Signal processing methods for PPG module to increase signal quality

Abstract

To estimate blood pressure with using pulse wave transit time method, the PPG and ECG signals have to be measured with high quality. This paper describes a device that improves PPG signal quality, with using different analogue and digital signal processing methods. The device is developed for the 24-hour ambulatory blood pressure monitoring system. Part of the device is designed in hardware and part of it is modelled in MATLAB. The experiments with PPG signal, noises and DC component drift included, have been carried out. As a result, the PPG signal quality has been improved with this device.