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audiology - masking
puretone and speech masking
| Question | Answer | example |
|---|---|---|
| why do we mask | sounds can cross over to the other ear so we want to make sure the the ear we're testing is the one responding | used for bone and air conduction |
| interaural attenuation | How much sound is lost as the sound travels across the skull between ears. works for bone and air conduction testing | amount varies with the frequency of the tone. low frequency tones loose less energy traveling across the skull than high frequency tones. |
| how much sound is lost in interaural attenuation | At low frequencies (250Hz) there is 0dB lost. At 4KHz you lose 15dB from ear to ear. | |
| what is the avg. amount of sound lost via bone conduction | 5-10dB | |
| what is the avg. amount of sound lost via air conduction | 45dB | energy lost between the two ears |
| Masking rule #1 | if there is asymmetry of 15dB or more by air conduction TH in the two ears, mask the better ear when you test the poorer ear by bone conduction | |
| masking rule #2 | mask whenever bone conduction is better than air conduction thresholds | |
| masking rule #3 | if air conduction threshold in 1 ear is 45dB or more worse than the AC thresholds in the other ear, you need to mask the better ear and retest the poorer ear by air conduction | |
| masking rule #4 | when air conduction is the same in both ears and bone testing is the same, you don't need to mask | |
| what is masking | when we hear two sounds a the same time and one prevents you from hearing the other one | music at a party drowns out someone talking to us |
Created by:
schaunag