نتایج جستجو برای: frequency domain decomposition
تعداد نتایج: 944247 فیلتر نتایج به سال:
Spatial aliasing is an unwanted side effect that produces artifacts during seismic data processing, imaging and interpolation. It is often caused by insufficient spatial sampling of seismic data and often happens in CMP (Common Mid-Point) gather. To tackle this artifact, several techniques have been developed in time-space domain as well as frequency domain such as frequency-wavenumber, frequen...
This paper describes employment of non-uniform QMF decomposition to increase the efficiency of a generic wide-band audio coding system based on Frequency Domain Linear Prediction (FDLP). The base line FDLP codec, operating at high bit-rates (∼136 kbps), exploits a uniform QMF decomposition into 64 sub-bands followed by sub-band processing based on FDLP. Here, we propose a non-uniform QMF decomp...
Efficient macromodeling techniques used to model multi-port distributed systems using tabulated data are presented. First a method to macromodel large multiport systems characterized by noisy frequency domain data is shown. The proposed method is based on the vector fitting algorithm and uses an instrumental variable approach and QR decomposition to formulate the least squares equations. The in...
Purpose: The aim of this study was to characterize prolonged standing and its effect on postural control in elderly individuals in comparison to adults.Materials and Methods: The elderly individuals’ behavior during standing and how demanding such a task is for them, is still unknown. We recorded the center of pressure (COP) position of 12 elder and 15 young participants while they were standin...
It is of great significance to detect drones in airspace due the substantial increase and regrettable misuse consumer market. In this paper, we establish a micro-motion theoretical model drone analyze micro-Doppler signature rotor targets flicker mechanisms multi-rotor targets. Hence, for target recognition problem drones, parameter estimation method proposed. Firstly, signal frequency domain s...
This article investigates the influence of four causal frequency-dependent (FD) soil models and their impact on responses a multiphase overhead transmission line (OHTL) with ground wires, generated by lightning strike. The FD proposed Longmire-Smith (LS), Messier (M), Portela (P) Alípio-Visacro (AV) are considered. ground-return impedance admittance matrices computed Nagakawa approach for both ...
Time-frequency filtering is an acceptable technique for attenuating noise in 2-D (time-space) and 3-D (time-space-space) reflection seismic data. The common approach for this purpose is transforming each seismic signal from 1-D time domain to a 2-D time-frequency domain and then denoising the signal by a designed filter and finally transforming back the filtered signal to original time domain. ...
In this article a texture feature extraction scheme based on M-band wavelet packet frames is investigated. The features so extracted are used for segmentation of satellite images which usually have complex and overlapping boundaries. The underlying principle is based on the fact that different image regions exhibit different textures. Since most signifcant information of a texture often lies in...
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