Mosiychuk V. "Multisignal direct digitising and processing of pulse wave parameters"

The dissertation is devoted to solving important scientific and technical problems of digital recording and processing parameters of biosignals and on this basis, the creation of multisignal systems of pulsometry. The problem was solved by developing a method of direct digitization of the primary amplitude-time parameters of biosignals, for which is used the charge method for measuring currents in an inversely - offset semiconductor conjunction of optoelectronic detectors. For this purpose on the basis of mathematical model of relaxation processes was explored mechanism of modulation the time constants of relaxation processes by measured physical quantity. Defined the conditions of a multisignal method of direct digitization. Through this mechanism disclosed synchronous recording of photoplethysmography and sphygmography pulse wave biosignals and generate additional reference signals of electrical and optical origin. Theoretical studies and propose technical solutions are implemented in the digital multisignal sensor device and pulsometry systems based on it. It is proposed registration algorithms and signal processing, according to which the initialization and registration of the time constants of relaxation processes are put on the processor sensor devices. Analyzed the computational resources and their distribution on the procedure of calculating the signal parameters and process of the direct digitizing. Offered also non resource-intensive algorithms of a digital processing of signals in a real time, in particular a high-frequency and low-frequency filtering, coding of data, and also calculation of parameters pulse wave biosignals. Practically received results allow to essentially raise efficiency of pulsometry systems.