A new technique has been developed for precisely quantifying the temporal contrasts that exist between two sound samples. This technique is based on envelope subtraction, and generates an Envelope Difference Index that may be used t o help clariQ whether alteration of the natural speech envelope via amplification improves or degrades speech intelligibility. The Envelope Difference Index method may also be used t o assess hearing aid saturation, and may have other applications as well. The technique is applicable whenever a precise quantifwation of the difference between two temporal envelopes is required, regardless of stimulus duration. (Ear & Hearing 1994;15:93-99)

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