ECG Signal Acquisition Circuit with Multi-Stage Amplification and Filtering
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Solution Overview
Problem
Mobile ECG detection systems are prone to inaccuracies due to environmental interference, affecting the reliability of disease diagnosis.
Innovation Solution
A method and device for acquiring ECG data that involves first-stage amplification, band-pass filtering within the frequency range of 0.1 Hz to 50 Hz, and second-stage amplification, followed by analog-to-digital conversion, with optional signal attenuation to counteract interference, ensuring accurate signal acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mobile ECG detection is carried out in daily life environment, then convenience and ease of operation are improved, but measurement precision deteriorates due to environmental interference
Solution Approach 1:
The signal processing is divided into multiple stages: first-stage amplification, band-pass filtering, second-stage amplification, and targeted 50 Hz interference attenuation. This segmented approach allows systematic removal of environmental interference while preserving ECG signal integrity, resolving the contradiction between mobile convenience and measurement accuracy.
Solution Approach 2:
The patent applies frequency-selective parameter changes by attenuating signals at specific interference frequencies (particularly 50 Hz) while preserving the ECG signal bandwidth (0.1-50 Hz). This selective parameter modification eliminates environmental noise without sacrificing ECG measurement precision, enabling accurate mobile ECG detection.
2Measurement precision
If signal amplification is performed to enhance weak ECG signals, then measurement precision is improved, but harmful factors worsen due to amplified environmental interference
Solution Approach 1:
Band-pass filtering is performed before the second-stage amplification to pre-remove interference components. This preliminary action ensures that subsequent amplification enhances only the ECG signal within the desired frequency range, preventing interference from being amplified along with the signal.
Solution Approach 2:
The patent converts the harmful 50 Hz environmental interference into a identifiable target for selective attenuation. By recognizing the characteristic frequency of power-line interference, the system applies targeted attenuation at 50 Hz, transforming a harmful factor into a controllable parameter that can be selectively removed while preserving the ECG signal.
3Reliability
If band-pass filtering is applied to remove interference, then reliability is improved, but loss of information occurs due to potential removal of useful signal components
Solution Approach 1:
The patent applies filtering with locally optimized characteristics tailored to ECG signal properties. The band-pass filter is configured with specific frequency boundaries (0.1-50 Hz) that match the known spectral content of ECG signals, ensuring that useful information is preserved while interference is removed. This localized filtering approach maximizes reliability without causing information loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed method and device significantly improve the accuracy of ECG data by filtering out unwanted frequencies and amplifying signals within the relevant range, resulting in more reliable heart signal detection.
Implementation Method 1
performing band-pass filtering process within a first frequency range on the ECG signals on which the first-stage amplification has been performed, the first frequency range being 0.1 Hz to 50 Hz
Implementation Method 2
performing a first-stage amplification on the ECG signals, a multiple of the first-stage amplification including 5 to 10 times
Implementation Method 3
performing analog-to-digital conversion on the ECG signals on which the second-stage amplification has been performed, to generate ECG digital signals
Implementation Method 4
performing signal attenuation whose attenuation range is −35 dB to −45 dB on an ECG signal corresponding to 50 Hz among the ECG signals on which the band-pass filtering process has been performed
Data Source
AI summary
Embodiments of the present application provide a method and a device for acquiring ECG data, and an ECG detection system. A method for acquiring ECG data, comprising: acquiring ECG signals of heart; performing a first-stage amplification on the ECG signals, a multiple of the first-stage amplification including 5 to 10 times; performing band-pass filtering process within a first frequency range on the ECG signals on which the first-stage amplification has been performed, the first frequency range being 0.1 Hz to 50 Hz; performing a second-stage amplification on the ECG signals on which the band-pass filtering process has been performed, a multiple of the second-stage amplification including 40 to 50 times; performing analog-to-digital conversion on the ECG signals on which the second-stage amplification has been performed, to generate ECG digital signals; and outputting the ECG digital signals.