This paper appeared in the proceedings of ICASSP'95 bases can approximate it with only a few non-zero coefficients. It then becomes necessary to adaptively se-ABSTRACT lect an appropriate "best basis" which provides the best We propose a Best Basis Algorithm for Signal Enhance-signal estimate by discarding (thresholding) the noisy ment in white gaussian noise. We base our search of coefficients...

This thesis focus on the theory analysis and algorithm aspects of signal subspace methods used for speech enhancement in digital speech processing The problem is approached by initially performing an analysis of subspace principles applied to speech signals in order to characterize the usefulness of de ning a signal subspace for this application The theory is formulated by means of the singular...

The enhanced generation of a spontaneous Raman signal by way of elastic scattering is demonstrated. Using Monte Carlo simulations, we show that elastic scattering, by increasing the path length of light through the medium, enhances the generation of a Raman signal. This is investigated over a large parameter space, demonstrating that this effect is robust, and providing additional physical insi...

Immunodetection methods such as immunohistochemistry and immunoblotting (Western blot analysis) are used to specifically and sensitively detect proteins of interest. In both immunohistochemical and immunoblotting techniques, a primary antibody binds to the protein of interest, and through the subsequent detection of this immunoglobulin with a conjugated secondary antibody, the presence of the p...

We report a femtosecond midinfrared study of the broadband low-energy response of individually separated (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed around 200 meV, whose transition energy, oscillator strength, resonant chirality enhancement, and dynamics manifest the observation of quasi-one-dimensional intraexcitonic transitions. A model of the n...

A global MHD simulation of an isolated substorm that occurred on March 9, 1995 is presented. The simulation, driven with solar wind data provided by the Wind satellite, reproduced to a surprising degree the evolution of substorm activity. The onset of the expansion phase was coincident with the penetration of an electric field spike into the nearEarth region. This impulse launched a tailward pr...

The acute onset of a unilateral choreiform movement disorder in a child with a recently documented febrile illness or streptococcal pharyngitis is suggestive of Sydenham chorea. The MR manifestations of two clinically corroborated cases of Sydenham chorea are summarized . Increased signal intensity in the corpus striatum contralateral to the patients ' symptomatic side was observed on T2-weight...

In this letter, we propose a novel speech enhancement algorithm based on data-driven residual gain estimation. The entire system consists of two stages. At the first stage, a conventional speech enhancement algorithm enhances the input signal while estimating several signalto-noise ratio (SNR)-related parameters. The residual gain, which is estimated by a data-driven method, is applied to furth...

Modelling Realized Variance when Returns are Serially Correlated by Roel C. A. Oomen* This article examines the impact of serial correlation in high frequency returns on the realized variance measure. In particular, it is shown that the realized variance measure yields a biased estimate of the conditional return variance when returns are serially correlated. Using 10 years of FTSE-100 minute by...