Question regarding target REIGs in openMHA

[shaikath]

NALRP.png (87.05 KiB) Viewed 21690 times

Hello, I was going to be doing some testing using the NAL-RP prescription rule with flat loss profiles of 20 dB and 40 dB across all frequency bands. When I load those specified audiograms, I see the curves in the above^ picture. Assuming I'm trying to measure insertion gains at 65 dB, would it be accurate to interpret that the red curves seem to indicate that for a 65 dB signal, there would only be attenuations applied across all the frequency bands? The red line seems to fall below 65 dB SPL. I'm a bit confused as to why the actual target REIGs specified wouldn't be above 65 dB SPL.

[shaikath]

Or is it the case that simply creating a fit with NALRP specified is not sufficient? Do we have to change the gains/maxgains for each of the frequency bands?

[tobiasherzke]

Your graphs for 20dB pantonal hearing loss show amplification for frequencies above 500Hz. Please refer to the openMHA Fitting GUI manual for an explanation of the display. I hope this helps, please ask follow-up questions here if anything remains unclear so that we can improve the documentation.

[shaikath]

Thanks for sharing the fitting manual. That was very helpful. One question I have is whether the matlab fitting tool has a tool for measuring the actual real-ear insertion gain values within each frequency band? I understand that the LTASS panels show the insertion gain targets but it would be really useful to have the functionality to display the actual real-ear levels within each narrow band somehow. Is this a current feature by chance?

[tobiasherzke]

No, this is not a feature of this GUI. In order to access all insertion gains, you would have to extract (with mha_get()) the gtdata matrix from the MHA dc plugin that you have just fitted.