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This paper presents a new spectral envelope preprocessor based on sinusoid fitting and the discrete Fourier transform. This preprocessor is well-suited for nonintrusive condition monitoring and diagnostics due to its high noise resiliency and flexibility. It reduces data storage, transfer, and processing requirements by extracting only relevant harmonic signatures. This paper analyzes the resolution...
Today most news pages are generated from some underlying structured source, so we think that template-dependent wrappers should be more suitable for them than template-independent wrappers. In this paper, we propose a novel automatic template-dependent Web news content extraction approach based on similar pages. Firstly, We choose two similar pages as training samples and represent them as two HTML...
Phylogenetic footprinting is a method for the discovery of regulatory elements in a set of orthologous regions from multiple species, and reliable proteins classification is necessary for the identification of orthologous regions. There are two major grouping methods, i.e. classification and clustering, and classification needs prior-knowledge, while clustering bases on the sequence similarity. In...
This paper presents methodological advances on pulse measurement through thermal imaging of the face - a modality that recovers thermo-physiological function. Two previous methods that capitalized on heat transfer effects along and across the vessel during pulse propagation have been brought together in a fusion scheme. In addition, the quality of the extracted physiological signals has improved thanks...
The product shape innovation design has possessed a very important ability to develop more pleasurable products, in which Shape Descriptor is one of key technologies. A new describing method of product's shape based on complex coordinates and Fourier operator is presented, which includes the following five steps. The first is to pre-process, which can obtain the form contour information from product...
The maximum far field radiation of a power-ground plane pair is investigated, with varied choices of excitation position and spacing between the two planes, and thus giving a quantification guideline about where to place noise integrated circuits in the PCB layout design.
We describe an algorithm to accurately estimate the fundamental frequency of harmonic sinusoids in a mixed voice recording environment using an aligned electronic score as a guide. Taking the pitch tracking results on individual voices prior to mixing as ground truth, we are able estimate the pitch of individual voices in a 4-part piece to within 50 cents of the correct pitch more than 90% of the...
We will give necessary and sufficient conditions for {Xkn}kisinZopfn=1...N the samples taken at uniform rate from a w.s.s. processes (or of an ldquoobservedrdquo process) to form a frame or a Riesz basis of its span. In some way this is an analogue problem to that of finding conditions for frames of a shift invariant subspace of L2(Ropf) with a finite number of generators. We will give also related...
Variable speed drives are becoming the method of choice for powering AC motors in many industrial applications. They allow for flexible speed control, substantial energy savings, and reduced stress during motor start-up, all of which lead to lower lifecycle costs for the shaft line. Modern drives, in order to perform their controlling function, are equipped with sensors, hardware and software to measure...
We present a novel method to compute the normalized cross-correlation (NCC) of spherical signals such as omnidirectional images for the purpose of image alignment, i.e. orientation estimation, or template tracking. Expanding the reference image and the search template in the spherical harmonics basis, we use the Fourier representation of SO(3) as introduced by Kostelec and Rockmore. We show that the...
According to defects of former coal mine gas examination methods, it propose that using diode laser modulating technology and harmonic surveying technology to real-time remote sensing survey to coal mine methane. The second harmonic is selected by theory deduction to survey concentration of gas. This plan selects 2 v3 absorption band R6 branch absorption line of methane to survey the smallest detectable...
This paper proposes a Cross Spectral-Total Least Square (CS-TLS) method to measure the frequencies of the weak signal in colored noise, which clears the fake peaks caused by spectral estimation and overcomes efficiently. These false peaks are caused by the extended-order of the characteristic equation. Thus false peaks are hard to distinguish from the harmonic signal peaks in power spectrum curves...
In this paper the theoretical and experimental investigations of efficiency of known algorithms for directional fields constructing (by criterion of noise stability) are presented. An analysis carried out by us provides the conditions for exceeding the algorithm described in over the algorithm described in. It is shown, that this superiority is caused by principal features of a structure of algorithms...
This paper focuses on the amplitude estimation of a sine-wave harmonic component by the Interpolated Discrete Fourier Transform (IpDFT) method with maximum sidelobe decay windows. A constraint is derived ensuring that the influence of systematic errors due to the contribution from fundamental component on the amplitude estimation of a harmonic component can practically be neglected. This constraint...
A new algorithm is developed here for blind extraction of periodic signals. It is assumed that the fundamental frequencies of the sources (or alternatively one of the harmonics for each source) are known a priori. Necessary and sufficient conditions for blind source extraction of cyclostationary signals are introduced and the optimization problem is solved using steepest descent method for complex...
A new method based on improved multiple signal classification (MUSIC) algorithm and independent component analysis (ICA) method is applied in this paper. In contrast with the original MUSIC algorithm, the proposed version can give good performance at lower signal/noise ratio (SNR). After estimating the frequencies accurately, the amplitudes and phases of interharmonics are calculated with ICA method...
This paper introduces a new extended average magnitude difference function (EAMDF) for noise robust pitch detection. EAMDF involves in sufficient number of averaging for all lag values compared to the original AMDF, and thereby eliminates the falling tendency of the AMDF without emphasizing pitch harmonics at higher lags, which is a severe limitation of other existing improvements of the AMDF. A noise...
Precision in wavelength modulation spectroscopy measurements is quantified via Shannonpsilas information theory. The optimal harmonic detection order, yielding maximum information (in bits), is best obtained by quantitative considerations of the signal structure rather than those of conventional signal-to-noise ratios.
This paper shows the application of S-transform in identifying the voltage disturbances such as sag, interruption, swell and harmonics. S-transform is suitable for the analysis of power quality disturbances under noisy condition as it has excellent time-frequency resolution characteristics and has the ability to detect the disturbance correctly. Various voltage disturbances are generated as per IEEE...
In power systems the primary requirement is to find a rigorous approach to suppress the harmonics and ultimately extract the fundamental frequency component. The method presented enables the FIR filter design satisfying specific frequency characteristics with auxiliary constraints. The job of design is converted to an optimization problem with the constraint using standard mean square criterion. The...
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