New PDF release: Biomedical Signals and Sensors II: Linking Acoustic and

By Eugenijus Kaniusas

ISBN-10: 3662451050

ISBN-13: 9783662451052

ISBN-10: 3662451069

ISBN-13: 9783662451069

The ebook set develops a bridge among physiologic mechanisms and diagnostic human engineering. whereas the 1st quantity is targeted at the interface among physiologic mechanisms and the ensuing biosignals, this moment quantity is dedicated to the interface among biosignals and biomedical sensors. that's, within the first quantity, the physiologic mechanisms picking biosignals are defined from the fundamental mobile point as much as their complex mutual coordination point. This moment quantity, considers the genesis of acoustic and optic biosignals and the linked sensing expertise from a strategic viewpoint. As a novelty, this booklet discusses heterogeneous biosignals inside a standard body. This body contains either the biosignal formation pathfrom the biosignal resource on the physiological point to biosignal propagation within the physique, and the biosignal sensing direction from the biosignal transmission within the sensor utilized at the physique as much as its conversion to a, often electrical, signal.

Some biosignals come up throughout the body’s important features whereas others map those features that express physiological facts to an observer. it's hugely instructive how sound and lightweight beams have interaction with organic tissues, yielding acoustic and optic biosignals, respectively. mentioned phenomena train much concerning the physics of sound and physics of sunshine (as engineering sciences), and, nonetheless, biology and body structure (as stay sciences). The hugely interdisciplinary nature of biosignals and biomedical sensors is clearly a problem. despite the fact that, it's a worthwhile problem after it's been coped with in a strategic method, as provided right here. The booklet is meant to have the presence to respond to interesting “Aha!” questions.

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Extra info for Biomedical Signals and Sensors II: Linking Acoustic and Optic Biosignals and Biomedical Sensors

Sample text

However, the noisy respiration during sleep, as actually the snoring corresponds to, can not be used as a sole indicator of breathing abnormalities, such as sleep apnea (Wilson et al. 1999). Likewise, snoring lacks specificity for diagnosis of apneas. 1 Formation Aspects 29 450 Hz and another one at around 1 kHz; both peaks probably raised by filtering and modification of the noise in the airway. The latter bursts of sound—superimposed on the noise—also indicate additional sound sources other than air turbulences (turbulent mechanisms), such as intermittent opening and closing of the airway (vocal mechanisms), all sources contributing to the first postapneic snore.

B) The corresponding spectrogram with indicated respiratory rate fR. For parameters of the spectrogram see Footnote 4 corresponding body sounds—in terms of the sound’s formation in the electrical circuit model, see Fig. 2—are tightly related to each other. On the other hand, mutual interrelations among body sounds originating from respiratory activity only, such as lung, snoring, and apneic sounds, also exist because all these sounds have the same origin—the respiration. 17 illustrates the latter relationships of sources of the different body sounds.

1) exhibit various mutual interrelations. Likewise, sources of the 30 4 Sensing by Acoustic Biosignals (a) Sensor location 1/ fC sPCG (rel. units) OSA 2 0 -2 (dB) f (Hz) OS Apneic respiratory efforts OS 1500 OS OS 1000 OS 50 0 1/fR 500 -50 0 0 10 20 30 40 50 t (s) (b) sPCG (rel. 5 -1 (dB) f (Hz) 50 1500 OS OS OS 0 1000 500 -50 0 0 5 10 15 20 25 t (s) (c) sPCG (rel. 1 Formation Aspects 31 JFig. 15 Apneic sounds during sleep, as illustrated by an acoustic biosignal phonocardiogram sPCG from the chest region of sleep apnea patients.

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Biomedical Signals and Sensors II: Linking Acoustic and Optic Biosignals and Biomedical Sensors by Eugenijus Kaniusas

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