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Phonemic restoration of interrupted locally time-reversed speech
Attention, Perception, & Psychophysics ( IF 1.7 ) Pub Date : 2021-04-13 , DOI: 10.3758/s13414-021-02292-3
Kazuo Ueda , Valter Ciocca

Intelligibility of temporally degraded speech was investigated with locally time-reversed speech (LTR) and its interrupted version (ILTR). Control stimuli comprising interrupted speech (I) were also included. Speech stimuli consisted of 200 Japanese meaningful sentences. In interrupted stimuli, speech segments were alternated with either silent gaps or pink noise bursts. The noise bursts had a level of − 10, 0 or + 10 dB relative to the speech level. Segment duration varied from 20 to 160 ms for ILTR sentences, but was fixed at 160 ms for I sentences. At segment durations between 40 and 80 ms, severe reductions in intelligibility were observed for ILTR sentences, compared with LTR sentences. A substantial improvement in intelligibility (30–33%) was observed when 40-ms silent gaps in ILTR were replaced with 0- and + 10-dB noise. Noise with a level of − 10 dB had no effect on the intelligibility. These findings show that the combined effects of interruptions and temporal reversal of speech segments on intelligibility are greater than the sum of each individual effect. The results also support the idea that illusory continuity induced by high-level noise bursts improves the intelligibility of ILTR and I sentences.



中文翻译:

中断的本地时间倒转语音的音位恢复

使用本地时间反转语音(LTR)及其中断版本(ILTR)对时间退化语音的可理解性进行了研究。还包括包括打断的语音(I)的控制刺激。言语刺激包括200个日语有意义的句子。在中断的刺激中,语音段交替出现无声间隙或粉红色噪声爆发。相对于语音水平,噪声突发的水平为− 10、0或+ 10 dB。对于ILTR语句,段持续时间从20到160 ms不等,但是对于I语句,段持续时间固定为160 ms。在段持续时间为40到80毫秒之间,与LTR语句相比,ILTR语句的清晰度明显下降。当用0-和+ 10-dB噪声代替ILTR中的40-ms静默间隙时,可清晰度明显提高(30-33%)。− 10 dB的噪声对清晰度没有影响。这些发现表明,语音片段的打断和时间反转对可懂度的综合影响大于每个单独影响的总和。结果还支持这样的观点,即高水平的噪声爆发引起的幻觉连续性提高了ILTR和I句子的清晰度。

更新日期:2021-04-14
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