An Interference Suppression Method for Non-Contact Bioelectric Acquisition

Tang, Yue; Chang, Ronghui; Zhang, Limin; Yan, Feng

doi:10.3390/electronics9020293

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…Additionally, due to the limited computation power from the MCU, the moving average is less likely to interrupt continuous monitoring, which requires constant ADC operations and data analyses. In future work, we will explore other methods such as notch filter [23], Savitzky-Golay filter [24], or adapting the common-mode interference as reference signal [25] to find the best option in reducing the noise while preserving accurate ECG information under the hardware limitations.…”

Section: Ecg Measurementsmentioning

confidence: 99%

A Non-Contact Compact Portable ECG Monitoring System

et al. 2021

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Cardiovascular diseases (CVDs) have been listed among the most deadly diseases worldwide. Many CVDs are likely to manifest their symptoms some time prior to the onset of any adverse or catastrophic events, and early detection of cardiac abnormalities is incredibly important. However, traditional electrocardiography (ECG) monitoring systems face challenges with respect to their scalability and affordability as they require direct body contact and cumbersome equipment. As a step forward from the large-scale direct-contact ECG monitoring devices, which are inconvenient for the user in terms of wearability and portability, in this research, we present a small-sized, non-contact, real-time recording system for mobile long-term monitoring of ECG signals. The device mainly comprises three non-contact electrodes to sense the bio-potential signal, an AD8233 AFE IC to extract the ECG signal, and a CC2650 MCU to read, filter, and transmit them. The device is powered by a 2000 mAh lithium-ion battery with isolation between digital and analog powers on the board using two low-dropout regulators (LDOs). The board’s dimension is 8.56 cm × 5.4 cm, the size of a credit card, making it optimal to be worn in a shirt chest pocket. In spite of its small form factor, the device still manages to achieve a continuous measurement battery life of over 16 h, total harmonic distortion below −30 dB across the interested frequency range, an input-referred noise as low as 1.46 µV for contacted cases and 5.15 µV for non-contact cases through cotton, and clear ECG recording for both contact and non-contact sensing, all at a cost around USD 50.

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Section: Ecg Measurementsmentioning

confidence: 99%

A Non-Contact Compact Portable ECG Monitoring System

et al. 2021

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“…The detection electrodes are very susceptible to the power line common mode interference (CMI) and the body motion. Y. Tang propose a noise neutralization method by applying the reference electrode and a 50 Hz band-pass filter to obtain the interference of the human body and adapting the gains to neutralize the interference inputs of two acquisition electrodes and achieve the minimum interference output [ 15 ]. Meanwhile, an electrode-controllable humidification design using ultrasonic atomization is proposed to suppress motion artifacts [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

A High-Performance System for Weak ECG Real-Time Detection

Xu,

Yang,

et al. 2024

Sensors

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Wearable devices have been widely used for the home monitoring of physical activities and healthcare conditions, among which ambulatory electrocardiogram (ECG) stands out for the diagnostic cardiovascular information it contains. Continuous and unobtrusive sensing often requires the integration of wearable sensors to existing devices such as watches, armband, headphones, etc.; nonetheless, it is difficult to detect high-quality ECG due to the nature of low signal amplitude at these areas. In this paper, a high-performance system with multi-channel signal superposition for weak ECG real-time detection is proposed. Firstly, theoretical analysis and simulation is performed to demonstrate the effectiveness of this system design. The detection system, including electrode array, acquisition board, and the application (APP), is then developed and the electrical characteristics are measured. A common mode rejection ratio (CMRR) of up to 100 dB and input inferred voltage noise below 1 μV are realized. Finally, the technique is implemented in form of ear-worn and armband devices, achieving an SNR over 20 dB. Results are also compared with the simultaneous recording of standard lead I ECG. The correlation between the heart rates derived from experimental and standard signals is higher than 0.99, showing the feasibility of the proposed technique.

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“…Driven Right Leg (DRL) [24] and Capacitive Right Leg (CRL) [14] were presented as alternative ways to remove the common-mode noise. As compared with a capacitive driven right leg (C-DRL) counterpart, common-mode rejection ratio (CMRR) was significantly raised from 14.4 to 90.22 dB for an improved ECG signal quality, when there was an impedance mismatch between electrodes [25]. They designed this new method to replace the traditional C-DRL model, but our novel contribution is design new active electrodes to enhance raw signals, in order to increase the SNR.…”

Section: Introductionmentioning

confidence: 99%

Noise-Resistant CECG Using Novel Capacitive Electrodes

Chen

Hsieh

2020

Sensors

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For years, capacitive electrocardiogram (CECG) has been known to be susceptible to ambient interference. In light of this, a novel capacitive electrode was developed as an effective way to reduce the interference effect. This was done by simply introducing the capacitive elector in series with a 1 pF capacitor, and the 60 Hz common mode noise induced by AC power lines was cancelled using a capacitive right leg (CRL) circuit. The proposed electrode did as expected outperform two counterparts in terms of SNR, and particularly gave an up to 99.8% correlation between RRIs extracted from an ECG and a CECG signal, a figure far beyond 52% and 63% using the two counterparts. This capacitive electrode was originally designed for long-term noncontact monitoring of heart rate, and hopefully can be integrated to portable devices for other medical care services in the near future.

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An Interference Suppression Method for Non-Contact Bioelectric Acquisition

Cited by 7 publications

References 26 publications

A Non-Contact Compact Portable ECG Monitoring System

A Non-Contact Compact Portable ECG Monitoring System

A High-Performance System for Weak ECG Real-Time Detection

Noise-Resistant CECG Using Novel Capacitive Electrodes

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