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In this paper we present a comparison of selected methods that are suitable for the spectral analysis of non-stationary signals. The first selected method is the Wavelet Transform (WT), often used in practical applications for analysing and pre-processing electrocardiograph signals (ECG). The second method is an adaptive modification of the widely-used Short-Time Fourier Transform (STFT). It achieves...
We introduce here the new Approximated Discrete Zolotarev Cosine Transform (ADZCT) which purpose is to improve the properties of the Discrete Cosine Transform (DCT) in the field of non-stationary signals. The paper presents the development of the ADZCT from the Discrete Zolotarev Cosine Transform (DZCT) step by step and deals with the issues that were met during the development. It is shown that the...
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