Masking by a Periodically Interrupted Noise

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Abstract
A scale of noise intermittency may be represented at one extreme by a continuous noninterrupted noise and, at the other extreme, by an interrupted noise with silent intervals between successive noise bursts. The differential characteristic for various conditions along this scale is the noise level in the interval between successive noise bursts (the inter-burst level). Effects of a wide range of periodically intermittent noise conditions upon the masked threshold of a tone and the intelligibility of speech were examined. The principal result of these tests is that the masked threshold associated with an intermittent noise can be closely described by 2 functions: (1) the masking produced by an interrupted noise with silent intervals between successive noise bursts, and, (2) the masking produced by a continuous uninterrupted noise at the inter-burst level.

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