A novel method to represent ECG signals via predefined personalized signature and envelope functions

Abstract

In this paper, a new method to model ECG signals by means of Predefined Personalized Signature and Envelope Functions is presented. ECG signals are somewhat unique to a person. Moreover, it presents quasi-stationary behavior. Therefore in this work, on a frame basis, personal ECG signals X/sub i/(t) is modeled by the form of X/sub i/(t)/spl ap/C/sub i//spl phi//sub i/(t) /spl alpha//sub i/(t). In this model, /spl phi//sub i/(t) is defined as the Personalized Signature Function (PSF); /spl alpha//sub i/(t) is referred to as Personalized Envelope Function (PEF) and C/sub i/ is called the Frame-Scaling Coefficient (FSC). It has been demonstrated that for each person, the sets /spl Phi/={/spl phi//sub k/(t)} and A={/spl alpha//sub r/(t)} constitute a Predefined Personalized Functional Bases or Banks (PPFB) to describe any measured ECG signal. Almost optimum forms of (PPFB), namely {/spl alpha//sub r/(t)}, {/spl phi//sub k/(t)} pairs are generated in the Least Mean Square (LMS) sense. Thus, ECG signal for each frame is described in terms of the two indices R and K of PPFB and the frame-scaling coefficient Ci. It has been shown that the new method of modeling provides significant data compression. Furthermore, once PPFB are stored on each communication node, transmission of ECG signals reduces to the transmission of indexes R and K of [/spl alpha//sub r/(t), /spl phi//sub k/(t)] pairs and the coefficients C/sub i/, which also result in considerable saving in the transmission band.