Results 11 to 20 of about 37,206,520 (227)

THE TIME AND FREQUENCY CONTROL SUBSYSTEM ONBOARD NAVSTAR/GPS

open access: yes, 1984
International Telemetering Conference Proceedings / October 22-25, 1984 / Riviera Hotel, Las Vegas, NevadaThe commitment of the Global Positioning System (GPS) to use atomic clocks dates back more than ten years ago when the first major contractual ...
Hellwig, Helmut, Levine, Martin W.
core   +5 more sources

Time-Frequency Analysis of Systems with Changing Dynamic Properties [PDF]

open access: yes, 2006
The Wigner-Ville Distribution, and related refinements, represent a class of advanced time-frequency analysis tools that are distinguished from Fourier and wavelet methods by an increase in resolution in the time frequency plane. Time-frequency analysis
Bradford, Samuel Case, V   +1 more
core   +1 more source

Neural Oscillation Associated with Contagious Itch in Patients with Atopic Dermatitis

open access: yesBrain Sciences, 2021
Objective: Itch is an unpleasant sensation associated with an urge to scratch and is a major health care issue associated with atopic dermatitis (AD). Contagious itch, i.e., subjective feelings of itchiness induced by watching others’ scratching behavior,
In-Seon Lee   +6 more
doaj   +1 more source

Borneo Lute ‘Sape’: The Frequency Spectrum and Time Frequency Analysis (TFA)

open access: yesBioResources, 2023
Sound elements were studied for a six strings sape, a traditional instrument. The frequency was evaluated using a frequency spectrum and a time frequency plane. PicoScope oscilloscopes and Adobe Audition version 3 were used to record the acoustic spectra.
Sinin Hamdan   +4 more
doaj   +2 more sources

A Time–Frequency Analysis Perspective on Feynman Path Integrals

open access: yes, 2020
The purpose of this expository paper is to highlight the starring role of techniques from time–frequency analysis in some recent contributions concerning the mathematical theory of Feynman path integrals.
S. Ivan Trapasso, Trapasso S. I.
core   +1 more source

Feature Extraction Methods for Electroretinogram Signal Analysis: A Review

open access: yesIEEE Access, 2021
Feature extraction is an essential aspect of electroretinogram (ERG) signal analysis. The extracted features are beneficial to analyze the signal further and compress the signal for storage or transmission purposes.
Soroor Behbahani   +2 more
doaj   +1 more source

Time-frequency methods for non-stationary statistical signal processing

open access: yes, 2008
Time-frequency (TF) methods can be used to analyze and process non-stationary random processes in an efficient and intuitive manner. This chapter presents some of the non-parametric methods in this area.
Matz, Gerald, Hlawatsch, Franz
core   +4 more sources

Railway wheel-flat and rail surface defect modelling and analysis by time–frequency techniques [PDF]

open access: yes, 2013
Damage to the surface of railway wheels and rails commonly occurs in most railways. If not detected, it can result in rapid deterioration and possible failure of rolling stock and infrastructure components causing higher maintenance costs.
Liang, B.   +7 more
core   +1 more source

Time-frequency statistical characteristics of cyclostationary signals [PDF]

open access: yes, 1998
Time-frequency statistical characteristics of cyclostationary signals are studied. The characteristics considered are real and complex instantaneous autospectra.
Vokurka, Karel
core   +1 more source

Harmonic analysis of AC-bus voltage in converter station based on time–frequency transformation

open access: yesThe Journal of Engineering, 2018
The disturbance of the AC system has become one of the main causes of commutation failure in the high voltage direct current (HVDC) transmission system. Here, the time–frequency transformation method is used to analyse the AC-bus voltage disturbance from
Zhao Dandan   +6 more
doaj   +1 more source

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