نتایج جستجو برای: group delay
تعداد نتایج: 1098011 فیلتر نتایج به سال:
Abstract. Two main performance features of high-bandwidth switches are stability and delay. This paper investigates these performance features for input buffered switch architectures that deploy maximal weight matching algorithms to determine the configurations of the switching core. For this purpose, a novel mathematical model of the dynamics of a maximal weight matching algorithm is developed...
An e cient representation of short-time phase characteristics of speech sounds is proposed, based on recent ndings which suggest perceptual importance of phase characteristics. Subjective tests indicated that the synthesized speech sounds by the proposed method are indistinguishable from the original speech sounds with a moderate data compression. The proposed representation uses lower-order co...
In many applications, it is desirable to design filters that affect the magnitude of the Fourier transform of the input in some way – for example, by attenuating certain frequency components, while affecting the phase as little as possible. Unfortunately, for causal systems, it is not possible to achieve zero phase. Instead, as a design goal, we can try to make the phase as close to linear as p...
This paper quantifies the fundamental limits of variable-length transmission of a general (possibly analog) source over a memoryless channel with noiseless feedback, under a distortion constraint. We consider excess distortion, average distortion and guaranteed distortion (d-semifaithful codes). In contrast to the asymptotic fundamental limit, a general conclusion is that allowing variable-leng...
A number of previous studies have shown that speech sounds may have an intrinsic low dimensional structure. Such studies have focused on magnitude-based features ignoring phase information, as is the convention in many speech processing applications. In this paper dimensionality reduction methods are applied to MFCC and modified group delay function (MODGDF) features derived from the magnitude ...
This report is based on a survey of the literature on phase-delay artificial dielectrics to examine their suitability for multiple-beam antennas for satellite communications. The conclusions are that arrays of conducting discs appear to be suitable for such application because they can be used with circularly polarized fields and can be built with a desirable index of refraction, in the neighbo...
Unitary similarity transformations furnish a simple yet powerful vehicle for generating new classes of joint distributions based on concepts diierent from time, frequency, and scale. These new signal representations focus on the critical characteristics of large classes of signals and, hence, prove useful for representing and processing signals that are not well matched by current techniques. I...
The objective of this paper is to minimize the phase delay of the zero-order hold (ZOH) an usual sample-data hold device. In this paper an optimized data holding scheme whose phase delay is significantly less than of the ZOH is presented. The method is based on using optimal extrapolators, which has a better result than extrapolators proposed by Yekutiel (1980) and Belicynski and Kozinski (1984...
In this paper we review two OFDM based architectures, which have recently been proposed for optical long-haul transmission. The BER performance is investigated in presence of chromatic dispersion and differential group delay. In a further step both architectures are extended to polarization diversity receivers. Improvement is achieved by diversity combining at the expense of increased complexity.
We describe a method for generating a wide spectrum and at the same time improving propagation through a model inhomogeneous gaseous medium. The method is based on using a small two-photon detuning from a Raman resonance to adiabatically establish an appropriate molecular superposition state. This state, in turn, generates a broad spectrum of sidebands whose refractive index, Rayleigh scatter, ...
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