Results 261 to 270 of about 89,842 (301)

Instantaneous frequency and the conditional mean frequency of a signal

Signal Processing, 1997
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Patrick J. Loughlin, Berkant Tacer
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Instantaneous frequency and time-frequency distributions

IEEE International Symposium on Circuits and Systems, 2003
A discussion of instantaneous frequency from the point of view of joint time-frequency distributions is presented. From this perspective, instantaneous frequency is the average frequency at a particular time. This view forces the consideration of the standard deviation of instantaneous frequency at a given time.
L. Cohen, C. Lee
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Microprocessor-based instantaneous frequency meter

Electroencephalography and Clinical Neurophysiology, 1981
Abstract An instantaneous frequency meter employing a 6502 microprocessor (Rockwell AIM 65) is described. it features low cost, linearity, and flexibility, allowing software control of sensitivity.
S, Iscoe, R A, Young
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Instantaneous frequency: Discussion

The Leading Edge, 1992
In Properties of instantaneous seismic attributes (July 1991 TLE), R.E. White shows graphically the instantaneous frequency can be negative. This property of the instantaneous frequency is very interesting, especially when we keep in mind the fact that an analytic signal associated with a real signal contains no negative-frequency components.
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Interpretation of Instantaneous Frequencies

American Journal of Physics, 1974
The relation between instantaneous frequencies and Fourier components of a time-dependent signal is examined. Examples are given in which large excursions of the instantaneous frequency do not correspond to any Fourier components, and in which Fourier components are not manifest in the instantaneous frequencies.
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Multiple motions from instantaneous frequency

Proceedings 1992 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2003
The measurement of multiple velocities using phase-based methods is discussed. In particular, phase gradients (instantaneous frequency) from different bandpass channels (quadrature filter outputs) are used to estimate multiple image velocities in a single neighborhood. The approach is similar to that of M. Shizawa and K.
Keith Langley, David J. Fleet, Tim J. Atherton   +2 more
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Instantaneous frequency spectra

The Leading Edge, 2015
Abstract The goal of performing spectral decomposition is to determine the frequency spectra of the seismic signal as a function of traveltime. In conventional short-window Fourier methods and in continuous-wavelet transforms, there is a trade-off between temporal resolution and frequency resolution.
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Speaker Identification Using Instantaneous Frequencies

IEEE Transactions on Audio, Speech, and Language Processing, 2008
This paper presents an experimental evaluation of different features for use in speaker identification. The features are tested using speech data provided by the chains corpus, in a closed-set speaker identification task. The main objective of the paper is to present a novel parametrization of speech that is based on the AM-FM representation of the ...
Marco Grimaldi, Fred Cummins
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Algorithmic Measurement of Digital Instantaneous Frequency

IEEE Transactions on Communications, 1976
This paper presents an algorithmic method for measuring the instantaneous frequency of a uniformly sampled FM signal. The measured parameter, termed digital instantaneous frequency, is defined in a manner similar to that used to describe frequency-modulated, continuous-time signals.
Hussein S. El-Ghoroury, Someshwar C. Gupta   +1 more
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Instantaneous frequency: Reply

The Leading Edge, 1992
Phasors or formulas? In this article, I used a phasor representation to indicate why the instantaneous frequency of a seismic trace can be negative and why it can be unstable when the amplitude envelope is small. The equivalent algebraic representation of the analytic signal is well known and some may prefer it, but I considered that phasors gave the ...
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