期刊
INTERNATIONAL JOURNAL OF AUDIOLOGY
卷 48, 期 6, 页码 334-345出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14992020802644889
关键词
Consonant identification; Transposition; Band-importance function
资金
- Medical Research Council [G0701870] Funding Source: Medline
- RNID [G18] Funding Source: Medline
- MRC [G0701870] Funding Source: UKRI
Listeners with high-frequency dead regions (DRs) benefit from amplification of frequencies up to 1.7 times the edge frequency, f(e), of the DR. Better consonant identification might be achieved by replacing the band from f(e) to 1.7f(e) with a higher spectral band. We aimed to identify the optimal band, using simulations with normal-hearing listeners. In experiment 1, nonsense syllables were lowpass filtered to simulate DRs with f(e) of 0.5, 0.75, and 1.0 kHz. Identification was measured for each of these base bands alone and with a bandpass-filtered band added (but not transposed). The added band either extended from f(e) to 1.7f(e) or its center frequency was increased, keeping bandwidth fixed in ERBN-number. Performance improved with increasing center frequency and then reached an asymptote or declined. Experiment 2 used a mid-frequency base band. and a lower-frequency added band. The results also showed a beneficial effect of frequency separation of the added and base bands. Experiment 3 resembled experiment 1, but with bandwidth Fixed in Hertz. For higher-frequency added bands, the benefit was lower than for experiment 1.
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