On the number of channels needed to understand speech
On the number of channels needed to understand speech
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DOI：
10.1121/1.427954
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发表时间：
1999-10-01
影响因子：
2.4
通讯作者：
Tu, ZM
中科院分区：
文献类型：
--
作者：
Loizou, PC;Dorman, M;Tu, ZM
最近的研究表明，当语音频谱被分成四个通道，然后重建为四个噪声带或频率等于通道中心频率的正弦波的总和时，可以实现高水平的语音理解。在这些研究中，使用单个男性说话者产生的句子来评估言语理解。实验1的目的是评估高水平的言语理解时，句子由多个说话者产生的通道的数量。在实验1中，由135个不同的说话者产生的句子被处理通过n（2小于或等于n小于或等于16）数量的通道，合成为频率等于滤波器的中心频率的n个正弦波的总和，并呈现给听力正常的听众进行识别。需要最少的实时通道来实现高水平（90%）的语音理解。渐近性能实现了八个通道，至少在本研究中使用的语音材料。实验1的结果表明，达到渐进性能所需的通道数量根据识别任务和/或听众关注精细语音细节的需要而变化。在实验2中，句子通过6和16个通道进行处理，并量化为少量的步骤。本实验的目的是调查是否听众使用跨通道的幅度差异编码频率信息，特别是当语音是通过少数通道处理。对于通过六个通道处理的句子，当频谱幅度被量化为一个小数字时，语音理解显著降低（
Recent studies have shown that high levels of speech understanding could be achieved when the speech spectrum was divided into four channels and then reconstructed as a sum of four noise bands or sine waves with frequencies equal to the center frequencies of the channels. In these studies speech understanding was assessed using sentences produced by a single male talker. The aim of experiment 1 was to assess the number of channels necessary for a high level of speech understanding when sentences were produced by multiple talkers. In experiment 1, sentences produced by 135 different talkers were processed through n (2 less than or equal to n less than or equal to 16) number of channels, synthesized as a sum of n sine waves with frequencies equal to the center frequencies of the filters, and presented to normal-hearing listeners for identification. A minimum of live channels was needed to achieve a high level (90%) of speech understanding. Asymptotic performance was achieved with eight channels, at least for the speech material used in this study. The outcome of experiment 1 demonstrated that the number of channels needed to reach asymptotic performance varies as a function of the recognition task and/or need for listeners to attend to fine phonetic detail. In experiment 2, sentences were processed through 6 and 16 channels and quantized into a small number of steps. The purpose of this experiment was to investigate whether listeners use across-channel differences in amplitude to code frequency information, particularly when speech is processed through a small number of channels. For sentences processed through six channels there was a significant reduction in speech understanding when the spectral amplitudes were quantized into a small number (