What is the type of masker noise presented by air conduction and bone conduction?

The type of masker noise presented by air conduction and bone conduction is narrow band noise. Narrow band noise is specifically designed to target certain frequencies. It is effective in masking the sounds that fall within a specific frequency range, which makes it suitable for audiometric testing and in various audiological contexts. This type of noise allows for a more controlled masking of the test sounds, facilitating accurate assessment of hearing thresholds.

Other types of noises, such as pink noise and white noise, have broader applications but are not as finely tuned for specific frequency masking needs in audiometry. Pink noise, for instance, has equal energy per octave, which makes it sound softer than white noise, while white noise contains all audible frequencies presented at equal intensity - neither serves the focused masking function as effectively as narrow band noise in the context of hearing tests. Broad band noise encompasses a larger range of frequencies and is typically used in a more general context rather than for targeted sound masking.