EFFECT OF MULTIPLE SPEECH-LIKE MASKERS ON BINAURAL SPEECH RECOGNITION IN NORMAL AND IMPAIRED HEARING
EFFECT OF MULTIPLE SPEECH-LIKE MASKERS ON BINAURAL SPEECH RECOGNITION IN NORMAL AND IMPAIRED HEARING
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DOI：
10.1121/1.404209
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发表时间：
1992-12-01
影响因子：
2.4
通讯作者：
PLOMP, R
中科院分区：
文献类型：
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作者：
BRONKHORST, AW;PLOMP, R
对17名听力正常的听者和17名听力受损的听者在模拟自由场条件下的言语接收阈值(SRT)进行了测量。长期平均频谱相同的语音和噪声刺激被记录在消声室中的Kemar假人身上，并通过耳机呈现给受试者。噪声是利用语音的包络波动进行调制的。模拟了几种情况，扬声器总是在听者的前面，遮蔽物或者也在前面，或者在听者周围对称或不对称地放置。结果表明，在所有情况下，听力障碍者的听力表现都比正常听力者差。两组间的平均SRT差异在4.2-10分贝之间。对于听力正常的听者来说，掩蔽器中的调制似乎是一个重要的信号，他们从掩蔽中经历了高达5分贝的释放，而对听力受损的听者几乎没有好处。当掩蔽物从前额位置移动到听者周围位置时，所产生的增益在正常听力时为1.5至8分贝，而对于听力受损者为1至6.5分贝。这在很大程度上取决于戴面具的人数和他们的位置，但对听力损害的影响较小。对于听力正常的人和听力受损的人，在所有条件下，双耳和最佳耳朵听力的SRT之间的差异(“鸡尾酒会效应”)约为3分贝。
Speech-reception thresholds (SRT) were measured for 17 normal-hearing and 17 hearing-impaired listeners in conditions simulating free-field situations with between one and six interfering talkers. The stimuli, speech and noise with identical long-term average spectra, were recorded with a KEMAR manikin in an anechoic room and presented to the subjects through headphones. The noise was modulated using the envelope fluctuations of the speech. Several conditions were simulated with the speaker always in front of the listener and the maskers either also in front, or positioned in a symmetrical or asymmetrical configuration around the listener. Results show that the hearing impaired have significantly poorer performance than the normal hearing in all conditions. The mean SRT differences between the groups range from 4.2-10 dB. It appears that the modulations in the masker act as an important cue for the normal-hearing listeners, who experience up to 5-dB release from masking, while being hardly beneficial for the hearing impaired listeners. The gain occurring when maskers are moved from the frontal position to positions around the listener varies from 1.5 to 8 dB for the normal hearing, and from 1 to 6.5 dB for the hearing impaired. It depends strongly on the number of maskers and their positions, but less on hearing impairment. The difference between the SRTs for binaural and best-ear listening (the "cocktail party effect") is approximately 3 dB in all conditions for both the normal-hearing and the hearing-impaired listeners.