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Related Concept Videos

Pulse Oximetry01:24

Pulse Oximetry

1.4K
Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
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Passive Filters01:27

Passive Filters

1.0K
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
2.1K
Pulse01:05

Pulse

3.8K
The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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Fetal Circulation01:14

Fetal Circulation

3.0K
Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
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Related Experiment Video

Updated: Feb 2, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Signal Separation for Transabdominal Non-invasive Fetal Pulse Oximetry using Comb Filters.

Marcel Bottrich, Peter Husar

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |November 17, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Comb filters effectively separate fetal and maternal signals in non-invasive fetal pulse oximetry. This method allows for accurate fetal oxygen level estimation from abdominal photoplethysmogram (PPG) data.

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    Area of Science:

    • Biomedical Engineering
    • Signal Processing

    Background:

    • Non-invasive fetal pulse oximetry aims to monitor unborn child oxygen levels.
    • Maternal and fetal photoplethysmogram (PPG) signals are mixed, complicating analysis.
    • A pure fetal PPG is essential for accurate oxygen saturation estimation.

    Purpose of the Study:

    • To apply comb filters for separating fetal and maternal PPG signals.
    • To evaluate the efficacy of comb filtering in non-invasive fetal pulse oximetry.

    Main Methods:

    • Utilized finite element simulations and phantom measurements.
    • Generated synthetic PPG signals with varying heart rates and noise levels.
    • Applied comb filters tuned to fetal heart rates to mixed PPG signals.

    Main Results:

    • Comb filters successfully extracted fetal PPG signals, even with an 80 dB magnitude difference.
    • The resulting fetal signal quality is adequate for beat-to-beat analysis.
    • Signal separation proved effective across different simulated conditions.

    Conclusions:

    • Comb filtering is a viable signal separation technique for non-invasive fetal pulse oximetry.
    • This method facilitates reliable fetal oxygen level monitoring.