This paper explains a study conducted based on wavelet based transform techniques. We have used discrete wavelet transform and wavelet packet decomposition. The database is created by using Malayalam (one of the south Indian Languages) language spoken words. Daubechies type of mother wavelet was used for the experiment. Six hundred and forty samples are collected, for the experiment. The featur...

Une base orthonormale de L 2 (R), dont les el ements sont bien localis es dans l'espace de phase et leurs supports adapt es a toute partition sym etrique de l'espace des fr equences, s erie I, C. R. A modiied Haar system and higher order spline systems on R n as unconditional bases for Hardy spaces, Conference inharmonic analysis in honor of Antoni Zygmund II, W. Beckner et al.

Since two decades, wavelet packet decompositions have been shown effective as a generic approach to feature extraction from time series and images for the prediction of a target variable. Redundancies exist between the wavelet coefficients and between the energy features that are derived from the wavelet coefficients. We assess these redundancies in wavelet packet decompositions by means of the...

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 work, a shifted wavelet packet (SWP) library, containing all the time shifted wavelet packet bases, is deened. A corresponding shift-invariant wavelet packet decomposition (SIWPD) search algorithm for a \best basis" is introduced. The search algorithm is representable by a binary tree, in which a node symbolizes an appropriate subspace of the original signal. We prove that the resultant...

Parameterized wavelet filters and wavelet packet subband structures are discussed to be used as key dependent wavelet transforms in order to enhance the security of wavelet based hashing schemes. Experiments show that key dependency and keyspace of the hashing scheme considered have been significantly improved. The attack resistance could only be slightly enhanced by using parametrized wavelet ...

The continuous wavelet transform is employed to analyze the dynamics and time-dependent energy distribution of phonon wave-packet propagation and scattering in molecular dynamics simulations. The equations of the one-dimensional continuous wavelet transform are presented and then discretized for implementation. Practical aspects and limitations of the transform are discussed, with attention to ...

We present a technique for lossy image compression based on the joint-adaptive space and frequency decomposition of images. The algorithm adapts to image content by both developing wavelet packet bases for separate areas of the image and by segmenting image subbands as needed. The elements of the expansion are a two-channel lter bank and a complete and disjoint binary segmentation system. We co...