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Masking 2

Masking rules and procedure

What is the ratio between increase in masking noise and elevation of threshold? 1:1
What type of masking noise is used? Narrowband noise
Interaural attenuation using supraural headphone 40dB
Interaural attenuation using inserts 55dB
Interaural attenuation using a bone conductor 0dB
Describe M+10 method measure the lowest level of masking noise that can be detected (10 down, 5 up) then start at this level + 10dB
Rule One states that... Masking is required at and frequency where there is a difference of 40dB with headphones and 55dB with inserts between the ears
Rule Two states that... Masking is needed at and frequency where the difference between not-masked air and bone conduction is greater than 10dB
If the threshold does not change or changes by 5dB... Swap the TE and NTE
When does Rule Three apply? When Rule One has not been applied
Rule Three states that Masking is required at any frequency where the difference between the most acute not masked bone conduction and the least acute not masked air conduction is greater than 40dB with headphones and 55dB with inserts
Why is Rule Three needed?? Where a conductive loss in the better ear places the unmasked air conduction results close together.
Instructions for masking Hear the tones again, do same as before, may hear a rushing noise - ignore and press for tones, let me know if it gets too loud
First thing to do when masking Re-establish the unmasked threshold and re-establish with effective masking
Response Increase masking by 10dB and represent test tone
No response Increase tone by 5dB and represent
No response Increase tone by 5dB and represent
Response Increase masking by 10dB
Three responses Mark new masked threshold
What other configuration of plateau is allowed? 5dB difference
Above what dB should you take care due to ULL's? Masking - 80dB Tone - 100dB
The Occlusion effect causes... Pronouncement of low thresholds
Where should two arrows be made on the masking chart? x axis - initial masking level as shown by bc threshold of NTE y axis - initial tonal level as shown by unmasked pure tone threshold of TE
What should you ensure you do after finishing each masking threshold? Turn down the masking and mark the new threshold on the audiogram
Created by: Youworktoohard