谱时调制检测和单词识别中的噪声适应性

IF 2.6 2区 医学 Q1 AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY
David López-Ramos, Miriam I. Marrufo-Pérez, Almudena Eustaquio-Martín, Luis E. López-Bascuas, Enrique A. Lopez-Poveda
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引用次数: 0

摘要

噪声适应是指当感兴趣的信号在噪声中延迟时,听觉功能得到改善。在此,我们研究了噪声适应是否发生在频谱、时间和频谱时空调制检测以及语音识别中。18 名听力正常的成年人参加了实验。在调制检测任务中,信号为 200ms 的频谱和/或时间调制波纹噪声。频谱调制率为每倍频程两个周期,时间调制率为 10 赫兹,频谱-时间调制将这两种调制结合在一起,形成一个向下移动的波纹。我们还进行了对照实验,以确定实验结果是否适用于向上移动的波纹。在语音识别任务中,信号由未经处理或仅保留包络线索的声码字组成。在安静和白噪声(60 dB SPL)条件下,噪声-信号开始延迟为 50 ms(早期条件)和 800 ms(晚期条件)时,测量信噪比为 0 dB 时的调制检测阈值和语音接收阈值。适应度以早期和晚期条件下的阈值差计算。词汇识别的适应性对词汇编码(2.1 dB)有显著的统计学意义,而对自然词汇(0.6 dB)则没有。在频谱(2.1 dB)和时间(2.2 dB)调制检测中,发现适应具有显著的统计意义,但在频谱-时间调制检测中却没有发现适应(向下波纹:0.0 dB,向上波纹:-0.4 dB)。研究结果表明,语音识别中的噪声适应与谱时调制线索编码的改进无关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Adaptation to Noise in Spectrotemporal Modulation Detection and Word Recognition
Noise adaptation is the improvement in auditory function as the signal of interest is delayed in the noise. Here, we investigated if noise adaptation occurs in spectral, temporal, and spectrotemporal modulation detection as well as in speech recognition. Eighteen normal-hearing adults participated in the experiments. In the modulation detection tasks, the signal was a 200ms spectrally and/or temporally modulated ripple noise. The spectral modulation rate was two cycles per octave, the temporal modulation rate was 10 Hz, and the spectrotemporal modulations combined these two modulations, which resulted in a downward-moving ripple. A control experiment was performed to determine if the results generalized to upward-moving ripples. In the speech recognition task, the signal consisted of disyllabic words unprocessed or vocoded to maintain only envelope cues. Modulation detection thresholds at 0 dB signal-to-noise ratio and speech reception thresholds were measured in quiet and in white noise (at 60 dB SPL) for noise-signal onset delays of 50 ms (early condition) and 800 ms (late condition). Adaptation was calculated as the threshold difference between the early and late conditions. Adaptation in word recognition was statistically significant for vocoded words (2.1 dB) but not for natural words (0.6 dB). Adaptation was found to be statistically significant in spectral (2.1 dB) and temporal (2.2 dB) modulation detection but not in spectrotemporal modulation detection (downward ripple: 0.0 dB, upward ripple: −0.4 dB). Findings suggest that noise adaptation in speech recognition is unrelated to improvements in the encoding of spectrotemporal modulation cues.
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来源期刊
Trends in Hearing
Trends in Hearing AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGYOTORH-OTORHINOLARYNGOLOGY
CiteScore
4.50
自引率
11.10%
发文量
44
审稿时长
12 weeks
期刊介绍: Trends in Hearing is an open access journal completely dedicated to publishing original research and reviews focusing on human hearing, hearing loss, hearing aids, auditory implants, and aural rehabilitation. Under its former name, Trends in Amplification, the journal established itself as a forum for concise explorations of all areas of translational hearing research by leaders in the field. Trends in Hearing has now expanded its focus to include original research articles, with the goal of becoming the premier venue for research related to human hearing and hearing loss.
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