Determination of masking-level differences in a reverberant environment

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Abstract
A masking-level-difference (MLD) paradigm was used to measure release from masking in a reverberant environment in human subjects. The masking-level difference was specified in terms of the signal level in dB at threshold for an experimental condition, relative to the signal level at threshold for the reference condition where the maskee and masker were both binaurally in phase. Two types of masking situations were used: incoherent masking.sbd.a signal (pulsed tone or speech in this study) had to be detected in a noise background; and coherent masking.sbd.the signal and masker were derived from the same source. Band-limited noise and speech were used in the coherent masking experiments. For both masking conditions, the MLD was about 3 dB. Cross correlation of the late-echo structure of impulse responses taken at the left and right ears of a manikin showed that the reverberant sound field was uncorrelated between the 2 ears. This was consistent with a 3 dB MLD result.

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