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Characterisation of tremor in normophonic voices

机译:正常语音中的震颤特征

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Vocal tremor is a low frequency instability of the voice that causes modulation of its amplitude and fundamental frequency. Among these two, frequency modulation is more relevant for perception and it has been shown to be present both in normophonic and dysphonic voices and to happen in similar frequency bands for both voice types. This paper presents a characterisation of the frequency modulating signal estimated for normophonic voices in terms of both its spectral characteristics and its statistical distribution. By using the discrete Fourier transform for data non-uniformly spaced in time domain, it is shown that the modulating signal may be either low-pass or band-pass (i.e. oscillating), though the low-pass case dominates in the analysed data. As for the values of the modulating signal, their distribution is shown to fairly fit a Gaussian distribution with a standard deviation that significantly depends on the average fundamental frequency.
机译:声音震颤是声音的低频不稳定性,会引起其振幅和基频的调制。在这两种语音中,调频与感知更相关,并且已显示出调频语音既存在于正常语音中也存在于发音困难的语音中,并且在两种语音类型中都出现在相似的频带中。本文从频谱特征和统计分布两方面介绍了针对正常语音估计的调频信号的特征。通过对时域中不均匀间隔的数据使用离散傅里叶变换,表明调制信号可以是低通或带通(即振荡),尽管低通情况在所分析的数据中占主导地位。至于调制信号的值,显示它们的分布相当符合高斯分布,其标准偏差明显取决于平均基频。

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