Operation Manual MA 42
8100460 Rev.7 Ver.1
35
12/15
Speech-in-noise test, the QuickSIN
TM
, was developed to provide a quick
estimate of signal-to-noise ratio (SNR) loss. This test is incorporated into the
MA 42, with selection made in the speech testing screen under the Wave file
lists (11) or (15). The complete QuickSIN Speech-in-Noise Test manual,
version 1.3 is provided in Appendix B. MA 42 does not incorporate the entire
QuickSIN lists but provides Standard QuickSIN lists 1-12 (i.e. Track 3-14 from
the CD recording). Note: Pre-calibration of the QuickSIN lists was
implemented into the recording and installation of the Wave files on the MA
42. No input calibration is required.
6.2.7
Master Hearing Aid (MHA)
After you have completed the speech audiometry testing you may wish to
demonstrate to the patient the difference a hearing aid can make. Use the
MA 42 Master Hearing Aid (MHA) to adjust various frequency slopes for
speech signals.
The MHA feature utilizes input signals from the Live Voice (Mic), external
CD/MP3 player or Wave files. These signals are then filtered to simulate the
benefit of hearing aids in the case of a high frequency hearing loss. The level
of the low frequencies can be reduced by 6 dB, 12 dB, and 18 dB per octave.
Begin by selecting a signal source in the speech mode with the functional
selector button (11) or (15). Start the MHA function by pressing the Test
Selection button (13). Press the stimulus mode (11) or (15) indicator to
alternate between signal sources like the microphone or the CD. Change the
dB presentation levels with the level control dials (1). The influence of the
filters can be changed by using the Frequency Up (4) and Down (5) keys. The
MHA function can be performed using monaural or binaural presentations.
Figure 14 - Display Master Hearing Aid
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