored, the cursor will automatically jump to
the SπNo condition., in which the signal is out of phase and the noise is still in phase. Note that
f requency adjustments also can be perf ormed manually (see illustration)
8) Leaving the intensity of the noise at the same level, perf orm a threshold again, press Store, and the
cursor will switch to SoNπ. Where the signal is in phase and the noise in reversed phase.
9) Establish the threshold once more.
10) Press STOP to end the test.
11) The MLD will be the dif ference between the threshold of the homophobic condition (SoNo) and the
threshold of one of the antiphasic conditions (SoNπ or SπNo)
12) Save the MLD test by clicking Save
Note: In the setup f or MLD (see section 1.7.2.4) you can choose whether you would like MLD to be
calculated using SoNo minus SoNπ or SoNo minus SπNo.
1.7.7

Master hearing aid (MHA)

MHA is a hearing aid f itting procedure consisting of three hearing aid simulated high pass f ilters of -6 dB, -12
dB, -18 dB per octave and a HFE f ilter (High Frequency Emphasis) equivalent to -24 dB per octave through
the audiometric headphones. This gives a rough sense of the benef its of a hearing aid and what could
eventually be gained by getting properly f itted hearing aids. The f ilters can be activated individually on both
channels enabling the audiometer to serve as a 2-channel master hearing aid.
Required items:
The Af f inity hardware
• 2.0
• Licensed AC440 Audiometry module within your Af f inity
Headphones or insert phones
•
A microphone, CD player
•
Test procedure:
When having perf ormed the hearing assessment you may want to start discussing a possible hearing aid
solution. However, there is no guarantee that the patient is positive towards such a solution. He/she might
not even have acknowledged their hearing impairment and may theref ore not be motivated or prepared f or
this prospect. In this situation MHA may be usef ul.
9
MHA requires an additional software license
10
MHA using a CD player is only available on the Affinity
D-0004576-Q – 2022/05
Affinity/Equinox2.0 – Additional Information
9
10 or wave f iles
2.0
/Equinox
2.0 hardware with MHA f unctionality
2.0
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