By Subhasis Chaudhuri
Ambulation research in Wearable ECG
Subhasis Chaudhuri, Tanmay Pawar, Siddhartha Duttagupta
Ambulation research in Wearable ECG demonstrates why, as a result of fresh advancements, the wearable ECG recorder substantiates an important innovation within the healthcare field.
About this book:
Examines the viability of wearable ECG in cardiac monitoring
Includes chapters written through practitioners who've individually constructed such to jot down concerning the details
Bridges the space among and algorithmic advancements with chapters that in particular speak about the features and their corresponding calibration issues
Presents an invaluable textual content for either practitioners and researchers in biomedical engineering and comparable interdisciplinary fields
Assumes uncomplicated familiarity with electronic sign processing and linear algebra
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Extra resources for Ambulation Analysis in Wearable ECG
One of the common ways of attenuating the common mode noise is to drive the right leg using a common mode negative feedback circuit as shown in Fig. 4. Right leg drive circuit is also used in bedside electrocardiograph systems . 4 Signal Conditioning 33 Fig. 4. Right leg drive circuit(Used with permission from Biosemi Inc. ) For further amplification and filtering of ECG signals more often INA is followed by a LPF (lowpass filter). This lowpass filter is an active filter made by on-chip opamps or OTAs (operational transconductance amplifiers) and discrete resistors and capacitors.
50/60Hz interference signal on the body is converted into a small differential voltage due to this mismatch. This differential voltage appears at the input of ECG lead, which in turn is amplified and appears as noise on the ECG signal at the output of ECG channel. Fig. 1 under strong 50Hz interference but with proper shielding. Similar ECG was then recorded without shielding considerations to demonstrate the effect of mains supply interference on the ECG signal as shown in Fig. 8(b). Mains supply interference cannot be easily filtered from ECG because its frequency is in the band of ECG signal.
In return common mode voltage of the ECG instrument changes with frequency of 50Hz (or 60Hz), which appears as common mode noise on the reference level of ECG signal. Therefore INAs with high CMRR (more than 90dB) are required. In addition to common mode noise there is possibility of differential mode noise as well. This is due to the inherent mismatch between impedance of ECG electrode skin interface for every two electrodes. 50/60Hz interference signal on the body is converted into a small differential voltage due to this mismatch.