Acoustic and linguistic factors in the perception of bandpass-filtered speech.
Acoustic and linguistic factors in the perception of bandpass-filtered speech.
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带通滤波语音感知中的声学和语言因素。
DOI：
10.1121/1.1340643
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
P. Assmann
中科院分区：
文献类型：
--
作者：
Ginger Stickney;P. Assmann
当通过仅传输一小部分可听频谱的窄带通滤波器处理时，语音对于听力正常的听众来说仍然可以理解。两个实验研究了窄带语音高清晰度的基础。实验1证实，日常英语句子可以准确识别（82%-98%的单词正确）时，在1500，2100和3000赫兹的中心频率过滤的报告。然而，窄带低可预测性（LP）句子的识别准确度低于高可预测性（HP）句子（得分低20%），而切除的窄带单词甚至比LP句子更难理解（进一步下降23%）。虽然实验1揭示了窄带和宽带句子在会话语音水平上的相似水平，但实验2表明，窄带句子的语音接收阈值明显较差（>30 dB）。对于在阈值处窄带和宽带语音之间的这种增加的差异（与会话语音电平相比）的一种解释是，滤波器的倾斜过渡带中的频谱分量为窄带语音的识别提供了重要线索，但是随着信号电平降低，这些分量变得听不见。实验2还表明，性能下降的语音掩蔽（一个单一的竞争说话）的介绍。窄带和宽带语音的阈值提升相似（平均为11 dB），但由于窄带句子需要比宽带句子高得多的声级才能在安静时达到阈值，因此它们的目标与掩蔽物比率非常不同（窄带句子为+23 dB，宽带句子为-12 dB）。在实验1中，性能更好的HP比LP句子。窄带句子的LP-HP差异大于宽带句子，这表明当语音被窄带滤波扭曲时，上下文提供了更大的好处。
Speech can remain intelligible for listeners with normal hearing when processed by narrow bandpass filters that transmit only a small fraction of the audible spectrum. Two experiments investigated the basis for the high intelligibility of narrowband speech. Experiment 1 confirmed reports that everyday English sentences can be recognized accurately (82%-98% words correct) when filtered at center frequencies of 1500, 2100, and 3000 Hz. However, narrowband low predictability (LP) sentences were less accurately recognized than high predictability (HP) sentences (20% lower scores), and excised narrowband words were even less intelligible than LP sentences (a further 23% drop). While experiment 1 revealed similar levels of performance for narrowband and broadband sentences at conversational speech levels, experiment 2 showed that speech reception thresholds were substantially (>30 dB) poorer for narrowband sentences. One explanation for this increased disparity between narrowband and broadband speech at threshold (compared to conversational speech levels) is that spectral components in the sloping transition bands of the filters provide important cues for the recognition of narrowband speech, but these components become inaudible as the signal level is reduced. Experiment 2 also showed that performance was degraded by the introduction of a speech masker (a single competing talker). The elevation in threshold was similar for narrowband and broadband speech (11 dB, on average), but because the narrowband sentences required considerably higher sound levels to reach their thresholds in quiet compared to broadband sentences, their target-to-masker ratios were very different (+23 dB for narrowband sentences and -12 dB for broadband sentences). As in experiment 1, performance was better for HP than LP sentences. The LP-HP difference was larger for narrowband than broadband sentences, suggesting that context provides greater benefits when speech is distorted by narrow bandpass filtering.
1/3 倍频程语音的清晰度：标称通带外部频率的贡献大于标称通带内部频率的贡献。
DOI：
10.1121/1.427606
发表时间：
1999
期刊：
The Journal of the Acoustical Society of America
影响因子：
--
作者：
Warren,RM;BashfordJr,JA
通讯作者：
BashfordJr,JA