Development of a real-time adaptive delta compression algorithm for photoplethysmography system

Kim Soon Chong, Gan Kok Beng, Edmond Zahedi

Research output: Contribution to journalArticle

Abstract

Photoplethysmography (PPG) is a simple and low-cost optical technique that measures the blood volume change of the microvascular bed. The multichannel PPG recording system enables researchers to study the characteristics of the PPG signal from multiple body sites. Long-time, continuous PPG signal monitoring helps doctors in medical diagnosis and treatment. However, the development of the PPG signal acquisition system is limited by storage capacity and computational and hardware capability. Limitation in storage capacity and communication efficiency can be addressed by introducing data compression algorithms. In this paper, a single-channel, high-resolution (24-bit) wireless PPG data acquisition system using Bluetooth connectivity with the adaptive delta compression algorithm is presented. A graphical user interface was developed using MATLAB to interface with the system using a serial port profile. The PPG signals were decompressed and stored in the local hard drive for future analysis. The performance of adaptive data compression algorithm was evaluated with 12 healthy subjects. Results show that the compression ratio achieved is 41.5. The mean percentile root-mean-square (RMS) difference at the sampling frequency of 100Hz is 0.13%. The mean normalized percentile RMS difference value is 9.78%. The system was successfully tested in a continuous acquisition mode for up to 60min.

Original languageEnglish
JournalIEEJ Transactions on Electrical and Electronic Engineering
DOIs
Publication statusAccepted/In press - 1 Jan 2018

Fingerprint

Photoplethysmography
Data compression
Bluetooth
Graphical user interfaces
MATLAB
Interfaces (computer)
Data acquisition
Blood
Sampling
Hardware
Monitoring
Communication

Keywords

  • Adaptive delta data compression
  • Bluetooth
  • Photoplethysmograph (PPG)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

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abstract = "Photoplethysmography (PPG) is a simple and low-cost optical technique that measures the blood volume change of the microvascular bed. The multichannel PPG recording system enables researchers to study the characteristics of the PPG signal from multiple body sites. Long-time, continuous PPG signal monitoring helps doctors in medical diagnosis and treatment. However, the development of the PPG signal acquisition system is limited by storage capacity and computational and hardware capability. Limitation in storage capacity and communication efficiency can be addressed by introducing data compression algorithms. In this paper, a single-channel, high-resolution (24-bit) wireless PPG data acquisition system using Bluetooth connectivity with the adaptive delta compression algorithm is presented. A graphical user interface was developed using MATLAB to interface with the system using a serial port profile. The PPG signals were decompressed and stored in the local hard drive for future analysis. The performance of adaptive data compression algorithm was evaluated with 12 healthy subjects. Results show that the compression ratio achieved is 41.5. The mean percentile root-mean-square (RMS) difference at the sampling frequency of 100Hz is 0.13{\%}. The mean normalized percentile RMS difference value is 9.78{\%}. The system was successfully tested in a continuous acquisition mode for up to 60min.",
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