A scalable lumped element equivalent circuit of a pre-matched, multifinger FET cell is proposed. The model is derived using a global modeling approach that exploits both circuit and full wave analysis, accounting for phase delay along gate and drain manifolds. The availability of such model is useful to perform fast performance analysis and optimization of the pre-matching network.

Phase processing has been replaced by group delay processing for the extraction of source and system parameters from speech. Group delay functions are ill-behaved when the transfer function has zeros that are close to unit circle in the z-domain. The modified group delay function addresses this problem and has been successfully used for formant and monopitch estimation. In this paper, modified ...

In this paper, using an inverse scattering approach, we describe how the selection of mode effective indices and thus phase velocities can be used to control group velocity in a waveguide. As such it is shown that differential group delay can be equalised or minimised over a wavelength of choice. A particular feature of the new designs is the development of rings and a peaked core which may spl...

A highly accurate client-independent geolocation service stands to be an important goal for the Internet. Despite an extensive research effort and significant advances in this area, this goal has not yet been met. Motivated by the fact that the best results to date are achieved by utilizing additional ’hints’ beyond inherently inaccurate delay-based measurements, we propose a novel geolocation ...

In this paper, a new method of estimation of the magnitude square coherence function (MSC) by an ARMA model is proposed. The estimation is achieved by modeling the periodogram estimate of the MSC and the ARMA model has been realized by the pole-zero decomposition property of the group delay function (GDF). Its performance has been found to be superior to that of the periodogram MSC estimate in ...

After presenting results of recent impulse-noise measurements in customer premises, a proposal for a simplified statistical model for impulse noise is presented. The new model is intended to replace the deterministic single impulse, widely known as Cook Pulse, especially in the upcoming standards for SDSL and also maybe VDSL. In addition to the statistical model also herein, sample impulses are...

This paper presents a singing recording system, VocaRefiner, that enables a singer to make a better singing recording by integrating multiple recordings of a song he or she has sung repeatedly. It features a function called clickable lyrics, with which the singer can click a word in the displayed lyrics to start recording from that word. Clickable lyrics facilitate efficient multiple recordings...

In this paper we will argue that the superposition of waves can be calculated in a simple way. We show, using the Gauss’s method to sum an arithmetic sequence, how it is possible to construct the superposition of waves with different frequencies in a simple conceptual way. By this method we arrive to the usual result where we can express the superposition of waves as the product of factors, one...

Automatic Speaker Verification (ASV) systems are prone to spoofing attacks of various kinds. In this study, we explore the effects of different features and spoofing algorithms on a state-of-the-art i-vector speaker verification system. Our study is based on the standard dataset and evaluation protocols released as part of the ASVspoof 2015 challenge. We compare how different features perform w...

We systematically study the pulse advance and pulse compression in light propagation through a transparent, anomalously dispersive medium. Using an Argand diagram, we show that pulse compression is the only form of pulse distortion, while other forms of pulse distortion can be eliminated. Experimentally, we implement a dual-band electronic amplifier to measure the negative pulse group delay and...