Abstract
An investigation was conducted to determine the effects of vent diameter, stimulus characteristics, and adaptive release time on the real ear compression ratio (CR). Real ear input/output (I/O) functions generated in response to syllables and speech-shaped noise revealed that the real ear CR is often less than the nominal value measured in the coupler, but only for CRs greater than 2:1. Results were similar across all vents except IROS, a condition that resulted in much larger errors than smaller vents. Pooled across vents, CRs of individual phonemes were found to be associated with phoneme duration, crest factor, and the interval of time between phonemes. Results were also influenced by an adaptive release time, which may have affected the compression of vowels and consonants differently.
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