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Auditdata Measure

What is Audiometric Masking?

A narrow band noise is played through either supra aural or insert headphones. The level of noise presented through the headset is calculated by the Audiology Clinician according to BS EN ISO 389-4 or by using Masking Noise (M) + 10. M is calculated as being the lowest level of masking which the client can detect and is measured in dB.

Masking Screen

Why use Audiometric Masking?

Audiometric Masking is performed to provide accurate results of Pure Tone Audiometry by separating the ears acoustically; this means that the non-test ear is unable to assist the test ear. 

Audiometric masking

How to perform Audiometric Masking?

Audiometric Masking is performed to provide accurate results of Pure Tone Audiometry by separating the ears acoustically; this means that the non-test ear is unable to assist the test ear.

Across the world there are different rules for masking however some general rules of masking are:

  • Masking is needed where the difference between unmasked Air Conduction Thresholds is 40dB or more when using Supra Aural Headphones, or 55dB if using Insert Headphones. Reference found here.
  • Masking is needed where the difference between the unmasked Bone Conduction and Air Conduction thresholds of either ear is 10dB or more.
  • Masking will be needed where there is a Bone Conduction threshold of 40dB or more than that of the Air Conduction threshold, where Supra aural headphones have been used, or by 55dB where Insert Headphones have been used.

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