| Autor: |
Supin, Alexander Y., Milekhina, Olga, Nechaev, Dmitry, Sysueva, Evgenia |
| Předmět: |
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| Zdroj: |
Proceedings of Meetings on Acoustics; 5/13/2019, Vol. 36 Issue 1, p1-8, 8p |
| Abstrakt: |
Rippled-spectrum signals are used for signal-resolution measurements in hearing-impaired listeners and cochlear implant users. Two mechanisms are presumably responsible for rippled-spectrum resolution. The excitation-pattern mechanism determines the ripple-density resolution (ripples/oct). The temporal-processing mechanism determines the ripple frequency spacing limit (kHz). The contributions of these two mechanisms can be assessed by comparing the resolutions of band-limited rippled spectra with different center frequencies. Ripple-density resolutions of half-octave rippled spectra were measured at center frequencies ranging from 0.5 to 4 kHz. The measurements were performed either by discrimination between a rippled-spectrum test and reference signals differing by ripple phases or by discrimination between a rippled-spectrum test and a nonrippled reference signal. For discrimination between rippled-spectrum tests and reference signals, the resolution specified in ripples/oct depended very little on the center frequency, as predicted by the excitation-pattern model. For discrimination between rippled tests and nonrippled reference signals, the resolution specified in the ripple frequency spacing depended very little on the center frequency, as predicted by the temporal-processing model. This study concluded that contributions of the excitation-pattern and temporal-processing mechanisms depend on the discrimination task. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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