Maximal Ambient Noise Levels and Type of Voice Material Required for Valid Use of Smartphones in Clinical Voice Research
Maximal Ambient Noise Levels and Type of Voice Material Required for Valid Use of Smartphones in Clinical Voice Research
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DOI：
10.1016/j.jvoice.2017.02.017
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发表时间：
2017-09-01
期刊：
影响因子：
2.2
通讯作者：
DeJonckere, Philippe
中科院分区：
文献类型：
--
作者：
Lebacq, Jean;Schoentgen, Jean;DeJonckere, Philippe
目的。智能手机技术为记录患者的标准化语音样本并将音频文件传输到语音实验室提供了新的机会。这大大提高了基线设计的成就，用于语音处理效率的研究。然而，基本要求是智能手机适合记录和数字化病理声音（主要以周期扰动和噪音为特征）而没有明显的失真。在之前的一篇文章中，使用真实合成的异常声音样本（/a:/）进行了测试，在所有组合中都有三个精确已知的抖动和噪声水平。在(1)通过智能手机录音，(2)直接麦克风录音和(3)由合成器生成的声音文件中测量的抖动和噪声与谐波比之间发现了高度相关性。在目前的工作中，进行了类似的实验(1)在环境噪声水平增加的情况下，(2)使用合成的异常语音样本（/a:/）以及模拟异常短浊音（/aiuaiu /）的合成语音材料。结果。环境噪音水平可达50 dBA。然而，在一些智能手机中会发生信号处理，当形成峰变化与运行语音类似时，这会显著影响抖动和噪声与谐波比的估计。结论是，语音材料必须暂时限制在持续的/a/。
Purpose. Smartphone technology provides new opportunities for recording standardized voice samples of patients and transmitting the audio files to the voice laboratory. This drastically improves the achievement of baseline designs, used in research on efficiency of voice treatments. However, the basic requirement is the suitability of smartphones for recording and digitizing pathologic voices (mainly characterized by period perturbations and noise) without significant distortion. In a previous article, this was tested using realistic synthesized deviant voice samples (/a:/) with three precisely known levels of jitter and of noise in all combinations. High correlations were found between jitter and noise to harmonics ratio measured in (1) recordings via smartphones, (2) direct microphone recordings, and (3) sound files generated by the synthesizer. In the present work, similar experiments were performed (1) in the presence of increasing levels of ambient noise and (2) using synthetic deviant voice samples (/a:/) as well as synthetic voice material simulating a deviant short voiced utterance (/aiuaiuaiu/).Results. Ambient noise levels up to 50 dBA are acceptable. However, signal processing occurs in some smartphones, and this significantly affects estimates of jitter and noise to harmonics ratio when formant changes are introduced in analogy with running speech. The conclusion is that voice material must provisionally be limited to a sustained /a/.