Abstract
All known frequency weighting systems for evaluating the effects of noise on speech discrimination will be reviewed and evaluated. These will include the articulation index (AI); the speech interference level (SIL); speech, noise, and alternate noise contours (SC, NC, NCA); the speech transmission index (STI) and modulation transfer function (MTF). Also there will be a discussion of the problems associated with measuring speech level (vocal effort) and with measuring those aspects of noise that affect talking and/or listening levels and the discriminability of spoken language. It has been found that the equivalent noise level (Leq) measured in dB(A) is a good measure of the effects of time varying noise on speech intelligibility (discrimination). Therefore it will be suggested that the A‐weighted level of noise, which is not the best speech interference measure for steady‐state wideband noises, may be the best simple comprehensive measure of the speech interfering aspects of noise.
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