The large group delay of the high order FIR filters is unacceptable in some applications. So, recently, how to reduce the group delay of FIR filters has been studied intensively. To reduce the ringing in the time domain and to maximize the stopband attenuation, it is useful to design FIR filters with maximally flat characteristics in the passband and transmission zeros in the stopband. We prese...

S U M M A R Y We derive both 3-D and 2-D Fréchet sensitivity kernels for surface-wave group-delay and anelastic attenuation measurements. A finite-frequency group-delay exhibits 2-D off-ray sensitivity either to the local phase-velocity perturbation δc/c or to its dispersion ω(∂/∂ω)(δc/c) as well as to the local group-velocity perturbation δC/C . This dual dependence makes the raytheoretical in...

The dInSAR phase signal is a superposition of different contributions. When studying geophysical processes, we are usually only interested in the surface deformation part of the signal, and therefore, to obtain high quality results, we would like to remove other phase components. Although several ways of estimating the tropospheric phase delay contribution have already been described in the lit...

Canal-Corretger, M. M., T. Cambras, J. Vilaplana, and A. Dı́ez-Noguera. Bright light during lactation alters the functioning of the circadian system of adult rats. Am. J. Physiol. Regulatory Integrative Comp. Physiol. 278: R201– R208, 2000.—To examine the role of light in the maturation of the circadian pacemaker, twelve groups of rats were raised in different conditions of exposure to constant ...

Intermediate-focus earthquakes are known to show features such as nondouble-couple focal mechanisms that indicate source complexities. To characterize these features, we have systematically studied the low-frequency radiation from 108 intermediate-focus earthquakes recorded by high-performance seismic networks from 1989–1997 whose total moment was 3 10 N m. We determined frequency-dependent foc...

Recently, there has been an increased interest in the use of the time-delay estimation (TDE) technique to locate and track acoustic sources in a reverberant environment. Typically, the delay estimate is obtained through identifying the extremumof the generalized cross-correlation (GCC) function or the average magnitude difference function (AMDF). These estimators are well studied and their stat...

New text independent speaker identification method is presented. Phase spectrum of allpole linear prediction (LP) model is used to derive the speech features. The features are represented by pairs of numbers that are calculated from group delay extremums of LP model spectrum. The first component of the pair is an argument of maximum of group delay of all pole LP model spectrum and the second is...

This paper presents a technique to obtain a realization for passive ladder networks of the Inverse-Chebyshev lowpass filter with all positive elements. The technique consists in the shifting of transmission zeros to infinity by means of a transformation in the complex frelquency s-plane. The technique allows for multiple frequency shifts until the desired realization is obtained. Results show t...

The chirp of single-cycle microwave fields after interaction with pairs of parallel diffraction gratings is measured in a phase-sensitive terahertz spectrometer. Novel transmission grating pairs recently proposed by Tournois, which combine diffraction and refraction effects, yield an almost linear group delay over a bandwidth that exceeds that of conventional reflection gratings by a factor of ...

The relevance of our definition for sensitivity in refractometric sensing, being the relative change of the transmittance of a certain output channel of an optical device over the change of the refractive index of the probed material, is discussed. It is compared to one based on spectral shift per refractive index unit change. Further, it is discussed how group delay and sensitivity are interre...