In this paper we intend to optimize a wavelet-based dictionary for transient modelling with application to parametric audio coding. Transient modelling is performed by matching pursuit with an overcomplete dictionary composed of orthonormal wavelet functions that implement a wavelet-packet filter bank. We try to find the prototype filter length, the decomposition depth and the orthogonal wavele...

In this paper the wavelet packet transform is used for processing of rolling element bearing fault signals. The effectiveness of the envelope analysis technique is combined with the flexibility of the wavelet packet transform, helping in the minimization of interventions by the end user. According to the proposed method, a time-frequency decomposition of a vibration signal is provided and the c...

In this article a texture feature extrac tion scheme based on M band wavelet packet frames is investigated The features so extracted are used for segmentation of satellite images which usually have complex and overlapping boundaries The underly ing principle is based on the fact that di erent im age regions exhibit di erent textures Since most signi cant information of a texture often lies in t...

This paper deals with frequency offset estimation in OFDM systems. The proposed approach is based on adapted wavelet packet decomposition of the shifted received signal. The binary tree is optimized, in iterative manner, according to a comparison between decomposed signals energy. The proposed approach is characterized by small number of iterations, short wavelet packet filters and robustness a...

In this paper, an algorithm for wavelet packet trees that can systematically identify all bit allocations/best-basis selections on the lower convex hull of the rate-distortion curve is presented. The algorithm is applied to tree-structured vector quantizers used to code image subbands that result from the wavelet packet decomposition. This method is compared to optimal bit allocation for the di...

The research aimed to introduce newly designed features for speech signal. The newly developed features are designed to normalize the dynamic structure of best tree decomposition of wavelet packets. The 4 points encoded vector is a full of information just like the original best tree’s structure. It is a loss less encoding system that grantees 100% reconstruction of the original best tree. The ...