Larsby B, Arlinger S
Department of Technical Audiology, University Hospital, Linköping, Sweden.
Audiology. 1994 May-Jun;33(3):165-76. doi: 10.3109/00206099409071877.
Speech recognition (SRT) and just-follow-conversation (JFC) tasks were performed by normal-hearing and hearing-impaired listeners matched for age and sex using three masking backgrounds: speech spectrum random noise, continuous forward speech and reversed speech. In the SRT task, the signal-to-noise (S/N) ratio for 50% correctly repeated words of short, 5-word, low-redundancy sentences was determined. In the JFC task, the listener adjusted the speech level until he felt he could just understand what was being said. The listeners needed a higher S/N ratio for the JFC task than for the SRT task. The speech maskers gave less masking than the random noise. No difference between forward and reversed speech was observed. The hearing-impaired listeners needed a higher S/N ratio than the normal-hearing subjects. Correlations between results obtained with the SRT and the JFC techniques were significant with speech but not with random noise as masker. The highest correlations between pure-tone hearing thresholds at different frequencies and results in the SRT and JFC tests were seen at 0.5 and 1 kHz.
正常听力和听力受损的受试者（年龄和性别匹配）在三种掩蔽背景下进行了语音识别（SRT）和跟读对话（JFC）任务，这三种掩蔽背景分别是：语音频谱随机噪声、连续正向语音和反向语音。在SRT任务中，确定了5个单词的简短、低冗余句子中50%正确重复单词时的信噪比（S/N）。在JFC任务中，受试者调整语音电平，直到感觉能够理解所说内容。与SRT任务相比，受试者在JFC任务中需要更高的信噪比。语音掩蔽器的掩蔽作用比随机噪声小。未观察到正向语音和反向语音之间存在差异。听力受损的受试者比正常听力的受试者需要更高的信噪比。当使用语音作为掩蔽器时，SRT和JFC技术所得结果之间存在显著相关性，但使用随机噪声作为掩蔽器时则不然。在0.5和1kHz频率处，不同频率的纯音听力阈值与SRT和JFC测试结果之间的相关性最高。
