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Masking 2
Masking rules and procedure
| Question | Answer |
|---|---|
| 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
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