This article presents some new results concerning recursive filters design with approximately linear phase and Chebyshev stopband attenuation. The denominator polynomial D(z) of the transfer function H(z)=N(zJ/D(z) is used to obtain a maximally flat behavior for the delay in the passband, whereas N(t) describes equiripple amplitude in the stopband. The approach under consideration is based on z...

A method of signal waveform estimation from an ensemble of jittered noisy measurements is presented. The method uses group delay functions to perform the ensemble averaging and thus overcomes the difficulty of computing the unwrapped phase function before averaging. We propose a new technique, called group delay processing, to estimate the signal waveform if only a single noisy measurement is a...

This paper proposes a technique for prosodic (pitch and duration) manipulation using instants of significant excitation. Instants of significant excitation correspond to the instants of glottal closure (epochs) in voiced speech and to some random excitations like burst onset in the case of nonvoiced speech. Instants of significant excitation are computed from the average group delay of minimum ...

For the sake of achieving remarkable superprism effect, we investigate in thin film Fabry-Perot filter which possess drastic change in phase and large group delay around wavelength of peak transmittance. The group delay and spatial dispersion shift are simulated numerically; while the device is fabricated and tested with the maximum spatial separation shift reach to 65μm. We also analyze Gaussi...

—A distribution highly concentrated along the group delay or the instantaneous frequency (IF) is presented. It has been defined by introducing signal with a complex argument in time–frequency (TF) analysis. Realization of a signal with complex argument, using signal with a real argument, is described. The reduced interference realization of the complex argument distribution, in the case of mult...

We propose methods to track natural variations in the characteristics of the vocal-tract system from speech signals. We are especially interested in the cases where these characteristics vary over time, as happens in dynamic sounds such as consonant-vowel transitions. We show that the selection of appropriate analysis segments is crucial in these methods, and we propose a selection based on est...

An optimized fundamental frequency (F0) trajectory extraction method, which alleviates systematic F0 glitches at vowelnasal boundaries and in the vicinity of consonants, is introduced. The proposed method employes minimum phase group delay compensation for apparent F0 modulations due to variations in their corresponding vocal tract transfer functions. This method can also be considered as an im...

Group delay functions provide an alternative representation of signal information. The main features of group delay functions are the additive and high resolution properties. The Fourier transform (FT) phase is generally featureless due to random polority and wrapping. But the group delay function which is de ned as the negative derivative of phase, can be processed to derive signi cant informa...

Cochlear implant speech processors seek to generate a neural response that mimics normal hearing. However, the cochlear phase response is generally discarded, together with other fine scale temporal aspects of sound. We sought to incorporate and compare a variety of cochlear traveling wave delays (i.e. group delays) in a clinical speech processing strategy. Traveling wave delays resulted in a s...

In this paper, the concept of instantaneous parameters, which has previously been associated exclusively with 1-D measures like the instantaneous frequency and the group delay, are extended to the 2-D time-frequency plane. Such generalized instantaneous parameters are associated with the shorttime Fourier transform. They may also be interpreted as local moments of certain time-frequency distrib...