### ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

## 1aSC25. Quantitative measures of envelope cues in speech recognition.

**Johnny Saade
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*Dept. of Elec. Eng., Univ. of California, Los Angeles
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House Ear Inst., Los Angeles, CA 90057
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**Fan-Gang Zeng
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John J. Wygonski
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Robert V. Shannon
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Sigfrid D. Soli
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*House Ear Inst., Los Angeles, CA 90057
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**Abeer Alwan
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*Univ. of California, Los Angeles, CA
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A quantitative procedure is derived to evaluate the relative contribution
of envelope cues to speech recognition. Recognition data of 16 consonants in
the /aCa/ form were collected using signal-correlated noise stimuli in seven
normal-hearing listeners. Several distance measures were calculated directly
from duration and amplitude of the acoustic envelope. One amplitude distance
measure was the Euclidean distance which was computed from the squared
difference of the sample-by-sample amplitudes. The second measure was the
envelope difference index (EDI) [Fortune et al., Ear Hear. 15, 93--95 (1994)]
which was computed from the absolute value of the difference of the
sample-by-sample amplitudes. A multidimensional scaling analysis was used to
convert the perceptual confusion matrix into a distance matrix and to normalize
the different distance measures. Correlation coefficients were computed between
the different distance measures and the perceptual data. Preliminary analysis
of data from six stop consonants showed that the consonant duration alone is
sufficient to explain the perceptual data (r=0.92). Although Euclidean distance
conveyed less information (r=0.75) than duration, it was a better measure than
the EDI (r=0.31). Evaluation of these measures on the full 16 consonant set
will be discussed.