نتایج جستجو برای: digital instantaneous frequency

تعداد نتایج: 789354  

1998
J. Redi P. Bahl

There is hardly a more pervasive trend in the world today than communications. The momentum towards anytime, anywhere and any-type of communication is fueled by advances in radio frequency technology, near-exponential sales of laptop computers and personal digital assistants (PDAs), as well as new models of business that expect and rely on instantaneous information availability. The commonly ro...

2012
Sean R. Ford Edward J. Garnero Michael S. Thorne

S U M M A R Y We infer shear attenuation in the lower mantle by using the method of instantaneous frequency matching to calculate differential t∗ between core-reflected ScS and direct S (δt∗ScS−S). The instantaneous frequency at the envelope peak of a seismic phase is related to the average Fourier spectral frequency of that phase. To estimate δt∗ScS−S for a given trace, we first calculate the ...

2013
MINGWEI QIN XIANGLU LI YUANCHENG YAO

Automatic modulation identification plays an important role in non-cooperative communication systems. An improved approach, based on instantaneous features and binary tree classifier has been proposed for the classification of Medium Frequency (IF) digital signals at low signal-to-noise ratio (SNR) situation. Mean filter was applied to suppress the noise and five new characteristic parameters s...

Journal: :Journal of Geophysics and Engineering 2018

Journal: :J. Electronic Imaging 2005
Monica Borda Ioan Nafornita Dorina Isar Alexandru Isar

The aim of this paper is to present a new method for the estimation of the instantaneous frequency of a frequency modulated signal, corrupted by additive noise. Any time-frequency representation of an acquired signal is concentrated around the instantaneous frequency law of its useful component (the projection of the ridges of the time-frequency representation on the time-frequency plane) and r...

Journal: :IEEE Transactions on Audio, Speech, and Language Processing 2009

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