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The proposed article introduces a design of smart bed sheet for contactless electrocardiogram (ECG) measurement. As a sensor part, active capacitively coupled textile electrodes sewn into the bed sheet were designed. A measuring part represents a developed control unit for data preprocessing and acquisition utilizing the ADS1198 front-end chip. Design and implementation of the sensor part as well as measuring part are discussed in detail. A pilot prototype was fabricated to evaluate the feasibility of the design and reliability of contactless ECG measurement. The present prototype appears promising for application to bedding as an unconstrained method for ECG monitoring.

The presented article details the design and evaluation of specific algorithms used for pulse wave velocity estimation. We chose to analyze both the ECG and PPG signals in order to estimate the time delay between the time when the blood is ejected into the aorta and the time when the pulse wave arrives to the point where the PPG probe is placed. Algorithms for the detection of R-waves in ECG signal and detection of slope beginnings in PPG signal were used.

This article describes a four-channel amplifier for human neurophysiologic electrical activity measurement. The advantage of the device, in combination with the developed software, lies in the real-time display of various human electrical signals such as ECG, EEG and EOG. Signal samples are stored in a binary file on the hard drive for further analysis. Combination of leads is changeable depending on the measurement type and characteristics thereof. Gain of individual leads is adjustable by digital potentiometers. The various types of measurement are presented in the article in order to verify device function.

The article deals with the accelerometer and gyroscope measurements and gravity vector components compensation. A part of work involves also design and realization of device serving for acceleration and angle rotation measurement. Within the work algorithm for gravity compensation was tested.