Advances in Photoplethysmogram and Electrocardiogram Signal Analysis for Wearable Applications G. R. Ashisha and X. Anitha Mary Abstract Photoplethysmography (PPG) is a simple and noninvasive optical method for monitoring people’s physiological parameters like oxygen level of blood, pulse rate, heart rate, respiratory rate, blood pressure, blood viscosity, etc. PPG is an optical technique that uses a pulse oximeter to take the measurements. Most of the pulse oximeter has light-emitting diodes (LED’s) and photodetector placed at the upper- most layer of the skin to obtain the variation of blood volume in the microvessels of a body. The electrocardiogram (ECG) is the method that shows the action of the heart, and it helps to diagnose any heart-related diseases. Analysis of the PPG signal and ECG signal will help the researchers and doctors to detect various cardiovascular diseases. Measuring the physiological parameters is very essential for people with old age, a woman in pregnancy, and all patients with any other serious situations. PPG technology is becoming familiar because of its easy access, portability, and low cost. Technological development in digital sensors, mobiles, wearable devices, and wireless transmission makes continuous and real-time monitoring feasible. This paper aims to show the present improvements and difficulties of ECG and PPG based monitoring systems. Keywords Photoplethysmogram · Electrocardiogram · Noninvasive · Wearable devices 1 Introduction Wearable medical care devices are one of the quickest developing markets of this decennary due to the enormous demand to track elderly population and long-term illness. Scientists from unrelated technology of science are becoming interested and G. R. Ashisha (B ) · X. Anitha Mary Instrumentation Engineering, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, India e-mail: grashisha27@gmail.com X. Anitha Mary e-mail: anithamary@karunya.edu © Springer Nature Singapore Pte Ltd. 2021 J. D. Peter et al. (eds.), Intelligence in Big Data Technologies—Beyond the Hype, Advances in Intelligent Systems and Computing 1167, https://doi.org/10.1007/978-981-15-5285-4_52 527