Annotation

Annotation: Problem Description. This article examines the use of wavelet analysis in studying periodic signals transmitted by low-speed communication devices. The relevance of this research is driven by the availability of sensors and devices connected via analog interfaces, including those using the HART (Highway Addressable Remote Transducer) protocol, on the Russian market. This article explores the development of a digital device using wavelet filters to process signals from low-speed analog data transmission protocols used in industrial automation devices. Objective. The objective of this work is to study the properties of orthogonal wavelet filters for directly reconstructing the vector diagram of the input signal of low-speed analog protocols. Key Results. The Morlet wavelet function was selected as the filter. It is necessary to determine the modulating window and bit depth that will ensure correct amplitude reconstruction for the frequencies used in the HART protocol. The approach was tested on an experimental setup based on a commercially available AD5700 HART modem. Processing was performed using a prototype program developed for studying the properties of wavelet functions. Practical Relevance. A software application was developed for modeling the characteristics of wavelet filters with varying coefficient bit depth, integration limits, and Morlet wavelet window function characteristics. Based on the modeling results, it is possible to design a digital FPGA-based HART modem with increased noise immunity.