Results 21 to 30 of about 3,095,615 (291)
Evaluation of internal boundary surface using instantaneous frequency of ultrasonic pulse
Nihon Kikai Gakkai ronbunshu, 2015 An evaluation technique of internal boundary surface using instantaneous frequency of ultrasonic pulse is proposed. The instantaneous frequency represents a variation of the frequency of the ultrasonic pulse waveform from moment to moment. In this paper,
Takumi INOUE +2 more
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An instantaneous frequency analysis method of stay cables
Journal of Low Frequency Noise, Vibration and Active Control, 2021 This paper presents and evaluates in detail a conjugate-pair decomposition method for tracking the instantaneous frequency of a vibration signal by processing only three (or more) most recent data points, and Probability Box theory was employed to obtain
Rumian Zhong, P Frank Pai
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Wideband High-Speed and High-Accuracy Instantaneous Frequency Measurement System
IEEE Photonics Journal, 2023 A new photonic-assisted instantaneous frequency measurement system is presented. It overcomes the latency problem in the reported structures based on the frequency-to-time mapping technique or the frequency-to-power mapping technique that involves a long
Chongjia Huang +3 more
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Novel multivariate methods to track frequency shifts of neural oscillations in EEG/MEG recordings
NeuroImage, 2023 Instantaneous and peak frequency changes in neural oscillations have been linked to many perceptual, motor, and cognitive processes. Yet, the majority of such studies have been performed in sensor space and only occasionally in source space. Furthermore,
C. Vidaurre +7 more
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A new technique for instantaneous frequency rate estimation [PDF]
, 2002 This letter introduces a two-dimensional bilinear mapping operator referred to as the cubic phase (CP) function. For first-, second-, or third-order polynomial phase signals, the energy of the CP function is concentrated along the frequency rate law of ...
O'Shea, Peter J.
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Ideal instantaneous frequency.
, 2022 Ideal instantaneous frequency.
Xingcheng Han (9565324) +3 more
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Instantaneous Frequency Representation Used for CPA Laser Simulation
Applied Sciences, 2021 In the current study, we present a novel intuitive graphical method for the simulation of nonlinear effects on stretched pulses, characterized by a large time-bandwidth product.
Thomas Oksenhendler +2 more
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Advances in Mechanical Engineering, 2023 Mechanical equipment often works on variable speed condition, its corresponding vibration signal presents multi-component, modulation coupling with fast time-varying instantaneous frequency (IF), how to effectively compute IF and realize fasting varying ...
Lu Yan +7 more
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Adaptive noise cancelling and time–frequency techniques for rail surface defect detection [PDF]
, 2015 Adaptive noise cancelling (ANC) is a technique which is very effective to remove additive noises from the contaminated signals. It has been widely used in the fields of telecommunication, radar and sonar signal processing.
Liang, B. +11 more
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Adaptive Window Zero-Crossing-Based Instantaneous Frequency Estimation
EURASIP Journal on Advances in Signal Processing, 2004 We address the problem of estimating instantaneous frequency (IF) of a real-valued constant amplitude time-varying sinusoid. Estimation of polynomial IF is formulated using the zero-crossings of the signal.
Sekhar S Chandra, Sreenivas TV
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