Data compression of natural signals based on discrete wavelet transform analysis

Abstract

In this paper we explore the use of the discrete wavelet transform analysis of an arbitrary signal in order to improve the data compression capability of data coders. Wavelet analysis is widespread used in image codifiers, for example in JPEG2000. The wavelet compression methods are adequate for representing transients, such as percussion sounds in audio, or high-frequency components in two-dimensional images, for example an image of stars on a night sky. The wavelet analysis provides a subband decomposition of any arbitrary signal, and this enables a lossless or a lossy implementation with the same architecture. The signals could range from speech to sounds or music, but the approach is more orientated to other natural signals like arbitrary discrete series, EEG or ECG. Experimental results based on coefficients quantification, show a loss less compression of 2: I in all kind of signals, and lossy results preserving most of the signal waveform of about 5: I to 3: I.