Investigating the statistical properties of the swallowing sounds

Shirazi, Samaneh Sarraf; Moussavi, Zahra

doi:10.1109/iembs.2011.6091488

2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society 2011

DOI: 10.1109/iembs.2011.6091488

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Investigating the statistical properties of the swallowing sounds

Samaneh Sarraf Shirazi

Zahra Moussavi

Abstract: In this paper the statistical properties of the swallowing sound is discussed. This knowledge is required for the acoustical modeling of the swallowing mechanism as it is important to select an appropriate type of the system (i.e. linear vs. nonlinear) for modeling. The tests of linearity and gaussianity were performed. The results of the statistical test of gaussianity showed a nonGaussian distribution of the swallowing sound signals. Also, the test of linearity exhibited the nonlinear characteristics of the … Show more

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2015

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Cited by 2 publications

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Dysphagia Screening: Contributions of Cervical Auscultation Signals and Modern Signal-Processing Techniques

Dudik

Coyle

Sejdić

2015

IEEE Trans. Human-Mach. Syst.

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Cervical auscultation is the recording of sounds and vibrations caused by the human body from the throat during swallowing. While traditionally done by a trained clinician with a stethoscope, much work has been put towards developing more sensitive and clinically useful methods to characterize the data obtained with this technique. The eventual goal of the field is to improve the effectiveness of screening algorithms designed to predict the risk that swallowing disorders pose to individual patients’ health and safety. This paper provides an overview of these signal processing techniques and summarizes recent advances made with digital transducers in hopes of organizing the highly varied research on cervical auscultation. It investigates where on the body these transducers are placed in order to record a signal as well as the collection of analog and digital filtering techniques used to further improve the signal quality. It also presents the wide array of methods and features used to characterize these signals, ranging from simply counting the number of swallows that occur over a period of time to calculating various descriptive features in the time, frequency, and phase space domains. Finally, this paper presents the algorithms that have been used to classify this data into ‘normal’ and ‘abnormal’ categories. Both linear as well as non-linear techniques are presented in this regard.

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Dysphagia Screening: Contributions of Cervical Auscultation Signals and Modern Signal-Processing Techniques

Dudik

Coyle

Sejdić

2015

IEEE Trans. Human-Mach. Syst.

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A study on the stationarity and Gaussianity of the background noise in land-seismic prospecting

Zhong

et al. 2015

GEOPHYSICS

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In the denoising of seismic prospecting, background noise is often assumed to be stationary and Gaussian. However, this is not always appropriate for real seismic data. We used statistical tests to assess the stationarity and Gaussianity of land seismic data. The data we used for the analyses were passive noise records collected with receiver arrays in different land environments, e.g., deserts, steppes, and mountains. The results showed that the background noise was not strictly stationary, but locally stationary. The noise could be treated as a stationary series only in short time periods, whereas the stationarity became poor with increasing the time length of the noise records. By analyzing the behavior of noise data, we determined that the nonstationary noise always had more energy in the high-frequency band, which varied with the acquisition environments. The wind strength and the complexity of the environmental conditions also impacted the noise stationarity. Moreover, we found that noise in complex environments has a higher degree of Gaussianity than noise in simpler environment. Most of the noise records appeared to be a Gaussian process when examined over a period longer than 20 s, but they were found to be non-Gaussian when examined over shorter time periods of the order of 1 s.

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Investigating the statistical properties of the swallowing sounds

Cited by 2 publications

References 16 publications

Dysphagia Screening: Contributions of Cervical Auscultation Signals and Modern Signal-Processing Techniques

Dysphagia Screening: Contributions of Cervical Auscultation Signals and Modern Signal-Processing Techniques

A study on the stationarity and Gaussianity of the background noise in land-seismic prospecting

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