Journal ArticleDOI
Adaptive reduction of heart sounds from lung sounds using fourth-order statistics
TLDR
An adaptive heart-noise reduction method, based on fourth-order statistics (FOS) of the recorded signal, without requiring recorded "noise-only" reference signal, is presented, which uses adaptive filtering to preserve the entire spectrum.Abstract:
When recording lung sounds, an incessant noise source occurs due to heart sounds. This noise source severely contaminates the breath sound signal and interferes in the analysis of lung sounds. In this paper, an adaptive heart-noise reduction method, based on fourth-order statistics (FOS) of the recorded signal, without requiring recorded "noise-only" reference signal, is presented. This algorithm uses adaptive filtering to preserve the entire spectrum. Furthermore, the proposed filter is independent of Gaussian uncorrelated noise and insensitive to the step-size parameter. It converges fast with small excess errors and, due to the narrowband nature of heart noise (HN), it requires a very small number of taps. Results from experiments with healthy subjects indicate a local HN reduction equal to or greater than 90%.read more
Citations
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Journal ArticleDOI
Application of higher order statistics/spectra in biomedical signals—A review
TL;DR: Most of the biomedical signals are non-linear, non-stationary and non-Gaussian in nature and therefore it can be more advantageous to analyze them with HOS compared to the use of second-order correlations and power spectra.
Journal ArticleDOI
Localizing Heart Sounds in Respiratory Signals Using Singular Spectrum Analysis
TL;DR: Singular spectrum analysis (SSA), a powerful time series analysis technique, is used in this paper and the proposed method outperforms the wavelet-based method in terms of false detection and also correlation with the underlying heart sounds.
PatentDOI
Sleep apnea monitoring and diagnosis based on pulse oximetery and tracheal sound signals
Zahra Moussavi,Azadeh Yadollahi +1 more
TL;DR: In this article, a finger probe was used to measure the relative and absolute energy and duration of the sound periods to classify them into three groups of breath, snore and noise.
Journal ArticleDOI
A robust method for estimating respiratory flow using tracheal sounds entropy
Azadeh Yadollahi,Zahra Moussavi +1 more
TL;DR: A robust and novel method for estimating flow using entropy of the band pass filtered tracheal sounds is proposed, which requires only one breath for calibration and can estimate any flow rate even out of the range of calibration flow.
Journal ArticleDOI
Attitude, certainty and allusions to common knowledge in scientific research articles
TL;DR: The authors explored three categories of markers: attitude, certainty, and common knowledge markers, and its main aim is to compile a taxonomy of the lexical and discourse-based realisations of these markers and their pragmatic functions, as they are manifested in RAs from the field of electronic and electrical engineering.
References
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Book
Textbook of Medical Physiology
Arthur C. Guyton,John E. Hall +1 more
TL;DR: Textbook of medical physiology , Textbook ofmedical physiology , کتابخانه دیجیتال جندی شاپور اهواز
Journal ArticleDOI
Textbook of Medical Physiology
TL;DR: Textbook of medical physiology, Textbook of Medical Physiology, this paper, textbook of medicine, textbooks of medical science, text book of medical literature, textbook medical physiology.
Journal ArticleDOI
Adaptive noise cancelling: Principles and applications
Bernard Widrow,J.R. Glover,John M. McCool,J. Kaunitz,C.S. Williams,R.H. Hearn,James R. Zeidler,Jr. Eugene Dong,R.C. Goodlin +8 more
TL;DR: It is shown that in treating periodic interference the adaptive noise canceller acts as a notch filter with narrow bandwidth, infinite null, and the capability of tracking the exact frequency of the interference; in this case the canceller behaves as a linear, time-invariant system, with the adaptive filter converging on a dynamic rather than a static solution.
Book
Higher-Order Spectra Analysis: A Nonlinear Signal Processing Framework
TL;DR: In this paper, the authors define and define Cumulants and Cumulant Spectra, and present a method for the estimation of polyspectra of deterministic signals, based on non-minimum phase signal reconstruction.
Journal ArticleDOI
Signal processing with higher-order spectra
TL;DR: The strengths and limitations of correlation-based signal processing methods, with emphasis on the bispectrum and trispectrum, and the applications of higher-order spectra in signal processing are discussed.
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