Recognition of filtered words in noise at higher-than-normal levels: Decreases in scores with and without increases in masking
Recognition of filtered words in noise at higher-than-normal levels: Decreases in scores with and without increases in masking
复制标题
DOI：
10.1121/1.1953127
复制
发表时间：
2005-08-01
影响因子：
2.4
通讯作者：
Ahlstrom, JB
中科院分区：
文献类型：
--
作者：
Dubno, JR;Horwitz, AR;Ahlstrom, JB
为了研究频谱效应对高水平噪声中言语识别能力下降的影响，对18名听力正常的年轻人的言语识别能力进行了评估，包括低通滤波的言语和言语形掩蔽语或高通滤波的言语和言语形掩蔽语，三个言语水平（70、77和84 dB SPL），三个信噪比（+8、+3和-2 dB）。一个额外的低电平噪声产生等效的掩蔽阈值的所有科目。纯音听阈在安静和所有掩蔽。如果单词识别完全由信噪比决定，并且独立于信号水平和语音和掩蔽物的频谱内容，则对于低频和高频语音和掩蔽物，分数应该随着水平的增加而保持不变。当信噪比保持不变时，随着言语水平的增加，低频掩蔽者对低频言语的识别和高频掩蔽者对高频言语的识别显着下降。对于低频语音和语音形状的掩蔽，下降归因于掩蔽的非线性增长，降低了高水平的“有效”信噪比，类似于以前的结果，宽带语音和语音形状的掩蔽。掩蔽增长和降低的“有效”信噪比解释了一些但不是全部的高频掩蔽者对高频语音的识别能力下降。(C)2005年美国声学学会。
To examine spectral effects on declines in speech recognition in noise at high levels, word recognition for, 18 young adults with normal hearing was assessed for low-pass-filtered speech and speech-shaped maskers or high-pass-filtered speech and speech-shaped maskers at three speech levels (70, 77, and 84 dB SPL) for each of three signal-to-noise ratios (+8, +3, and -2 dB). An additional low-level noise produced equivalent masked thresholds for all subjects. Pure-tone thresholds were measured in quiet and in all maskers. If word recognition was determined entirely by signal-to-noise ratio, and was independent of signal levels and the spectral content of speech and maskers, scores should remain constant with increasing level for both low- and high-frequency speech and maskers. Recognition of low-frequency speech in low-frequency maskers and high-frequency speech in high-frequency maskers decreased significantly with increasing speech level when signal-to-noise ratio was held constant. For low-frequency speech and speech-shaped maskers, the decline was attributed to nonlinear growth of masking which reduced the "effective" signal-to-noise ratio at high levels, similar to previous results for broadband speech and speech-shaped maskers. Masking growth and reduced "effective" signal-to-noise ratio accounted for some but not all the decline in recognition of high-frequency speech in high-frequency maskers. (C) 2005 Acoustical Society of America.