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논문 기본 정보

자료유형
학술저널
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저널정보
한국청각언어재활학회 Audiology and Speech Research Audiology and Speech Research 제7권 제1호
발행연도
2011.1
수록면
74 - 83 (10page)

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Filtered speech can cause significant speech-recognition difficulties in hearing–impaired and CAPD patients. This study measured recognition performance for low- and high-passed filtered monosyllables and sentences, to be included in assessing peripheral or central auditory function. Two lists of Korean monosyllables (H-lists and KS-MW-lists) were filtered at each of five low-pass cutoffs (500, 800, 1,200, 1,500, or 1,700 Hz) or each of five high-pass cutoffs (1,700, 2,100, 2,500, 3,000, or 4,000 Hz). The Korean Standard-Sentence Lists-Adult was filtered at each of seven low-pass cutoffs (250, 350, 500, 800, 1,200, 1,500, or 1,700 Hz) or each of six high-pass cutoffs (1,700, 2,100, 2,500, 3,000, 4,000, or 6,000 Hz). Word and sentence recognition tests were studied in 20 adults, ages of 20~27 (mean=22.7), having normal hearing sensitivity. The results showed: first, with filtered monosyllables, percent-correct recognition decreased significantly by lowering the cutoff frequency in low-pass conditions or raising the cutoff in high-pass conditions. There were no significant recognition-performance differences between H list and KS lists in both low- and high-pass conditions, except at 500 Hz and 800 Hz low-pass cutoffs conditions; the cross frequencies of H list and KS list were 1,531 Hz (78.95%) and 1,516 Hz (76.08%), respectively. Second, recognition of low-pass filtered sentences decreased significantly (from 100% to 6.00%) by lowering the cutoff from 1,200 Hz to 250 Hz. Recognition of high-pass filtered sentences decreased significantly (from 100% to 27.15%) by raising the cutoff from 2,500 Hz to 6,000 Hz. Third, comparing filtered-word to the filtered-sentence recognition performance, showed higher accuracy with sentences than with words, probably because of increased sentence redundancy. The results showed that frequency cutoff and type of speech material affect recognition of filtered speech. For words and sentences, these low- and high-pass cutoffs parameters could be relevant in the evaluation of peripheral and central auditory function.
#Cutoff frequency #High-pass filter #Low-pass filter #Speech recognition #Speech redundancy.

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참고문헌 (38)

참고문헌 신청
Schum DJ / 1991 / Actual and predicted word recognition performance of elderly hearing impaired listeners / J Speech Hear Res 34(3):636~642 google schola Scott T / 2001 / Interactive effects of low-pass filtering and Masking noise on word recognition / J Am Acad Audiol 1(9):437~444 google schola Stuart A / 1998 / Recognition of temporally distorted words by listeners with and without a simulated hearing loss / J Am Acad Audiol 9(3):199~208 google schola Studebaker GA / 1987 / A frequency importance function for continuous discourse / J Acoust Soc Am 81(4):1130~1138 google schola Studebaker GA / 1993 / Frequency-importance and transfer functions for the Auditec of St. Louis recordings of the NU-6 word test / J Speech Hear Res 36(4):799~807 google schola

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