title: Polyvinylidene fluoride sensor-based method for unconstrained snoring detection.
abstract: We established and tested a snoring detection method using a polyvinylidene fluoride (PVDF) sensor for accurate, fast, and motion-artifact-robust monitoring of snoring events during sleep. Twenty patients with obstructive sleep apnea participated in this study. The PVDF sensor was located between a mattress cover and mattress, and the patients' snoring signals were unconstrainedly measured with the sensor during polysomnography. The power ratio and peak frequency from the short-time Fourier transform were used to extract spectral features from the PVDF data. A support vector machine was applied to the spectral features to classify the data into either the snore or non-snore class. The performance of the method was assessed using manual labelling by three human observers as a reference. For event-by-event snoring detection, PVDF data that contained 'snoring' (SN), 'snoring with movement' (SM), and 'normal breathing' epochs were selected for each subject. As a result, the overall sensitivity and the positive predictive values were 94.6% and 97.5%, respectively, and there was no significant difference between the SN and SM results. The proposed method can be applied in both residential and ambulatory snoring monitoring systems.
authors.affiliation: Interdisciplinary Program in Bioengineering, Seoul National University, Seoul, Korea.
authors.forename: Su Hwan
authors.initials: SH
authors.lastname: Hwang
authors.forename: Chung Min
authors.initials: CM
authors.lastname: Han
authors.forename: Hee Nam
authors.initials: HN
authors.lastname: Yoon
authors.forename: Da Woon
authors.initials: DW
authors.lastname: Jung
authors.forename: Yu Jin
authors.initials: YJ
authors.lastname: Lee
authors.forename: Do-Un
authors.initials: DU
authors.lastname: Jeong
authors.forename: Kwang Suk
authors.initials: KS
authors.lastname: Park
mesh_terms: D001513:Beds; D004867:Equipment Design; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation* / Q000379:methods*; D011145:Polyvinyls; D011187:Posture / Q000502:physiology; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D012890:Sleep / Q000502:physiology; D012913:Snoring / Q000175:diagnosis* / Q000503:physiopathology*; D060388:Support Vector Machine; D005465:Fluorocarbon Polymers
chemical_list: D011145:Polyvinyls; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers