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Data compression of electrocardiograms for long-time digital recording in IC memory
1Department of Electronic Engineering, Faculty of Engineering, Saitama University, Japan.
Frontiers of Medical and Biological Engineering : the International Journal of the Japan Society of Medical Electronics and Biological Engineering
|January 1, 1992
Summary
A new digital recorder uses data compression to store electrocardiograms (ECGs) for extended periods. This method offers superior accuracy and longer recording times compared to traditional analog tape recorders.
Area of Science:
- Biomedical Engineering
- Digital Health Technology
Background:
- Long-term electrocardiogram (ECG) monitoring is crucial for diagnosing cardiac conditions.
- Existing analog tape recorders have limitations in storage capacity and data fidelity.
Purpose of the Study:
- To develop a digital recorder for long-time ECG recording in integrated circuit (IC) memories.
- To evaluate the accuracy of ECG data reconstructed from compressed formats.
Main Methods:
- Utilized a variant of the Modified Step-Adaptive Predictive Algorithm (MSAPA) for data compression.
- Developed a digital recorder with an 8-bit CPU, real-time data compression, and a 200 Hz sampling rate.
- Compressed American Heart Association ECG samples to an average of 16.8% with a 30 microV error limit.
Main Results:
- Achieved an average maximum recording time of 8.5 hours in 1 Mbyte IC memories.
- Compressed 24 ECG samples to 16.8% of original size under specified error tolerances.
- Demonstrated superior reproduction accuracy and lower error rates compared to analog tape recorders.
Conclusions:
- The developed digital ECG recorder with MSAPA compression enables long-time monitoring.
- The digital system significantly outperforms analog recorders in terms of accuracy and efficiency.
- This technology facilitates more effective and reliable long-term cardiac data acquisition.