Spatial release from masking with noise-vocoded speech
Spatial release from masking with noise-vocoded speech
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DOI：
10.1121/1.2951964
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发表时间：
2008-09-01
影响因子：
2.4
通讯作者：
Helfer, Karen S.
中科院分区：
文献类型：
--
作者：
Freyman, Richard L.;Balakrishnan, Uma;Helfer, Karen S.
本研究探讨了目标话语和掩蔽话语之间的混淆性如何影响通过空间分离实现的掩蔽释放。通过用六通道包络声码处理语音，消除了竞争声音之间的重要区别特征，这模拟了使用人工耳蜗进行听力的某些方面。在第一个实验中，语音编码的目标无意义的句子，提出了对两个说话者的语音编码的掩蔽的条件下，提供不同的空间印象，但不可靠的线索，导致传统的释放掩蔽。令人惊讶的是，没有空间分离的好处被发现。空间释放的缺乏被假设为是高度积极的目标-掩蔽比的结果，需要理解声码语音，这可能已经足以减少混淆。在实验2中，从语音编码的无意义的句子中切除的话，提出了对相同的语音编码的两个说话者掩蔽在四个替代的被迫选择检测范式，其中阈值性能是在负的目标，以掩蔽比率。这里，掩蔽的空间释放超过20 dB。研究结果表明，信噪比的重要性，在观察“信息”掩蔽，并表示，应仔细注意这种类型的掩蔽植入处理的改善和听众开始，以取得成功，在较差的听力环境。(C)2008年，美国声学学会。
This study investigated how confusability between target and masking utterances affects the masking release achieved through spatial separation. Important distinguishing characteristics between competing voices were removed by processing speech with six-channel envelope vocoding, which simulates some aspects of listening with a cochlear implant. In the first experiment, vocoded target nonsense sentences were presented against two-talker vocoded maskers in conditions that provide different spatial impressions but not reliable cues that lead to traditional release from masking. Surprisingly, no benefit of spatial separation was found. The absence of spatial release was hypothesized to be the result of the highly positive target-to-masker ratios necessary to understand vocoded speech, which may have been sufficient to reduce confusability. In experiment 2, words excised from the vocoded nonsense sentences were presented against the same vocoded two-talker masker in a four-alternative forced-choice detection paradigm where threshold performance was achieved at negative target-to-masker ratios. Here, the spatial release from masking was more than 20 dB. The results suggest the importance of signal-to-noise ratio in the observation of "informational" masking and indicate that careful attention should be paid to this type of masking as implant processing improves and listeners begin to achieve success in poorer listening environments. (C) 2008 Acoustical Society of America.