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Speech reception thresholds were measured for a voice against two different maskers: Either two concurrent voices with the same fundamental frequency (0) or a harmonic complex with the same long-term excitation pattern and broadband temporal envelope as the masking sentences (speech-modulated buzz). All sources had steady 0s. A difference in 0 of 2 or 8 semitones provided a 5-dB benefit for buzz maskers, whereas it provided a 3- and 8-dB benefit, respectively, for masking sentences. Whether intelligibility of a voice increases abruptly with small Δ0s or gradually toward larger Δ0s seems to depend on the nature of the masker.


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