Temporal modulation transfer functions obtained using sinusoidal carriers with normally hearing and hearing-impaired listeners
Temporal modulation transfer functions obtained using sinusoidal carriers with normally hearing and hearing-impaired listeners
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DOI：
10.1121/1.1385177
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发表时间：
2001-08-01
影响因子：
2.4
通讯作者：
Glasberg, BR
中科院分区：
文献类型：
--
作者：
Moore, BCJ;Glasberg, BR
时间调制传递函数，获得使用正弦载波为四个听力正常的科目和三个科目与轻度至中度耳蜗听力损失。载波频率为1000、2000和5000 Hz，调制频率范围为10至640 Hz，一个倍频程。听力正常的受试者使用30和80 dB SPL的水平进行测试。对于更高的水平，调制检测阈值变化与调制频率只有轻微的频率高达80赫兹，但降低高调制频率。这种降低可以归因于光谱边带的检测。对于较低的水平，阈值变化不大的调制频率为所有三个载波频率。对于大调制频率，阈值没有降低可以通过光谱边带的低感觉水平来解释。听力受损的受试者在80 dB SPL下进行测试，除了两种情况下载波频率的绝对阈值大于70 dB SPL;在这些情况下，使用90 dB的水平。这一结果与听力受损者的频谱边带比听力正常者的频谱边带更难检测的观点是一致的。对于两个较低的载波频率，随着调制频率的增加，阈值没有大的降低，并且在确实发生降低的情况下，这仅发生在320和640 Hz之间。对于5000 Hz载波，调制频率从10 Hz到80 Hz或160 Hz的阈值大致恒定，然后单调增加，在640 Hz时变得不可测量。该载波的结果可以反映时间分辨率的“纯”效应，而不受光谱边带检测的任何影响。结果表明，确定性刺激的时间分辨率是相似的正常听力和听力受损的听众。(C)2001年，美国声学学会。
Temporal modulation transfer functions were obtained using sinusoidal carriers for four normally hearing subjects and three subjects with mild to moderate cochlear hearing loss. Carrier frequencies were 1000, 2000 and 5000 Hz, and modulation frequencies ranged from 10 to 640 Hz in one-octave steps. The normally hearing subjects were tested using levels of 30 and 80 dB SPL. For the higher level, modulation detection thresholds varied only slightly with modulation frequency for frequencies up to 80 Hz, but decreased for high modulation frequencies. The decrease can be attributed to the detection of spectral sidebands. For the lower level, thresholds varied little with modulation frequency for all three carrier frequencies. The absence of a decrease in the threshold for large modulation frequencies can be explained by the low sensation level of the spectral sidebands. The hearing-impaired subjects were tested at 80 dB SPL, except for two cases where the absolute threshold at the carrier frequency was greater than 70 dB SPL; in these cases a level of 90 dB was used. The results were consistent with the idea that spectral sidebands were less detectable for the hearing-impaired than for the normally hearing subjects. For the two lower carrier frequencies, there were no large decreases in threshold with increasing modulation frequency, and where decreases did occur, this happened only between 320 and 640 Hz. For the 5000-Hz carrier, thresholds were roughly constant for modulation frequencies from 10 to 80 or 160 Hz, and then increased mono-tonically, becoming unmeasurable at 640 Hz. The results for this carrier may reflect "pure" effects of temporal resolution, without any influence from the detection of spectral sidebands. The results suggest that temporal resolution for deterministic stimuli is similar for normally hearing and hearing-impaired listeners. (C) 2001 Acoustical Society of America.