The importance of temporal fine structure information in speech at different spectral regions for normal-hearing and hearing-impaired subjects
The importance of temporal fine structure information in speech at different spectral regions for normal-hearing and hearing-impaired subjects
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DOI：
10.1121/1.3293003
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发表时间：
2010-03-01
影响因子：
2.4
通讯作者：
Moore, Brian C. J.
中科院分区：
文献类型：
--
作者：
Hopkins, Kathryn;Moore, Brian C. J.
测量目标和竞争语音信号的语音接收阈值（SRT），处理以包含可变量的时间精细结构（TFS）信息。信号被滤波到30个1-ERB（N）宽通道（其中ERBN指正常听觉滤波器的带宽）中，这些通道或者被音调声码化，保留时间包络信息（使用希尔伯特变换提取），或者保持未处理，包含TFS和包络信息。当TFS逐渐引入时，SRT的改善进行了比较，从高频或低频通道开始。结果表明，在TFS信息跨频率区域的一些冗余。在第二个实验中，信号被分成五个6-ERB（N）宽的频谱区域，其中四个是音调声码。其余区域要么不存在（产生光谱陷波），要么存在且未经处理。SRT测量正常听力和听力受损的受试者。也包括所有通道都进行声码编码或未处理的条件。当TFS信息被添加到每个区域时，听力正常的受试者同样受益，这表明TFS信息在很宽的频率范围内很重要。听力受损的受试者受益较少，尽管受益因受试者而异。从TFS信息在语音中的好处是相关的心理物理测量TFS的敏感性在两个中心频率。(C)2010年美国声学学会。[DOI：10.1121/1.3293003]
Speech reception thresholds (SRTs) were measured for target and competing-speech signals, processed to contain variable amounts of temporal fine structure (TFS) information. Signals were filtered into 30 1-ERB(N) wide channels (where ERBN refers to the bandwidth of normal auditory filters), which were either tone vocoded, preserving temporal envelope information (extracted using the Hilbert transform), or left unprocessed, containing both TFS and envelope information. Improvements in SRT were compared when TFS was progressively introduced, starting with the high-or low-frequency channels. The results suggest some redundancy in the TFS information across frequency regions. In a second experiment, the signal was divided into five, 6-ERB(N)-wide spectral regions, four of which were tone vocoded. The remaining region was either absent (creating a spectral notch) or was present and unprocessed. SRTs were measured for normal-hearing and hearing-impaired subjects. Conditions where all channels were vocoded or unprocessed were also included. Normal-hearing subjects benefited similarly when TFS information was added to each region, suggesting that TFS information is important over a wide frequency range. Hearing-impaired subjects benefited less, although the benefit varied across subjects. Benefit from TFS information in speech was correlated with a psychophysical measure of TFS sensitivity obtained at two center frequencies. (C) 2010 Acoustical Society of America. [DOI: 10.1121/1.3293003]