Hou Z, Pavlovic C V
Audiology Department, Massachusetts Eye and Ear Infirmary, Boston 02114.
J Acoust Soc Am. 1994 Sep;96(3):1325-40. doi: 10.1121/1.410279.
Envelopes of speech were smeared in 23 parallel frequency channels. The smeared speech was presented to normal-hearing listeners, and the effects of different smearing magnitudes on speech intelligibility were measured by obtaining speech recognition scores. It was demonstrated theoretically and experimentally that the system consisting of the computer smearing and the auditory system had reduced temporal resolution but nearly normal frequency resolution. Speech intelligibility of the processed vowel-consonant nonsense syllables was tested for low- and high-pass filter conditions. The overall speech recognition scores as well as the recognition scores of the consonants grouped according to articulatory features were analyzed. The results indicated that smearing with a narrow temporal window did not degrade speech. The larger equivalent rectangular durations (ERDs) of the resultant temporal window (RTW) of the combined system (temporal smearing plus auditory system) produced a small but significant reduction in speech intelligibility for the low-pass filter condition. Scores for the RTWs > 16 ms were significantly different from the score for the 7.7-ms RTW for the high-pass filter condition, but this effect was small and did not differ across articulatory features.
语音包络在23个平行频率通道中进行涂抹。将涂抹后的语音呈现给听力正常的听众，并通过获取语音识别分数来测量不同涂抹幅度对语音可懂度的影响。理论和实验均表明，由计算机涂抹和听觉系统组成的系统具有降低的时间分辨率，但频率分辨率几乎正常。针对低通和高通滤波器条件，测试了处理后的元音-辅音无意义音节的语音可懂度。分析了总体语音识别分数以及根据发音特征分组的辅音识别分数。结果表明，使用狭窄时间窗口进行涂抹不会降低语音质量。组合系统（时间涂抹加听觉系统）的合成时间窗口（RTW）的等效矩形持续时间（ERD）越大，在低通滤波器条件下语音可懂度会有小幅但显著的降低。对于高通滤波器条件，RTW大于16毫秒时的分数与7.7毫秒RTW时的分数有显著差异，但这种影响较小，且在不同发音特征之间没有差异。
