Results 211 to 220 of about 54,615 (253)
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Respiratory Sounds: Laryngeal Origin Sounds
2018Laryngeal sounds reflect turbulence of air in the upper airway and are harsher and higher in pitch than normal lung sounds. A linear relationship between tracheal sounds and flow has been observed, and the frequency characteristics are associated with body height and length of the trachea in children.
Nicola Barker, Heather Elphick
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Asymmetry of respiratory sounds and thoracic transmission
Medical & Biological Engineering & Computing, 1997Breath sounds heard with a stethoscope over homologous sites of both lungs in healthy subjects are presumed to have similar characteristics. Passively transmitted sounds introduced at the mouth, however, are known to lateralise, with right-over-left dominance in power at the anterior upper chest. Both spontaneous breath sounds and passively transmitted
H, Pasterkamp, S, Patel, G R, Wodicka
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Detection of Respiratory Sounds at the External Ear
IEEE Transactions on Biomedical Engineering, 2004Several clinical and ambulatory settings necessitate respiratory monitoring without a mouthpiece or facemask. Several studies have demonstrated the utility of breathing sound measurements performed on the chest or neck to detect airflow. However, there are limitations to skin surface measurements, including susceptibility to external noise and ...
Gary A. Pressler +3 more
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Time-scale segmentation of respiratory sounds
Technology and Health Care, 1998Respiratory sounds are composed of various events: normal and so-called adventitious sounds. These phenomena present a wide range of characteristics which make difficult their analysis with a single technique. Adapted time-frequency and time-scale techniques allow to fit best, under constraints, the accuracy of analysis of a time segmentation and, by ...
E, Ademovic +2 more
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Digital Spectrum Analysis of Respiratory Sound
IEEE Transactions on Biomedical Engineering, 1981The applcation of the fast Fourier transform in the digital analysis of various biological signals in the frequency domain is well-known. In this paper a method is described for spectrum analysis of respiratory sound using the technique of fast Fourier transform.
S K, Chowdhury, A K, Majumder
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Effect of Gas Density on Respiratory Sounds
American journal of respiratory and critical care medicine, 1996Abstract The generation of normal lung sounds by turbulent air flow has been questioned because gas density appears to have only a minor effect. We studied whether gas density has a greater influence on lung sounds at higher frequencies than traditionally measured. Six healthy adult men breathed air followed by a mixture of 80% helium
H, Pasterkamp, I, Sanchez
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Archivos de bronconeumologia, 1995
After having invented the stethoscope, Laennec published his treatise on auscultation in 1819, describing the acoustic events generated by ventilation and linking them with anatomopathological findings. The weak points of his semiology lay in its subjective and interpretative character, expressed by an imprecise and picturesque nomenclature.
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After having invented the stethoscope, Laennec published his treatise on auscultation in 1819, describing the acoustic events generated by ventilation and linking them with anatomopathological findings. The weak points of his semiology lay in its subjective and interpretative character, expressed by an imprecise and picturesque nomenclature.
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Classifying Respiratory Sounds with Different Feature Sets
2006 International Conference of the IEEE Engineering in Medicine and Biology Society, 2006In this study, different feature sets are used in conjunction with (k-nearest neighbors) k-NN and artificial neural network (ANN) classifiers to address the classification problem of respiratory sound signals. A comparison is made between the performances of k-NN and ANN classifiers with different feature sets derived from respiratory sound data ...
Yasemin P. Kahya +2 more
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Proposal of BSS method to separate the respiratory sound and the heart sound
2019 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), 2019Conventionally, there is a method to use auscultation when medical doctors diagnose a disease from heartbeats with heart noise. However, the respiratory sound and the heart sound are mixed. Further, it is difficult for the desired heart sound to be heard.
Yuki Kubota +2 more
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Classification of Sounds Indicative of Respiratory Diseases
2019This work presents a system achieving classification of respiratory sounds directly related to various diseases of the human respiratory system, such as asthma, COPD, and pneumonia. We designed a feature set based on wavelet packet analysis characterizing data coming from four sound classes, i.e. crack, wheeze, normal, crack+wheeze.
Stavros Ntalampiras, Ilyas Potamitis
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