4.27 effective masking level for speech. Sound pressure level of a specified masking noise that masks a speech signal to 50 percent probability of recognition. The hearing level reference of the masking signal is equal to that of a speech recognition...
4.26 effective masking level for pure tones. Sound pressure level of a band of noise whose geometric center frequency coincides with that of a specific pure tone that masks the pure tone to 50% probability of detection. The hearing level reference of the...
4.25 effective masking. Occurs when the masker is just strong enough to prevent a listener from hearing the test stimulus when stimulus and masking signals are presented simultaneously to the same...
4.24 deafness. Condition caused by a hearing loss which results in a person’s inability to use auditory information effectively for communication or other daily activities, even with...
4.23 damage risk criteria. For hearing, the level of sound exposure which a population may receive for a specified time with a specified risk of hearing loss. See also 4.32 and 4.45. Annotation Damage risk...
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